Rheem RTGH-C95DVLN User manual

AP18818 (04/17)
Do not destroy manual. Please read
carefully and keep in a safe place
for future reference.
WARNING:
This water heater is not suitable
for use in manufactured (mobile)
homes.
WARNING:
If the information in these
instructions is not followed
exactly, a fire or explosion may
result, causing death, personal
injury, or property damage.
For Your Safety!
• Do not store or use gasoline
or other flammable vapors and
liquids in the vicinity of this or
any other appliance. To do so
may result in an explosion or
fire.
• Installation and service must
be performed by a qualified
installer, service agency, or the
gas supplier.
What to Do If
You Smell Gas
• Do not try to light any
appliance.
• Do not touch any electrical
switch; do not use any
phone in your building.
• Immediately call your gas
supplier from a neighbor’s
phone. Follow the gas supplier’s
instructions.
• If you cannot reach your
gas supplier, call the fire
department.
• Do not return to your home until
authorized by the gas supplier
or fire department.
COMMON VENTING
INSTALLATION
INSTRUCTIONS
For commercial installation only
RTGH-C95DVLN (Standard commercial) and
RTGH-CM95DVLN (Manifold ready)
Natural gas only
This instructions is a supplement to the Commercial
Tankless Water Heater Use and Care manual.
Additional information can be obtained from the
Rheem Commercial Tankless Water Heater Use and
Care Manual.

Safety
2
CONTENTS
READ THE SAFETY INFORMATION
Your safety and the safety of others are very important.
There are many important safety messages in this manual
and on your appliance. Always read and obey all safety
messages.
This is the safety alert symbol. Recognize this
symbol as an indication of Important Safety
Information! This symbol alerts you to potential
hazards that can kill or hurt you and others.
All safety messages will follow the safety alert symbol
and either the word “DANGER,” “WARNING,” “CAUTION,”
or “NOTICE.”
These words mean:
IMPORTANT SAFETY INFORMATION
WARNINGS:
• This water heater is not approved for use in
manufactured (mobile) homes!
• Improper installation, adjustment, alteration, service,
or maintenance can cause death, personal injury, or
property damage. Follow the instructions in this manual.
READ ALL INSTRUCTIONS
BEFORE USING.
Be sure to read and understand the entire Installation Instruction
before attempting to install common venting. It may save
you time and money. Pay particular attention to the Safety
Instructions. Failure to follow these warnings could result
in death or serious bodily injury. Should you have problems
understanding the instructions in this manual, or have any
questions, STOP and get help from a qualified service technician
or the local gas utility.
WARNING:
California Proposition 65
This product contains chemicals known to the state of California
to cause cancer, birth defects, or other reproductive harm.
DANGER: An imminently hazardous situation that
will result in death or serious injury.
NOTICE: Attention is called to observe a specified
procedure or maintain a specific condition.
CAUTION: A potentially hazardous situation that
may result in minor or moderate injury.
WARNING: A potentially hazardous situation
that can result in death or serious injury and/or damage to
property.
Important Safety Information
Safety Precautions………………………………………………2-8
Installation Instructions
Sizing ……….............................................................................9
Common Vent Kit Components……….....................................10
Typical Common Vent Installation……...............................11-12
Common Venting……………………........………….............13-29
Condensate…………………………........…………………....…30
Multiple Units Controls…...………………........…………..........30
Initial Power up Sequence……………………........……...........31
Installation Check List………………………………..................32
High Altitude Adjustment……………………............................32
Preventive Maintenance……………………………..................33
Parts Order……………………………………………….........…34
If You Need Service
Call for Assistance………………………………………............36

