RBI FUTERA II Series User manual

FTII-IOM-8
82-0253
Finned copper tube
Gas boilers (FB) &
Water heaters (FW)
Copyright 2010 Mestek, Inc.
260 North Elm Street 7555 Tranmere Drive
Westfield, MA 01085 Mississauga, ONT. L5S IL4 Canada
Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
www.rbiwaterheaters.com
is manual is intended only for use by a qualied heating installer/technician. Read and follow this manual, all supplements and related
instructional information provided with the boiler. Install, start and service the boiler only in the sequence and methods given in these
instructions. Failure to do so can result in severe personal injury, death or substantial property damage.
Do not use the boiler during construction. Construction dust and particulate, particularly drywall dust, will cause contamination of
the burner, resulting in possible severe personal injury, death or substantial property damage. e boiler can only be operated with a dust-
free air supply. Follow the instruction manual procedures to duct air to the boiler air intake. If the boiler has been contaminated by operation
with contaminated air, follow the instruction manual guidelines to clean, repair or replace the boiler if necessary.
Ax these instructions near to the boiler/water heater. Instruct the building owner to retain the instructions for future use by a qualied
service technician, and to follow all guidelines in the User’s Information Manual.
Boiler manual
Installation and
operation instructions

2
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
CONTENTS
BEFOREYOUR START . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
RATINGS & CAPACITIES . . . . . . . . . . . . . . . . . . . . . . . . . . 3
BOILER/WATER HEATER LOCATION . . . . . . . . . . . . . . . 3
COMBUSTION AIR & VENTILATION . . . . . . . . . . . . . . . . . 3
GENERAL VENTING GUIDELINES . . . . . . . . . . . . . . . . . 5
OUTDOOR VENTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
COMMON VENT SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . 14
GENERAL PIPING REQUIREMENTS . . . . . . . . . . . . . . 14
HEATING SYSTEM PIPING . . . . . . . . . . . . . . . . . . . . . . . 16
DOMESTIC WATER SUPPLY PIPING . . . . . . . . . . . . . . 20
GAS SUPPLY PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
ELECTRICAL WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
GENERAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 25
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . 25
CHECKING & ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . 27
CONTROL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 29
DIAGNOSTICSPAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
TROUBLE-SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
REPAIR PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
START UP SHEET. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
MASS CODE PAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
BEFOREYOU START
This manual covers the application, installation, operation
and maintenance of a Futera II Series finned copper
heating boiler/water heater/pool heater.
To obtain the safe, dependable, efficient operation and long
life for which this heating boiler/water heater was designed,
these instructions must be read, understood and followed.
The Futera II Series finned copper heating boiler/water
heaters have been design certified by CSA for use with
natural and propane gas under the latest revision of
ANSI-Z21.10.3/CSA 4.3, Gas Water Heaters, ANSI-Z21.13/
CSA 4.9, Gas-Fired Low Pressure Steam and Hot Water
Boilers ANSI-Z21.56/CSA 4.7 Gas Fired Pool Heaters and
CAN1-3.1, Industrial and Commercial Gas Fired Packaged
Boilers.Each unit has been constructed and hydrostatically
tested for a maximum working pressure of 160 psi,
1103 kPa in accordance with Section IV of the A.S.M.E.
Boiler and Pressure Vessel Code.
All aspects of the boiler/water heater installation must
conform to the requirements of the authority having juris-
diction, or, in the absence of such requirements, to the
National Fuel Gas Code, ANSI Z223.1/NFPA 54-latest
revision.Where required by the authority having jurisdiction,
the installation must conform to the Standard for Controls
and Safety Devices for Automatically Fired Boilers, ANSI/
ASME CSD-1.
In Canada, the installation must be in accordance with the
requirements of CSA B149.1 or .2, Installation Code for
Gas Burning Appliances and Equipment.
If installed in the Commonwealth of Massachusetts, you
MUST FOLLOW the additional instructions located in the
back of this manual (MACODE-3).
The owner should maintain a record of all service work
performed with the date and a description of the work done.
Include the name of the service organization for future
reference.
Direct all questions to your RBI distributor or contact the
RBI Customer Service Department at:
U.S. —
260 North Elm Street
Westfield, MA 01085
Canada —
7555 Tranmere Drive
Mississauga ONT L5S 1L4
Always include the model and serial numbers from the
rating plate of the boiler/water heater in question.

3
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
RATINGS & CAPACITIES
Before undertaking the installation of the Futera II Series
boiler/water heater check the rating plate to ensure that the
unit has been sized properly for the job. The “Net I=B=R
Ratings” specify the equivalent amount of direct copper
radiation that the unit can supply under normal conditions.
Also ensure that the unit has been set up for the type of
gas available at the installation site. Other important
considerations are the availability of an adequate electrical
supply, fresh air for combustion and a suitable chimney or
vent system.
BOILER/WATER HEATER LOCATION
1. This boiler/water heater is suitable for indoor and
outdoor installations. Locate the boiler/water heater in
an area that provides good access to the unit.Servicing
may require the removal of jacket panels. Allow the
minimum clearances between adjacent construction
and the boiler/water heater as listed in Table 1.
NOTE: Service clearances are not mandatory, but are
recommended to ensure ease of service should it be
required.
Table 1
Clearance to Service
Combustibles Clearance
in mm in mm
Top 24 610 30 762
Back 14 356 24 610
Left Side 6153 12 306
Right Side 6153 12 306
Front 8203 30 762
2. An optimum site will be level, central to the piping
system, close to a chimney or outside wall and have
adequate fresh air for combustion. Ensure that the
boiler/water heater is level from front to back and from
side to side. Use metal shims to level the boiler/water
heater.Electrical and electronic components must also
be protected from exposure to water during operation
and maintenance. DO NOT install this boiler/water
heater in a location that would subject any of the gas
ignition components to direct contact with water or
excessive moisture during operation or servicing.
3. Ensure that the floor is structurally sound and will
support the weight of the boiler/water heater.
NOTE: The Futera II may be installed directly on
combustible flooring, but never on carpeting.
4. Locate the boiler/water heater in an area that will
prevent water damage to adjacent construction should
a leak occur or during routine maintenance. If such a
location doesn’t exist, a suitable drain pan that’s
adequately drained must be installed under the unit.
5. DO NOT place this boiler/water heater in a location that
would restrict the introduction of combustion air into
the unit or subject it to a negative pressure, see
“GENERAL VENTING GUIDELINES”.
6. NEVER place this boiler/water heater in a location that
would subject it to temperatures at or near freezing.
See the “Freeze Protection” section on page 15.
CAUTION: Units installed outdoors MUST be protected
from ice and snow accumulation or the unit will be
damaged voiding the warranty!
WARNING: Never store combustible materials,
gasoline or any product containing flammable
vapors or liquids in the vicinity of the boiler/water
heater. Failure to comply with this warning can
result in an explosion or fire causing extensive
property damage, severe personal injury or death!
COMBUSTION AIR &VENTILATION
WARNING: This boiler/water heater must be
supplied with combustion air in accordance with
Section 5.3, Air for Combustion &Ventilation, of the
latest revision of the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and all applicable local building
codes. Canadian installations must comply with
CAN/ CGA B149.1 or .2 Installation Code for Gas
Burning Appliances and Equipment, or applicable
provisions of the local building codes. Failure to
provide adequate combustion air for this boiler/
water heater can result in excessive levels of
carbon monoxide which can result in severe
personal injury or death!
To operate properly and safely this boiler/water heater
requires a continuous supply of air for combustion.NEVER
store objects on or around the boiler/water heater!
CAUTION: Combustion air contaminated with
fluorocarbons or other halogenated compounds such
as cleaning solvents and refrigerants will result in the
formation of acids in the combustion chamber. These
acids will cause premature failure of the boiler/water
heater voiding the warranty!
CAUTION: If the boiler/water heater is operated while
the building is under construction it MUST be
protected from wood, concrete, sheet rock and other
types of dust. Failure to properly protect the unit from
construction dust will damage the unit voiding the
warranty!
Buildings will require the installation of a fresh air duct or
other means of providing make-up air if the intake air option
isn’t used. Any building utilizing other gas burning
appliances, a fireplace, wood stove or any type of exhaust
fan must be checked for adequate combustion air when all
of these devices are in operation at one time. Sizing of an
outside air duct must be done to meet the requirements
of all such devices.

4
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
WARNING: Never operate the Futera II in an
environment subjected to a negative pressure
unless it is Direct Vented. Failure to comply with
this warning can result in excessive levels of
carbon monoxide causing severe personal injury
or death!
All Air From InsideThe Building
If the Futera II is to be located in a confined space, the
minimum clearances listed in Table 1 must be maintained
between it and any combustible construction. When
installed in a confined space without the intake air
option, Figures 7, 8 and 9, two permanent openings
communicating with an additional room(s) are required.The
combined volume of these spaces must have sufficient
volume to meet the criteria for an unconfined space. The
total air requirements of all gas utilization equipment,
fireplaces, wood stoves or any type of exhaust fan must
be considered when making this determination. Each
opening must have a minimum free area of 1 in2/1000 Btu/
hr, 2200 mm2/kW based on the total input rating of ALL
gas utilization equipment in the confined area. Each
opening must be no less than 100 in2, 64,516 mm2in size.
The upper opening must be within 12 in, 305 mm of, but
not less than 3 in, 76 mm from, the top of the enclosure.
The bottom opening must be within 12 in, 305 mm of, but
not less than 3 in, 76 mm from, the bottom of the
enclosure.
All Air From OutsideThe Building
When installed in a confined space without utilizing the
intake air option two permanent openings communicating
directly with, or by ducts to, the outdoors or spaces that
freely communicate with the outdoors must be present.The
upper opening must be within 12 in, 305 mm of, but not
less than 3 in, 76 mm from, the top of the enclosure.The
bottom opening must be within 12 in, 305 mm of, but not
less than 3 in, 76 mm from, the bottom of the enclosure.
Where directly communicating with the outdoors
or communicating with the outdoors through vertical
ducts, each opening shall have a minimum free area of
1 in2/4000 Btu/hr, 550 mm2/kW of the total input rating
of all of the equipment in the enclosure.
Where communicating with the outdoors through horizontal
ducts, each opening shall have a minimum free area of
1 in2/2000 Btu/hr, 1100 mm2/kW of the total input rating
of all of the equipment in the enclosure.
When ducts are used, they must have the same cross-
sectional area as the free area of the opening to which
they connect.
When calculating the free area necessary to meet the
make-up air requirements of the enclosure, consideration
must be given to the blockage effects of louvers, grills and
screens. Screens must have a minimum mesh size of
1/4 in, 6.4 mm. If the free area through a louver or grill is
not known, ducts should be sized per Table 2.
Table 2 – Make-up Air Louver Sizing
Required Cross Sectional Area
Input 1/4 in 6.4 mm
75% Free Area 25% Free Area
(MBH) Wire Screen Metal Louvers Wooden Louvers
in2cm2 in2cm2 in2cm2
500 125 806 167 1077 500 3226
750 187 1206 250 1613 750 4839
1000 250 1613 333 2148 1000 6452
1250 313 2019 416 2684 1250 8065
1500 375 2419 500 3226 1500 9677
1750 437 2819 583 3761 1750 11,290
1950 486 3135 649 4187 1950 12,580
Canadian installations must comply with CSA B149.1 when
air supply is provided by natural air flow from the outdoors
for natural draft, partial fan-assisted, fan-assisted, or
power draft-assisted burners, there shall be a permanent
air supply opening(s) having a cross-sectional area of not
less than 1 in2per 7,000 Btuh (310 mm2per kW) up to
and including 1 million Btuh, plus 1 in2per 14,000 Btuh
(155 mm2per kW) in excess of 1 million Btuh.
Intake Air Option – General Guidelines
This configuration provides combustion air directly to the
boiler/water heater’s air intake using a dedicated pipe when
using the direct vent option. The RBI air intake adapter
must be fitted to the blower inlet. Combustion air can be
drawn in horizontally through the same outside wall which
terminates the exhaust gases or vertically through the roof,
see Figures 2, 3, 4, 5 & 6.
WARNING: Common intake air systems may be
used provided the common duct is sized properly
and an intake combustion air damper is installed
in the intake air pipe of each heater. Improper
installation can result in excessive levels of carbon
monoxide which can cause severe personal injury
or death!
All joints in metal intake air systems must be secured using
corrosion resistant fasteners and sealed using a suitable
Silicone caulk. If PVC or CPVC is used, the joints must be
cleaned with a suitable solvent and connected using a
solvent based PVC cement.The combustion air system
MUST be supported by the building structure not the
boiler/water heater.
CAUTION: A combustion air damper interlocked with
the unit should be installed in the intake air pipe when
the infiltration of subfreezing air could occur, otherwise
the unit could freeze up voiding the warranty!
Intake Air Option –Vertical Guidelines
The maximum equivalent length for the vertical intake air
pipe is 60 ft, 18.3 m. Each 90˚ elbow and the intake air
terminal are equal to 10 linear ft, 3.1 m of pipe.
An approved, nonrestrictive intake air terminal must be
used. The intake air terminal must terminate as shown in
Figure 5.The penetration point in the roof must be properly
flashed and sealed.