Safety
3
IMPORTANT SAFETY INFORMATION
DANGER
FLAMMABLES
Flammable Vapors
Water heater has a main
burner flame.
The main burner flame:
1. which can come on
at any time and
2. will ignite flammable
vapors.
Vapors:
1. cannot be seen,
2. are heavier than air,
3. go a long way on the
floor and
4. can be carried from
other rooms to the
main burner flame by
air currents.
Vapors from flammable
liquids will explode and
catch fire causing death or
severe burns.
Do not use or store flammable
products such as gasoline,
solvents or adhesives in the
same room or area near the
water heater.
Keep flammable products:
1. far away from heater,
2. in approved containers,
3. tightly closed and
4. out of children's reach.
Installation:
Do not install water heater
where flammable products will
be stored or used unless the
main burner flame is at least
18" above the floor. This will
reduce, but not eliminate, the
risk of vapors being ignited
by the main burner flame.
Read and follow water heater warnings and instructions. If
owners manual is missing, contact the retailer or manufacturer.
Water Heater Venting Safety
DANGER:
• Failure to install and properly vent the water heater to
the outdoors as outlined in the “Venting” section of the
Installation Instructions in this manual will result in
death from fire, explosion, or asphyxiation from carbon
monoxide. NEVER operate this water heater unless it is
properly vented and has the air supply piping properly
installed and terminated to the outdoors.
• Be sure to inspect the vent terminal, the air intake,
and the vent system on the water heater for proper
installation at initial start-up and at least annually
thereafter. Refer to the “Care and Cleaning” section
of this manual for more information regarding vent
system inspection.
WARNINGS:
• Gasoline and other flammable liquids, materials,
and vapors (including paint thinners, solvents,
and adhesives) are extremely dangerous. DO NOT
handle, use, or store gasoline or other flammable or
combustible materials anywhere in the vicinity of a
water heater or any other appliance. Be sure to read
and follow the labels on the water heater, as well as the
warnings printed in this manual. Failure to do so can
result in death, bodily injury, or property damage.
• Combustible construction refers to adjacent walls and
ceilings and should not be confused with combustible
or flammable products and materials. Combustible
materials, such as clothing, cleaning materials, or
flammable liquids, should never be stored in the vicinity
of this or any gas appliance. Fire or explosion can occur
causing death, personal injury, and/or property damage.
See page 29 for clearances to combustible materials.
• Follow vent manufacturer’s instructions for venting
installation, including additional clearances from
combustibles, to avoid conditions that can lead to
death, personal injury, and/or property damage.
• Use tankless water heater manufacturer-approved
InnoFlue® PP common vent material. No other vent
material is permitted. For Canada, installations must
follow ULC S636 for exhaust venting.
• Moisture in the flue gas will condense as it leaves the
vent terminal. In cold weather this condensate can
freeze on the exterior wall, under the eaves, and on
surrounding objects. Some discoloration to the exterior
of the building is to be expected. However, improper
location or installation may result in severe damage to
the structure or exterior finish of the building.
• For multiple-unit installation, a minimum distance
between vent terminations must be maintained to
prevent recirculation of vent gases. See page 39 for
information on venting and clearances to multiple
terminations.
CAUTIONS:
• Ensure that the appliance vent is securely glued and
attached to the vent connection on the top of the water
heater. DO NOT USE SCREWS.
• DO NOT operate without the condensate drain connected
and routed to a proper drain.