5
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
VENT SYSTEM OPTIONS
The Futera II may be vented the following ways:
1) Direct Vent, Positive Pressure, Category III uses a
vent system certified to UL 1738 for installations in the
United States, ULC S636 for installations in Canada.
Combustion air is piped from the outdoors to the
blower inlet.
2) SideWallVent, Positive Pressure, Category III uses
a vent system certified to UL 1738 for installations in the
United States, ULC S636 for installations in Canada.
Combustion air is obtained from the space in which
the unit is installed.
3) Horizontal Vent, Negative Pressure, Category I
for horizontal vent runs equivalent to more than 60
ft, 18.3 m (90 degree elbow = 10 equivalent feet), a
dedicated wall mounted power venter must be used.
The vent system can be single wall galvanized steel or
type B vent pipe. Combustion air is obtained from the
spacein whichthe unit isinstalled orfrom theoutdoors.
A barometric damper must be installed when the
horzontal run is longer than 60 equivalent feet (90
degree elbow = 10 equivalent feet).If this is the case, a
power venter must also be used.
If horizontal run is less than 60 equivalent feet, do not
usea barometricdamper.Followapplicableinstructions
under the “DIRECT VENT, POSITIVE PRESSURE”
section, page 6.
4) Vertical/Chimney Vent, Negative Pressure,
Category I uses an approved metal chimney system
or masonry chimney. Combustion air is obtained from
the space in which the unit is installed. A barometric
damper must be installed near the flue outlet when
venting vertically.
5) Outdoor Installation uses the outdoor option kit.
Barometric damper is not required.
NOTE: All venting, combustion air material supplied by
installer.
Intake Air Option – Horizontal Guidelines
The maximum equivalent length for the horizontal
combustion air pipe on installations that used the Direct
Vent optionis 60 ft,18.3m.The maximumequivalentlength
for the horizontal combustion air pipe on installations that
usethe HorizontalPowerVent optionis 100 ft, 30.5m.Each
90° elbow and the combustion air terminal are equal to 10
linear ft, 3.1 mof pipe.If horizontal runs exceed 5 ft, 1.5 m
theymustbe supportedat 3 ft,0.9m intervalswithoverhead
hangers.ThecertifiedcombustionairterminalfromRBImust
be used and installed as shown in Figures 3 and 4.
GENERALVENTING GUIDELINES
WARNING: The vent installation must be in
accordance with Part 7, Venting of Equipment, of
the National Fuel Gas Code, ANSI Z223.1/NFPA 54-
latest revision or applicable provisions of the local
building codes. Canadian installations must
comply with CAN/CGA B149.1 or .2 Installation
Code. Improper venting can result in excessive
levels of carbon monoxide which can result in
severe personal injury or death!
All vent systems must be fully supported by the building
structure and not by the boiler/water heater. Appropriate
thimbles and fire-stops must be used where required.
WARNING: Common vent systems must be
properly engineered and sized to provide a
negative draft of 0.01 to 0.08 in, 0.25 to 2.0 mmW.C.
at the flue outlet. Common positive pressure vent
systems are not to be used. Improper installation
can result in excessive levels of carbon monoxide,
which can cause severe personal injury or death!
NOTE: A single acting barometric damper must be
installed directly to the boiler/water heater flue outlet, if
required.This does not apply to outdoor units or direct
vent positive pressure units.
NOTE: Some venting applications may require the stop
to be removed for smooth operation.The barometric
damper should be located after the flue collector, refer
to Figures 2, 7A and 8 for proper location. Be sure that
the damper is mounted horizontally (never vertically).
Carefully follow the instructions provided with the
barometric damper.
In Canada, B149 (7.25 Draft Regulators) states the
damper shall be of double-acting type.
WARNING: To avoid spillage into the room of
dangerous flue gas containing carbon monoxide,
the opening in damper must never face against the
flow of flue gas.

6
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
DIRECTVENT,
POSITIVE PRESSURE, CATEGORY III
In this configuration the boiler/water heater blower is used
to push the flue products to the outdoors while drawing
combustion air from the outdoors. The equivalent length
of the vent system must not exceed 60 ft., 18.3 m. The
Intake Air Option instructions under the “COMBUSTION
AIR & VENTILATION” section must be followed! The vent
system must be sized per Figure 2, Outlet Sizes.
Horizontal DirectVent Systems – Figures 3 & 4
The vent materials used in horizontal vent systems must
be certified to UL 1738 for installations in the United States,
ULC S636 for installations in Canada. The certified vent
terminal from RBI must also be used.
The maximum equivalent length for the horizontal vent
pipe is 60 ft,18.3 m.Each 90˚ elbow and the vent terminal
are equal to 10 linear ft, 3.1 m of pipe. If any part of a
single wall metal vent system passes through an unheated
space, it must be insulated with insulation rated for
400°F, 204°C. Structural penetrations must be made using
approved fire-stops. For best results, horizontal vent
systems should be as short and straight as possible.
The vent system must be both gas tight and watertight. All
seams and joints in metal pipes must be joined and sealed
in accordance with the vent system manufacturer’s
instructions.
When horizontal vent runs exceed 5 ft, 1.5 m they must be
supported at 3 ft, 0.9 m intervals with overhead hangers.
The vent system must be pitched down, toward the vent
terminal, 1/4 in/ft, 20 mm/m. If any part of a single wall metal
vent system passes through an unheated space it must be
insulated with insulation rated for 400˚F, 204°C.
Horizontal vent systems shall terminate at least 4 ft,
1.2 m below, 4 ft, 1.2 m horizontally from or 1 ft,
0.30 m above any door, window or gravity air inlet into
any building. It must not terminate less than 4 ft, 1.2 m
horizontally from, and in no case above or below, unless
a 4 ft, 1.2 m horizontal distance is maintained, from electric
meters, gas meters, regulators and relief equipment and
not less than 7 ft, 2.1 m from any adjacent public walkway.
The bottom of the vent terminal(s) shall be located at
least 5 ft, 1.5 m above the air intake terminal(s) unless
there is a minimum 5 ft, 1.5 m horizontal separation
between them.Avoid terminal locations likely to be affected
by winds, snowdrifts, people and pets. Protect building
materials and vegetation from degradation caused by the
flue gases.
Vertical DirectVent Systems – Figure 5
The maximum equivalent length for the vertical pipe is
60 ft, 18.3 m. Each 90˚ elbow and the vent terminal are
equal to 10 linear ft, 3.1 m of pipe. If any part of a single
wall metal vent system passes through an unheated space,
it must be insulated with insulation rated for 400˚F, 204°C.
Structural penetrations must be made using approved fire-
stops.
An approved nonrestrictive intake air teminal must be
used.The top of a vertical vent system must extend at least
51/2ft,1.7 m above the roof surface and maximum snow
line that it passes through, 4 ft, 1.2 m above the intake air
terminal, see Figure 5.
In addition the vent system must conform to the dimensions
shown in Figure 5. The penetration point in the roof must
be properly flashed and sealed.
The vent system must be gas tight. All seams and joints
in metal pipes must be joined and sealed in accordance
with the vent system manufacturer’s instructions.
Combination DirectVent Systems – Figure 6
The boiler/water heater can be vented vertically with the
intake air piped horizontally through an outside wall. Follow
the instructions in the Intake Air Option – Horizontal
Guidelines on page 5. Also follow the general instructions
in the “COMBUSTION AIR & VENTILATION” and
“GENERAL VENTING GUIDELINES” sections.

7
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
Figure 1 - Air IntakeVertical orThruWall
Figure 2 -VentingThru Wall/Vertical

8
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
Figure 3 – Horizontal Air Intake and Venting for a Single DirectVent System
Figure 4 – Horizontal Air Intake and Venting for Multiple DirectVent Systems
WARNING: When running horizontal
combustion air and venting for single or
multiple units, exhaust and combustion air
terminals must be installed on the same
plane (outside wall) in order to prevent
pressure differences due to prevailing
winds. In cold climates, double-wall or
insulated inlet pipe recommended to
prevent condensation.

9
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
Figure 5 -Vertical Air Intake and Venting for DirectVent System
Figure 6 – Combination Direct Vent Systems
10 FT 3.1 m
4 FT
1.2 m
5 FT
1.5 m
1.5 FT
0.5 m
5 1/2 FT
1.7 m
1.5 FT. .5 m
10 FT. 3.1 m
3 FT. 1 m