4
DANGER
!
HOT
Water temperature over 125°F (52°C)
can cause severe burns instantly or
death from scalds.
Children,disabled and elderly are
at highest risk of being scalded.
See instruction manual before
setting temperature at water
heater.
Feel water before bathing or
showering.
Temperature limiting valves are
available, see manual.
BURN
!
DANGERS:
• WATER TEMPERATURE SETTINGS
– Safety and energy conservation
are factors to be considered when
selecting the water temperature
setting of a water heater’s remote
control. Water temperatures above
125°F (52°C) can cause death
or severe burns from scalding.
Be sure to read and follow the
warnings outlined on the pictured
label.
• There is a hot water scald potential
if the water temperature is set
too high. Households with small
children, the disabled, or elderly
persons may require a 120°F
(49°C) or lower temperature setting
to prevent contact with “HOT”
water.
• Before manually operating the
relief valve, make certain no one
will be exposed to the danger
of the hot water released by
the valve. The water may be hot
enough to create a scald hazard.
The water should be released into
a suitable drain to prevent injury or
property damage.
• Failure to perform the recommended Routine Preventive
Maintenance can harm the proper operation of this
water heater, which can cause carbon monoxide
dangers, excessive hot water temperatures, and other
potentially hazardous conditions.
!
WARNINGS:
• IMPORTANT: DO NOT apply heat to the HOT or COLD
water connections. If sweat connections are used,
sweat tubing to adapter before fitting adapter to the
water connections on heater. Any heat applied to the
water supply fittings will permanently damage the
internal components of the water heater.
• In case the pipe insulation is not rated for the
appropriate weather conditions, install electric heat
tracing or equivalent to prevent freezing of the pipes.
DO NOT insulate or block the drain valve on the hot
outlet fitting. If the pipes are allowed to freeze, the
water heater and the pipes may malfunction or leak due
to freezing water.
• Failure to drain the water heater as described on page
20 can cause serious personal injuries from scalding
and/or damage the water heater.
IMPORTANT SAFETY INFORMATION
Water Supply Safety
Temperature Conversion Chart °F/°C
85 100 102 104 106 108 110 112 114 116 118 120 125 130 140 °F
29 38 39 40 41 42 43 44 46 47 48 49 52 54 60 °C
Time/Temperature Relationship in Scalds
120°F (49°C) More than 5 minutes
125°F (52°C) 1 1/2 to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1 1/2 seconds
155°F (68°C) About 1 second
Table courtesy of Shriners Burn Institute
Water Temperature Time to Produce
a Serious Burn
Safety
CAUTIONS:
•This water heater must only be used
with the following water supply system
conditions:
– With clean, potable water free of corrosive
chemicals, sand, dirt, or other contaminants.
– With inlet water temperatures above 32°F
(0°C), but not exceeding 120°F (49°C).
– DO NOT reverse the hot and cold water
connections. The water heater will not operate.
•Even when drained properly, a small
amount of water will remain in the water
heater. In cold weather conditions, this
water can freeze. If this happens, allow
the defrost protection on the heater
at least 30 minutes to melt the frozen
water or the water heater may not work
properly.
NOTICE:
The factory setting allows operating
temperatures between 100°F (38°C) and 120°F
(49°C). Temperatures of 85°F (29°C) and up to
185°F (85°C) can be achieved with the MAIN
(UMC-117) remote control. Temperatures of
85°F (29°C) can be achieved with the Bath
(USC-117 or USC2-117) remote control. Only
qualified service personnel should perform this
adjustment. Only factory-authorized remote control(s) should be
used.