10
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
SIDEWALL VENT,
POSITIVE PRESSURE, CATEGORY III
In this configuration the boiler/water heater blower is used
to push the flue products horizontally to the outdoors, see
Figure 7. The air for combustion is taken from the space
in which the unit is installed. The applicable instructions
under the “COMBUSTION AIR & VENTILATION” section
must be followed! The vent guidelines under the Horizontal
Direct Vent Systems section must also be followed.
HORIZONTAL VENT,
NEGATIVE PRESSURE, CATEGORY I
In this configuration a wall-mounted power venter must be
used to pull the flue products horizontally from the unit and
vent them to the outdoors, see Figures 3, 4 & 7A.The air
for combustion is taken from the space in which the unit is
installed, or from the outdoors.The applicable instructions
under the “COMBUSTION AIR & VENTILATION” section
must be followed!
To maximize the performance of single wall sheet metal
vent systems locate 90˚ elbows as far from the boiler as
possible and from one another. For best results, horizontal
vent systems should be as short and straight as possible.
When horizontal vent runs exceed 5 ft, 1.5 m they
must be supported at 3 ft, 0.9 m intervals with overhead
hangers. The vent system must be pitched down, toward
the vent terminal, 1/4 in/ft, 21 mm/m.If any part of a single
wall metal vent system passes through an unheated space
it must be insulated with insulation rated for 400˚F, 204˚C.
Horizontal vent systems shall terminate at least 4 ft,
1.2 m below, 4 ft, 1.2 m horizontally from or 1 ft,
0.30 m above any door, window or gravity air inlet
into any building. It must not terminate less than
4 ft, 1.2 m horizontally from, and in no case above
or below, unless a 4 ft, 1.2 m horizontal distance
is maintained, from electric meters, gas meters, regulators
and relief equipment and not less than 7 ft, 2.1 m from
any adjacent public walkway.The bottom of the vent
terminal(s) shall be located at least 5 ft, 1.5 m above
the air intake terminal(s) unless there is a minimum 5 ft,
1.5 m horizontal separation between them. Avoid terminal
locations likely to be affected by winds, snowdrifts, people
and pets. Protect building materials and vegetation from
degradation caused by the flue gases.
To determine the appropriate power venter for the
boiler/water heater, see Table 3. Follow the power venter
manufacturer’s installation instructions.
Table 3 - PowerVenter Sizes
VERTICAL/CHIMNEYVENT,
NEGATIVE PRESSURE, CATEGORY I
The Futera II is listed as a Category I appliance when
vented vertically into a listed metal chimney system or
properly sized masonry chimney, Figures 8 & 9. The
chimney must provide a negative pressure of 0.01 to 0.08
in, 0.25 to 2.0 mm W.C.at the boiler/water heater flue collar
with the unit running. A barometric damper must be
attached directly to the flue collar increaser as shown.
Multiple Futera II’s can be vented into a single vertical
chimney provided that the breeching and chimney are
properly sized per the latest revision of the National Fuel
Gas Code, ANSI Z223.1.
When more than one appliance is connected to the same
chimney flue, the flue must be large enough to safely vent
the combined output of all of the appliances.
WARNING: If an appliance using any type of a
mechanical draft system operating under positive
pressure is connected to a chimney flue, never
connect any other appliances to this flue. Doing
so can result in excessive levels of carbon
monoxide which can cause severe personal injury
or death!
Chimney Inspection & Sizing
A thorough inspection of the masonry chimney must be
performed to ensure that the chimney is clean, properly
constructed and properly sized.Exterior masonry chimneys
should not be used unless properly lined to prevent
condensation and draft problems. Table 3A lists the
equivalent breeching and flue sizes required for the boiler/
water heater.
Table 3A - Equivalent Breeching & Chimney Size,
Negative Pressure
Model Size Pipe Diameter
in mm
500 8 203
750, 1000 10 254
1250, 1500 12 305
1750, 1950 14 356
Note:These sizes are based on a 20 ft, 6.1m chimney height.
Vent Connections
Locate the boiler/water heater as close to the chimney as
possible. Use the shortest, straightest vent connector
possible for the installation. If horizontal runs exceed 5 ft,
1.5 m they must be supported at 3 ft,0.9 m intervals with
overhead hangers. Use a type B, single wall stainless or
single wall galvanized steel vent pipe the same diameter
as the flue collar to connect the boiler/water heater to a
masonry chimney, see Figure 2.When using a listed metal
chimney system use the appropriate vent connector.
Futera II Power Venter Max. Pipe Length
Model Model FT m
500 - 750 HS-3 100 31
1000-1250 HS-4 100 31
1500-1950 HS-5 100 31

11
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
Figure 7 – SideWallVenting, Positive Pressure
Figure 7A – PowerVenting, Negative Pressure
The vent connector should be sloped up toward the
chimney at a minimum rate of 1/4 in/ft, 21 mm/m. On
masonry chimneys the connector must terminate flush with
the inside of the chimney flue, Figure 9.Fasten each single
wall vent connection with at least 3 corrosion resistant
sheet metal screws.
Always provide a minimum clearance of 6 in, 152 mm
between single wall vent pipe and any combustible
materials. Type B1 vent may be used, clearance between
it and any combustible material must be as listed.
WARNING: Failure to maintain minimum
clearances between vent connectors and any
combustible material can result in a fire causing
extensive property damage, severe personal injury
or death!
1.5 FT 0.5 m
1/4 IN. PER F00T 20 mm/m
4 FT
1.2 m
3 FT
0.9 m 24"
0.6 m
7 FT
2.1 m
1.5 FT 0.5 m
1/4 IN. PER F00T 20 mm/m
4 FT
1.2 m
24"
0.6 m
3 FT
0.9 m

12
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
Figure 8 –Vertical Venting with a Metal Chimney System

13
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
Figure 10 – OutdoorVenting Figure 11 – Multiple Outdoor Units
Figure 9 –Vertical Venting using a Masonry Chimney
OUTDOORVENTING
When installed outdoors the Futera II must be fitted with
the factory supplied outdoor hood, air intake adapter with
filter. Horizontal discharge tee supplied by others, see
Figure 10. Multiple units must be spaced per Figure 11 to
prevent flue gases from being ingested by adjacent units.
The boiler/water heater must be at least 10 ft, 3.1 m from
any door, window or gravity air inlet into any building and
at least 3 ft, 0.9 m from any overhang unless local codes
dictate differently.
Avoid locations where wind deflection off of adjacent
walls, buildings or shrubbery might cause a downdraft.
The unit(s) should be located at least 3 ft, 0.9 m from
structures. Outdoor installations are not recommended in
areas where the danger of snow blockage exists.
CAUTION: Do not place the boiler/water heater in a
location that would subject it to runoff from adjacent
buildings or damage may occur voiding the warranty!
24"
.6 m