5
IMPORTANT SAFETY INFORMATION
WARNINGS:
• The installation of gas piping must comply with local
utility company requirements and/or in the absence of
local codes, use the latest edition of National Fuel Gas
Code (NFGC), ANSI Z223.1/NFPA 54, or CAN/CSA B149.1,
Natural Gas and Propane Installation Code.
• If inlet gas pressure is out of allowable range [4.0” w.c.
(1.0kPa) – 10.5” w.c. (2.6kPa)] for Natural Gas, a gas
pressure regulator must be installed to maintain the
allowable inlet gas pressure.
• Should overheating occur or the gas supply fail to shut
off, turn off the manual gas control valve to the water
heater.
CAUTIONS:
• DO NOT attempt repair of electrical wiring, gas piping,
remote control, burners, vent connectors, or other safety
devices. Refer repairs to qualified service personnel.
• Turn off the manual gas shut-off valve if the water
heater has been subjected to overheating, fire, flood,
physical damage, or if the gas supply fails to shut off.
• DO NOT turn on the water heater unless the water and
gas supplies are completely opened.
Natural Gas Safety
DANGERS:
• Never attempt to convert the water heater from natural
gas to LP or vice versa. The water heater must only use
the fuel type in accordance with listing on data plate—
natural gas for natural gas units. Any other fuel usage
will result in death or serious personal injury from fire
and/or explosion. This water heater is not certified for
any other fuel type.
• Both natural gas and propane (LP) have an odorant
added to aid in detecting a gas leak. Some people
may not physically be able to smell or recognize this
odorant. If you are unsure or unfamiliar with the
smell of natural gas or LP, ask the gas supplier. Other
conditions, such as “odorant fade,” which causes
the odorant to diminish in intensity, can also hide or
camouflage a gas leak.
• Water heaters using LP gas are different from natural
gas models. A natural gas water heater will not
function safely on LP.
• Before attempting to light the water heater, make sure
to look and smell for gas leaks. Use a soapy solution
to check all gas fittings and connections. Bubbling at
a connection indicates a leak that must be corrected.
When smelling to detect a gas leak, be sure to also sniff
near the floor.
• Gas detectors are recommended in LP and natural
gas applications and their installation should be
in accordance with the detector manufacturer’s
recommendations and/or local laws, rules, regulations,
or customs.
• Combustible materials, such as clothing, solvents,
cleaning materials, or flammable liquids, must not be
placed in the vicinity of the water heater.
• If a gas leak is present or suspected:
– DO NOT attempt to find the cause yourself.
– Never use an open flame to test for gas leaks. The gas can
ignite resulting in death, personal injury, or property damage.
– Follow the steps listed under “What to Do If You Smell Gas”
found on the front cover of this manual.
Safety

6
IMPORTANT SAFETY INFORMATION
Before operating this water heater, be sure to read and
follow the instructions on the label pictured below and all
other labels on the water heater, as well as the warnings
printed in this manual.
Failure to do so can result in unsafe operation of the water
heater, resulting in death, personal injury, or property
damage. Should you have any problems reading or
following the instructions in this manual, STOP and get
help from a qualified service technician.
WARNING : If you do not follow these instructions exactly, a fire or explosion may result
causing property damage, personal injury or loss of life.
FOR YOUR SAFETY READ BEFORE OPERATING
1.STOP! Read the safety information above on this label.
2.Turn off all electric power to the appliance.
3.DO NOT attempt to light the burner by hand.
4.Turn the Gas Shutoff Valve located on the outside of the unit
clockwise to the "OFF" position.
5.Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow "B" in
the safety information above on this label. If you don't smell gas, go to the next step.
6.Turn the Gas Shutoff Valve located on the outside of the unit counterclockwise to
the "ON" position.
7.Turn on all electric power to the appliance.
8.If the appliance will not operate, follow the instructions "To Turn Off Gas To Appliance"
and call your service technician or gas supplier.
TO TURN OFF GAS TO APPLIANCE
1 . Turn off all electric power to the appliance if service is to be performed.
2
. Turn the Gas Shutoff Valve located on the outside of the unit clockwise to the "OFF" position.
GAS SHUTOFF
VALVE
OPEN CLOSE
OPERATING INSTRUCTIONS
Safety