14
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
COMMONVENT SYSTEMS
If an existing boiler/water heater is removed from a
common venting system, the common venting system may
then be too large for the proper venting of the remaining
appliances connected to it. At the time of removal of an
existing boiler/water heater, the following steps shall be
followed with each appliance remaining connected to the
common venting system placed in operation, while the
other appliances remaining connected to the common
venting system are not in operation.
Au moment du retrait d’une chaudière existante, les
mesures suivantes doivent être prises pour chaque
appareil toujours raccordé au système d’évacuation
commun et qui fonctionne alors que d’autres appareils
toujours raccordés au système d’évacuation ne fonction-
nent pas: système d’évacuation
a)
Sealanyunusedopeningsinthecommonventingsystem .
Sceller toutes les ouvertures non utilisées du sys-
tème d’évacuation.
b) Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion and other deficiencies
which could cause an unsafe condition.
Inspecter de façon visuelle le système d’évacu-ation
pour déterminer la grosser et l’inclinaison horizontale
qui conviennent et s’assurer que le système est exempt
d’obstruction, d’étranglement de fruite, de corrosion et
autresdéfaillancesqui pourraientprésenter des risques.
c) Insofar as is practical, close all building doors and
windows and all doors between the space in which the
appliancesremaining connectedto thecommon venting
systemarelocated and otherspacesofthe building.Turn
on clothes dryers and any appliance not connected to the
commonventingsystem.Turn on anyexhaustfans,such
asrangehoodsandbathroomexhaust,sotheywill operate
at maximum speed. Do not operate a summer exhaust
fan for a boiler installation. Close fireplace dampers.
Dans la mesure du possible, fermer toutes les portes
et les fenêtres du bâtiment et toutes les portes entre
l’espace où les appareils toujours raccordés du système
d’évacuation sont installés et les autres espaces du
bâtiment. Mettre en marche les sécheuses, tous les
appareils non raccordés au système d’évacuation
commun et tous les ventilateurs d’extraction comme les
hottes de cuisinère et les ventilateurs des salles de bain.
S’assurer queces ventilateurs fonctionnent à la vitesse
maximale. Ne pas faire fonctionner les ventilateurs
d’été. Fermer les registres des cheminées.
d) Place in operation the appliance being inspected.Follow
the lighting instructions.Adjust thermostat so appliance
will operate continuously.
Mettre l’appareil inspecté en marche. Suivre les
instructions d’allumage. Régler le thermostat de façon
que l’appareil fonctionne de façon continue.
e) Test for spillage at the draft hood relief opening after 5
minutes of main burner operation. Use the flame of a
match or candle, or smoke from a cigarette, cigar or
pipe.
Faire fonctionner le brûleur principal pendant 5 min
ensuite, déterminer si le coupe-tirage déborde à
l’ouverture de décharge. Utiliser la flamme d’une
allunette ou d’une chandelle ou la fumée d’une
cigarette, d’un cigare ou d’une pipe.
h) After it has been determined that each appliance
remaining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers and
any other gas-burning appliance to their previous
condition of use.
Une fois qu’il a été d éterminé, selon la métode
indiquée ci-dessus, que chaque appareil raccordé au
système d’évacuation est mis à l’air libre de façor
adéquate. Remettre les portes et les fenêtres, les
ventilateurs, les registres de cheminées et les appareils
au gaz à leur position originale.
g) Any improper operation of the common venting system
should be corrected so the installation conforms with
the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
When resizing any portion of the common venting
system, the common venting system should be resized
to approach the minimum size as determined using the
appropriate tables in Appendix F in the National Fuel
Gas Code, ANSI Z223.1/ NFPA 54 and or CAN/CGA
B149 Installation Codes.
Tout mauvais fonctionnement du systéme d’évacu-tion
commun devrait étré corrigé de façor que l’installation
soit conforme au National Fue Gas Code, ANSI
Z223.1/NFPA 54 et (ou) aux codes d’installation CAN/
CGA-B149. Si la grosseur d’une section du système
d’ évacuation doit étré modifiée, le système devrait étré
modifié pour respecter les valeurs minimales des
tableaux pertinents de l’appendice F du National Fuel
Gas Code, ANSI Z223.1/ NFPA 54 et (ou) des codes
d’installation CAN/CGA-B149.
GENERAL PIPING REQUIREMENTS
CAUTION: Improper piping of this boiler/water heater
will void the manufacturer’s warranty and can cause
boiler failure resulting in flooding and extensive
property damage! Excessive water hardness causing
scaling in the copper heat exchanger tubes is NOT
covered under the manufacturer’s warranty. Excessive
pitting and erosion of the internal surface of the copper
heat exchanger tubes is NOT covered under the
manufacturer’s warranty if the result of high water flow
rates, seeTable 5. Return water temperatures below
125˚F, 52°C will result in heat exchanger damage from
excessive condensation voiding the manufacturer’s
warranty, see Primary / Secondary Piping,Figure 13.

15
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
NOTE: Shut off valves and unions should be installed
at the inlet and outlet connections of the boiler/hot
water heater to provide for isolation of the unit should
servicing be necessary.
Freeze Protection
This boiler/water heater is CSA designed certified for out-
door installation. Outdoor installations in areas where the
danger of freezing exists are not recommended unless
proper freeze protection is provided. The following
precautions MUST be observed:
1. A continuous flow of water through the unit MUST be
maintained! The pump responsible for flow through the
boiler/water heater must run continuously!
2. An ethylene glycol/water mixture suitable for the
minimum temperature that the unit will be exposed to
must be used.The pump must be capable of producing
a minimum of 15% more flow and overcoming a 20%
increase in head loss.Domestic water systems must be
isolated from the water heater by the use of a heat
exchanger or other approved method.
3. If the unit must be shut off for any reason the electric,
gas and water supplies MUST be shut off and the unit
and its pump completely drained.
Figure 12 – Futera II Piping
CAUTION: Improper outdoor installation of this unit
can cause boiler failure voiding the manufacturer’s
warranty!
ReliefValve
Pipe the discharge of the pressure relief valve as shown
in Figure 12.
WARNING: Never install any type of valve between
the boiler/water heater and the relief valve or an
explosion causing extensive property damage,
severe personal injury or death may occur!
Flow Switch
The flow switch supplied with the boiler/water heater must
be wired to the terminal strip in the control panel to prevent
the boiler from firing unless there’s adequate water flow
through the unit. The flow switch must be installed in the
supply piping adjacent to the boiler outlet connection.
CAUTION: Failure to properly install the flow switch
may result in damage to the boiler/water heater heat
exchanger voiding the warranty!