7
IMPORTANT SAFETY INFORMATION
Electrical Safety
DANGER:
• Shock Hazard – Make sure the electrical power to the
water heater is off to avoid electric shock that will
result in death or serious personal injury.
WARNINGS:
• For your safety, the information in this manual must
be followed to minimize the risk of fire, explosion, or
electric shock that can result in death, personal injury,
and/or property damage.
• Field wiring connections and electrical grounding must
comply with local codes or, in the absence of local
codes, with the latest edition of the National Electrical
Code, ANSI/NFPA 70, or in Canada, Canadian Electrical
Code, CAN/CSA C22.1, Part 1.
CAUTIONS:
• Label all wires prior to disconnecting for service. Wiring
errors can cause dangerous and improper operation.
Verify correct operation after servicing.
• For your safety, burner inspection and cleaning should
be performed only by qualified service personnel.
• Make certain the power to the water heater is OFF
before removing the unit cover panel. Exposed
electrical components and moving parts can cause
personal injuries.
• For your safety, DO NOT attempt repair of electrical
wiring, gas piping, remote control, burners, vent
connectors, or other safety devices. Refer repairs to
qualified service personnel.
Safety
California law requires that water heaters must be braced,
anchored, or strapped to resist falling or horizontal
displacement due to earthquake motions. For water
heaters up to 52-gallon capacity, a brochure with generic
earthquake bracing instructions can be obtained from:
Office of the State Architect, 1102 Q Street, Suite 5100,
Sacramento, CA 95814, or you may call 916-445-8100 or
ask a water heater dealer.
However, applicable local codes shall govern installation.
For residential water heaters of a capacity greater than
52 gallons or tankless-style, consult the local building
jurisdiction code for acceptable bracing procedures.
FOR INSTALLATIONS IN THE STATE OF CALIFORNIA

8
IMPORTANT SAFETY INFORMATION
General Installation and Maintenance Safety
WARNINGS:
• This water heater must be installed in accordance
with these instructions, local codes, utility company
requirements and/or in the absence of local codes,
use the latest edition of the American National
Standard/National Fuel Gas Code (NFGC), ANSI Z223.1
and National Fire Protection Association, NFPA 54, or
in Canada, CAN/CSA B149.1, Natural Gas and Propane
Installation Code, and the latest edition of the
National Electrical Code, ANSI/NFPA 70, or in Canada,
Canadian Electrical Code, CAN/CSA C22.1, Part 1.
• For your safety, DO NOT attempt to disassemble this
water heater for any reason. Improper adjustments,
alterations, service, or maintenance can cause death,
personal injury, or property damage.
SAVE THESE INSTRUCTIONS
SAFETY PRECAUTIONS:
Read this manual entirely before installing and/or operating
the water heater.
Use this water heater only for its intended purpose as
described in this Use and Care Manual.
Have the installer show you the location of the gas shut-
off valve and how to shut it off if necessary. Turn off
the manual shut-off valve if the water heater has been
subjected to overheating, fire, flood, physical damage, or if
the gas supply fails to shut off.
Be sure your water heater is properly installed in
accordance with local codes and the provided installation
instructions.
DO NOT attempt to repair or replace any part of your water
heater unless it is specifically recommended in this manual.
All other servicing should be referred to a qualified service
technician.
PRODUCT INFORMATION
For Your Records
Write down and save the following product information
along with the original sales slip and/or cancelled check.
The model and serial numbers can be found on the top
label on the right side of the water heater.
MODEL NUMBER:
SERIAL NUMBER:
DATE OF INSTALLATION:
INSTALLING COMPANY/PHONE NUMBER:
PLUMBING CONTRACTOR/PHONE NUMBER:
See page 40 for additional service information.
Read This Manual
Inside you will find many helpful hints on how to use and
maintain your water heater properly. A little preventive care on
your part can save you time and money over the life of your
water heater.
Product Information Safety

9
The Rheem common vent system can only be used with following Rheem tankless water heaters:
RTGH-C95DVLN and RTGH-CM95DVLN
RTGH-CM95DVLN has a pre-installed manifold control. RTGH-C95DVLN is not shipped with manifold control. This is
the only difference between these two models. Both these models can be mixed to use with the Rheem common vent
system.
Total input rate will drop naturally as longer vent length is added. Expect 6 to 10% input rate drop with maximum vent length.
Cold water, hot water and natural gas sizes are recommended sizes. The size requirements may change based on water
pressure, gas pressure, pressure drop, and other factors at installation site. Adjust accordingly these sizes for each installation.
Number of
water heaters
Cold Water -
Recommended Manifold
Header Size (Inches)
Hot Water - Recommended
Manifold Header Size
(Inches)
Natural Gas -
Recommended Manifold
Header Size (Inches)
Total Input Rate
(Btu/h)
2
3
4
5
6
7
8
1
1
1 1/4
1 1/2
1 1/2
2
2
1
1
1 1/4
1 1/2
1 1/2
2
2
1
1 1/4
1 1/4
1 1/4
1 1/2
1 1/2
2
399800
599700
799600
999500
1199400
1399300
1599200
INSTALLATION INSTRUCTIONS
Standards Compliance
Sizing
Water heaters and common vent system must be
installed in accordance with these instructions, local
codes, and utility company requirements.
In the United States where local codes are not
available, use the latest edition of the American
National Standard/National Fuel Gas Code. A copy of
the Fuel Gas Code can be purchased from either the
American Gas Association, 400 North Capitol Street
Northwest, Washington, DC 20001, as ANSI standard
Z223.1, or National Fire Protection Association, 1
Batterymarch Park, MA 02269 as NFPA 54.
In Canada, use the latest edition of the CAN/CSA
B149.1 Natural Gas and Propane Installation Code and
the Canadian Electrical Code, CAN/CSA C22.1, Part 1.
A copy can be purchased from; Canadian Standards
Association, 5060 Spectrum Way, Mississauga, ON
L4W 5N6

10
PRODUCT INFORMATION
Product Information
Common Vent Kit Components
9
10
11
12 12
12
12
12
12
11
77
6
1
11
5
4
4
22
1
6
88
Exhaust
Air
Intake
Rheem Part Number Rheem Part NumberPart Description Part Description
SP20918A
SP20918J
SP20918X
SP20918L
SP20918K
SP20918D
SP20918G
SP20918E
SP20918F
SP20918C
SP20918B
SP20918Y
1
2
3
4
5
6
7
8
9
10
11
12
3" PVC to PP Adaptor
3", 87 Degree Elbow
3" Connector Ring
Air Intake Branch Tee
Tee Cap
Non-Return Valve (NRV)
4" Straight Pipe, 2'
Exhaust Branch Tee
Horizontal Drain Fitting
Universal Ball Valve Siphon
4", 87 Degree Elbow
4" Connector Ring

11
INSTALLATION INSTRUCTIONS
General
Typical Common Vent Installations
Typical Inline Common Vent Installations
Direct Vent
Power Vent (Room Air Application)
Wall 3 Degree upward
slope toward outside
To suitable drain
12” - 24” (31 cm – 61 cm)
Min 36”
(91cm)
Max 20’
(6.1m)
20.5”(52 cm)
3°
SCALE1.000
Wall
12” - 24”
(31 cm – 61 cm)
20.5”(52 cm) To suitable drain
3 Degree upward
slope toward outside
FOR YOUR SAFETY
DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. To do so may result in an
explosion or fire.
This water heater can use room air for combustion and ventilation as long as the installation complies with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54, and other applicable standards and local codes. Failure to comply with these standards and other instructions on
the Common Vent Installation Instructions and the Tankless Water Heater Use and Care Manual may result in death or serious injury and/or
damage to property.