16
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
HEATING SYSTEM PIPING
General Piping Requirements
All heating system piping must be installed by a qualified
technician in accordance with the latest revision of the
ANSI/ASME Boiler and Pressure Vessel Code, Section IV,
and ANSI/ASME CSD-1, Standard for Controls and Safety
Devices for Automatically Fired Boilers.All applicable local
codes and ordinances must also be followed. A minimum
clearance of 1 in, 25 mm must be maintained between
heating system pipes and all combustible construction. All
heating system piping must be supported by suitable
hangers not the boiler. The thermal expansion of the
system must be considered when supporting the system.
A minimum system pressure of 12 psig, 82.7 kPa must
be maintained.
Heating Boiler Piping Connections
The supply and return connections should be sized to suit
the system, see Table 4.
Table 4 – Supply & Return Pipe Sizing
Model Size Supply Size Return Size
500 thru 1000 2" NPT 2" NPT
1250 thru 1950 2 1/2" NPT 2 1/2" NPT
Pump Requirements
This low mass boiler requires a continuous minimum water
flow for proper operation.The system pump must be sized
to overcome the head loss of the boiler and the heating
system in order to achieve the required temperature rise.
Table 5 provides the heat exchanger pressure drop and
temperature rise figures. The temperature rise across the
boiler must never exceed 35°F, 19.4°C. The adjustable
pump delay turns the pump on each time the burner fires
and runs the pump for 6 to 600 seconds after the call for
heat is satisfied.
CAUTION: A temperature rise outside of the range
listed inTable 5 indicates that the flow rate through
the heat exchanger is incorrect which will damage
the heat exchanger voiding the warranty! The
maximum allowable temperature rise is 35°F,19.4°C.
The maximum allowable flow rate through a Futera II
boiler is 97 GPM, 6.1 L/s on 500 through 1000 models
and 136 GPM, 8.6 L/s for 1250 through 1950 models.
The Cupro-Nickel heat exchanger allows for 108 GPM,
6.8 L/s on 500 through 1000 models and 151 GPM,
9.5 L/s on 1250 through 1950 models.
Table 5 -Temperature Rise Table
ΔT = 20°F ΔT = 11.1°C
Model Flow Rate Pres. Drop Flow Rate Pres. Drop
Number GPM Ft L/s kPa
500 42.5 0.53 2.7 1.5
750 63.8 1.57 4.0 4.6
1000 85.0 3.44 5.4 10.1
1250 106.3 2.11 6.7 6.2
1500 127.5 3.57 8.1 10.5
ΔT = 25°F ΔT = 13.9°C
Model Flow Rate Pres. Drop Flow Rate Pres. Drop
Number GPM Ft L/s kPa
500 34.0 0.35 2.1 1.0
750 51.0 1.04 3.2 3.1
1000 68.0 2.27 4.3 6.7
1250 85.0 1.40 5.4 4.1
1500 102.0 2.36 6.4 7.0
1750 119.0 3.67 7.5 10.8
1950 132.6 5.14 8.4 15.1
ΔT = 30°F ΔT = 16.7°C
Model Flow Rate Pres. Drop Flow Rate Pres. Drop
Number GPM Ft L/s kPa
750 42.5 0.70 2.7 2.2
1000 56.7 1.60 3.6 4.8
1250 70.8 1.00 4.5 2.9
1500 85.0 1.70 5.4 5.0
1750 99.2 2.60 6.3 7.7
1950 110.5 3.70 7.0 10.8
ΔT = 35°F ΔT = 19.4°C
Model Flow Rate Pres. Drop Flow Rate Pres. Drop
Number GPM Ft L/s kPa
750 36.4 0.60 2.3 1.6
1000 48.6 1.20 3.1 3.6
1250 60.7 0.70 3.8 2.2
1500 72.9 1.30 4.6 3.7
1750 85.0 2.00 5.4 5.8
1950 94.7 2.80 6.0 8.1

17
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
LowWater Cutoff
If a boiler is installed above any radiation elements it must
be fitted with a low water cutoff device.
Refer to the wiring diagram supplied with the boiler/water
heater for proper wiring connections.
ExpansionTank & Air Separator
An expansion tank or other means to control thermal
expansion must be installed in the heating system. An
expansion tank must be installed close to the boiler on the
suction side of the pump. An air scoop and automatic air
vent must also be installed to eliminate air trapped in the
system.
Primary/Secondary Piping
Boilers connected to heating systems using zone valves,
zone pumps, or systems that have excessive flow rates or
return water temperatures less than 125˚F, 52˚C must be
isolated from these systems to protect the boiler.
Variable Water Flows
Figure 13 shows a typical primary/secondary piping
system. A dedicated pump is used to maintain a constant
water flow through the boiler.This secondary pump is sized
to overcome the head loss of the boiler and secondary
piping system while supplying the flow rate required to
maintain the desired temperature rise across the boiler.
The primary pump is sized to provide the required flow to
the heating system. The secondary piping connections to
the primary system piping must not be more than 12 in,
305 mm apart to ensure zero pressure drop in the primary
system, see Figure 13.
Low ReturnWaterTemperatures
To prevent the problems associated with condensation of
the products of combustion due to low return water
temperatures a primary/secondary piping system with a
bypass and bypass valve must be installed, see Figure 14.
The bypass and bypass valve must be sized the same as
the secondary piping. A balancing valve must also be
installed in the supply side of the secondary piping
downstream of the bypass.The balancing valve should be
adjusted to divert some of the heated discharge water into
the return water until the required inlet water temperature
is achieved.The primary and secondary pumps should be
sized to provide the required flow through each system.The
secondary piping connections to the primary system piping
must not be more than 12 in, 305 mm apart to ensure zero
pressure drop in the primary system, see Figure 14.
Multiple Boiler Systems
Systems using multiple boilers can also be installed using
a primary/secondary manifold system, Figure 15.
Piping For UseWith Cooling Units
The boiler, when used in connection with a refrigeration
system, must be installed so the chilled medium is piped
in parallel with the boiler. Appropriate valves must be used
to prevent the chilled water from entering the boiler.
When a boiler is connected to a heating coil that may be
exposed to refrigerated air from an air handling device, the
piping system must be equipped with flow-control valves
or some other automatic means of preventing gravity
circulation of the boiler water during the cooling cycle.