12
INSTALLATION INSTRUCTIONS
General
Typical Common Vent Installations (cont.)
Rheem Part Number Common Vent Kit Description
SP20908A
SP20908B
SP20908C
SP20908D
SP20908E
SP20908F
SP20908G
8" Inline 2 units Direct Vent Header Kit
8" Inline 3 units Direct Vent Header Kit
8" Inline 4 units Direct Vent Header Kit
8" Inline 5 units Direct Vent Header Kit
8" Inline 6 units Direct Vent Header Kit
8" Inline 7 units Direct Vent Header Kit
8" Inline 8 units Direct Vent Header Kit
The following header vent kits can be purchased separately to create common venting system:
Rheem Part Number Common Vent Kit Description
SP20909A
SP20909B
SP20909C
SP20909D
SP20909E
SP20909F
SP20909G
8" Inline 2 units Room Air Header Kit
8" Inline 3 units Room Air Header Kit
8" Inline 4 units Room Air Header Kit
8" Inline 5 units Room Air Header Kit
8" Inline 6 units Room Air Header Kit
8" Inline 7 units Room Air Header Kit
8" Inline 8 units Room Air Header Kit
These kits contain only minimum required vent parts to create a common venting trunk line and a connection from
the trunk line to water heaters. Vent parts included in these kits DO NOT count for equivalent vent length except a
87 degree elbow for the air intake included in a room air kit. Additional vent parts will be required to complete the
common venting system. Refer to “Parts List” of this installation instructions for additional information.

13
Common Venting for Direct-Vent Water Heater
Only commercial tankless water heaters (RTGH-
C95DVLN and RTGH-CM95DVLN) with common vent
gas chip are allowed to utilize the InnoFlue® common
venting system. The common vent gas chip is shipped
with these applicable models. These commercial
tankless models without the common vent gas chip,
or any other tankless models are prohibited to utilize
Rheem approved common venting system.
DANGER:
Failure to properly vent the water heater to the outdoors
as outlined in this Venting section will result in death or
serious personal injury. To avoid the risk of fire, explosion,
or asphyxiation from carbon monoxide, NEVER operate the
water heater unless it is properly vented and has adequate
air supply for proper operation as outlined in this Venting
section. This water heater must have air supply connected
and terminated to the outdoors.
WARNING:
Refer to page 16 for required clearances to combustible
materials. Improper clearances can cause explosion or fire
resulting in death, personal injury, and/or product damage.
CAUTIONS:
• Check to make sure flue gases DO NOT recirculate into the
air intake terminal when using direct venting. If the water
heater is having service issues, flue recirculation may be a
contributing factor.
• Even when the minimum vent terminal separation
distances are followed, recirculation may still occur
depending upon the location outside the building, the
distance from other buildings, proximity to corners,
weather conditions, wind patterns, and snow depth.
• Periodically check to make sure that flue recirculation
is not occurring. Signs of flue gas recirculation include
frosted or frozen intake terminals and condensate in the
intake terminal and venting system.
• Correction to flue recirculation may involve angling the
intake away from the exhaust terminal and increasing the
distance between them. Check to be sure the intake and
exhaust terminals are not obstructed, especially during
periods of below-freezing weather.
Venting Requirements
The installation of venting must comply with national
codes, local codes, and the vent manufacturer’s
instructions.
The vent exhaust and air intake must terminate outside
as described in these instructions. DO NOT terminate
exhaust pipe or air intake pipe in a chimney. It must be
vented separately from all other appliances.
NOTICE:
The unit with common vent can be vented using only the
following approved vent pipe material.
Use only 8 inch diameter InnoFlue® common vent
pipe. Use 3 or 4 inch diameter InnoFlue® vent pipe to
connect a tankless water heater with the common vent
trunk. Refer to local codes for restrictions on the use
of InnoFlue® PP pipe and fittings. All exhaust venting
materials for product installed in Canada must meet
ULC-S636.
The use of cellular core PVC (ASTM F891), cellular
core CPVC, or Radel® (polyphenolsulfone) in non-
metallic venting systems is prohibited and that
covering non-metallic vent pipe and fittings with
thermal insulation is prohibited.
Common venting system shall be in accordance with
the National Fuel Gas Code, ANSI Z223.1/NFPA 54
and/or the CSA B149.1, Natural Gas and Propane
installation Code (Current Editions), local codes, and
the manufacturer’s instructions. This Common vent is
permitted for commercial installation only.
Acceptable materials:
InnoFlue® PP
The fittings, other than the VENT TERMINAL,
should be equivalent to the following:
InnoFlue® PP
DO NOT USE any flexible vent.
Recommended Vent Lengths
Before starting the vent installation, careful planning
should be given to the routing and termination of the
vent pipes. The length of the vent pipes (air intake and
exhaust) should be kept to a minimum. Also, see pages
18-20 and 29-31 for vent terminal placement. Refer to
the maximum and minimum vent length charts for the
pipe sizes that can be used and the total equivalent
length of pipe that can be used. DO NOT exceed
equivalent length of pipe in maximum vent length chart.
Maximum Vent Length (air intake and exhaust) each:
Equivalent Vent Length:
INSTALLATION INSTRUCTIONS
Number of
water heaters
8" Common
Vent
2
3
4
5
6
7
8
9
10
100' (30 m)
100' (30 m)
100' (30 m)
100' (30 m)
82' (25 m)
55' (17 m)
43' (13 m)
N/A
N/A
8" Common
Vent
87 Degree
Elbow
45 Degree
Elbow
5.0' (1.5 m)
2.5' (0.8 m)