18
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
Figure 13 -Typical Boiler Primary/Secondary Piping System
(See Notes)
Figure 14 - LowTemperature Piping with Thermostatic Valve
(See Notes and Adjustment Procedures)
Operated Valve
Air Vent
Pressure Switch
Aquastat Union
Gas Pressure
Regulator
Automatic
Thermometer
Flow Switch
Pressure
Relief Valve
Reducing Valve
Self-Operated
Check Valve
Pressure
Va lv e
Pump
Motorized Valve
Solenoid
Ball Valve
Bufferfly Valve
Angle Valve
Gate Valve
Globe Valve
Balance Valve
Backflow-
Prevention
Device
3-Way Valve
Expansion
Tan k
H-1 Rev 3
NOTES:
1. Boiler circuit piping must be sized
large enough to handle maximum flow
through unit.
2. Boiler pump sized to boiler design flow
requirements.
3. All boilers furnished with factory
mounted outlet water temperature
gauge.
4. Boiler pump purging required.Use
terminals supplied.
Notice:These drawings show suggested
piping configuration and valving.
Check with local codes and ordinances
for specific requirements.
H-18 Rev 2
NOTES:
1. For pump selection consult factory.
2. Boiler pump sized to boiler and thermostatic 3-way valve design flow requirements.
3. Boiler circuit piping must be sized large enough to handle maximum flow through unit.
4. All boilers furnished with factory mounted outlet water temperature gauge.
5. Boiler pump purging required.Use terminals supplied.
6. Valve is precalibrated for 140°F return temperature.
Notice:These drawings show suggested piping configuration and valving.
Check with local codes and ordinances for specific requirements.

19
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
Figure 15 - Multiple Boiler Piping (See Notes)
Figure 14A - LowTemperature Boiler Piping
(See Notes and Adjustment Procedures)
Operated Valve
Air Vent
Pressure Switch
Aquastat Union
Gas Pressure
Regulator
Automatic
Thermometer
Flow Switch
Pressure
Relief Valve
Reducing Valve
Self-Operated
Check Valve
Pressure
Va lv e
Pump
Motorized Valve
Solenoid
Ball Valve
Bufferfly Valve
Angle Valve
Gate Valve
Globe Valve
Balance Valve
Backflow-
Prevention
Device
3-Way Valve
Expansion
Tan k
Adjustment Procedure
To Maintain Inlet Temperature
Above Dew Point
T1-Temp-Min+110° For Atmospheric
T1-Temp-Min=125° Sealed Combusion
1. Turn heater on and open valves A & B.
2. After steady-state operation, ifT1 is less
than Temp-Min slowly close valve B until
T1 climbs to desired operating temperature
above Temp-Min.
3. IfT1 is greater than desired operating
temperature, slowly close valve A to adjust to
lower desired temperature above Temp-Min.
4. Check after system operating temperature
has stabiized.Make final adjustments.
5. Follow same adjustment procedure for
sealed combustion. H-3 Rev 5
NOTES:
1. Boiler circuit piping must
be large enough to handle
maximum flow through unit.
2. Boiler pump sized to boiler
design flow requirements.
3. All boilers furnished with
factory mounted outlet
water temperature gauge.
4. Boiler pump purging required.
Use terminals supplied.
Notice:These drawings show
suggested piping configuration
and valving.Check with local
codes and ordinances for
specific requirements.
H-15 Rev 4
NOTES:
1. Boiler circuit piping must be large enough to handle maximum flow through unit.
2. Boiler pump sized to boiler design flow requirements.
3. All boilers furnished with factory mounted outlet water temperature gauge.
4. Boiler pump purging required.Use terminals supplied.
5. Secondary loop pipe diameter must be sized large enough to handle maximum flow through all units.
Notice:These drawings show suggested piping configuration and valving.
Check with local codes and ordinances for specific requirements.

20
FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
DOMESTICWATER SUPPLY PIPING
CAUTION: Proper controls must be used to prevent
water supplied for domestic use from exceeding 130˚F,
54˚C or a scald injury will occur! When higher water
temperatures are required for appliances such as a
dishwasher, a mixing valve or some other tempering
means must be installed. Households with small
children may require water temperatures less than
120˚F, 49˚C. Local codes must be complied with!
General Piping Requirements
Ensure that the water heater is equipped with bronze
headers. Piping and components connected to the water
heater must be suitable for use with potable water. The
water heater must not be connected to any heating system
piping or components previously used with a non-potable
water heating appliance.No toxic chemicals, such as those
used for boiler treatment, are to be introduced into the
potable water used for space heating.If a hot water storage
tank is used in the system it must be equipped with a
temperature and pressure relief valve that complies with
ANSI Z21.22 or CAN-4.4 and CAN-4.6.
NOTE: The storage tank must be located as close to
the water heater as possible to prevent excessive head
loss which will reduce flow.
Water Chemistry
The required temperature rise across the water heater
is based on water having a hardness between 8 and 18
grains per gallon with a level of dissolved solids not
exceeding 350 ppm.Water having a hardness less than 8
grains can cause excessive corrosion of the heat
exchanger. Water that has a hardness greater than 18
grains per gallon and/or a level of dissolved solids
exceeding 350 ppm will require a recalculation of the pump
size and temperature rise.
A cupro-nickel heat exchanger may also be required.The
manufacturer should be consulted when these water
conditions are encountered. See Table 5A.
CAUTION:
The maximum allowable flow rate through a
Futera II water heater is 97 GPM, 6.1 L/s on 500 through
1000 models and 136 GPM, 8.6 L/s for 1250 through 1950
models. The Cupro-Nickel heat exchanger allows for
108 GPM, 6.8 L/s on 500 through 1000 models and
151 GPM,9.5 L/s on 1250 through 1950 models.SeeTable
5B.
RBI water heaters are designed to run scale free. Due to
the extreme variables of water conditions world wide it is
necessary to consider pH values and water hardness in
relationship to scaling. It is crucial to consider these two
variables when making heat exchanger and pump
selection. If local water conditions are extreme, follow the
guidelines in the Heat Exchanger Selection Table (Table
5A) and the Pumping Performance Table (Table 5B).Scale
free operation can be achieved by using water with a
hardness between 8 and 18 and by maintaining the pH
between 5 and 9. Follow the conditions listed under
NORMAL in the table. In some areas of the country
additional precautions must be observed due to unusual
characteristics of the local water supply. Call the nearest
RBI representative for details.
To properly size the pump a grain hardness and pH test
must be taken at the installation site before order is placed.
Proper pump sizing will improve heater performance and
help ensure heater longevity.