14
INSTALLATION INSTRUCTIONS
Venting
The system will not operate if there is excessive
restriction (pressure drop) in the venting system. Use
the chart above to calculate the maximum pipe run
length with the required number of elbows.
The vent termination does not count as part of the
straight pipe equivalent when determining the total vent
length.
Minimum Vent Length:
All intake and exhaust common venting components
must have the same diameter size. DO NOT use
a different size on the intake and exhaust common
venting.
The unit may be vented horizontally through a wall
or vertically through the roof. Pipe runs must be
adequately supported along both vertical and horizontal
runs. Maximum unsupported span is recommended
to be no more than 39” (1 m) horizontally or 78” (2 m)
vertically. It is imperative that the first hanger be located
on the horizontal runs immediately adjacent to the
first 87-degree elbow from the vertical rise. Only use
support isolation hanging bands. DO NOT use wire to
support pipe runs.
Stress levels in the pipe and fittings can be significantly
increased by improper installation. If rigid pipe clamps
are used to hold the pipe in place, or if the pipe cannot
move freely through a wall penetration, the pipe may
be directly stressed, or high thermal stresses may be
formed when the pipe heats up and expands. Install
accordingly to minimize such stresses.
Preexisting Venting Notes:
If the water heater is being installed as a replacement
for an existing water heater, a thorough inspection of
the existing venting and air intake system must be
performed prior to any installation work. Verify that the
correct materials, vent lengths, and terminal locations
as described in this manual have been met. Carefully
inspect the entire venting and air intake system for
any signs of cracks or fractures, particularly at the
joints between elbows or other fittings and the straight
runs of vent pipe. Check the system for signs of
sagging or other stresses in the joints as a result of
misalignment of any components in the system. If any
of these conditions are found, they must be corrected in
accordance with the venting instructions in this manual
before completing the installation and putting the water
heater into service.
NOTICES:
• It is required that the exhaust common venting pipe have
a 5/8" per foot (5.6 cm per meter) upward slope toward the
outdoors.
• A clearance of 0 in. (0 cm) is allowed between the
exhaust common vent pipe or the air intake common vent
pipe and combustible material.
• Use proper support for the exhaust common vent pipe and
the air intake common vent pipe.
• It is recommended the support method used isolates the
vent pipe from floor joists or other structural members. This
helps prevent transmission of noise and vibration.
• DO NOT support, pin, or otherwise secure the common
venting system in a way that restricts the normal thermal
expansion and contraction of the chosen venting material.
Venting for Direct-Vent Water Heater (cont.)
8" Common
Vent
Exhaust
Air Intake
One 87 Degree Elbow +
Termination
One 87 Degree Elbow

15
Venting for Direct-Vent Water Heater (cont.)
In the Commonwealth of Massachusetts
The Commonwealth of Massachusetts requires
compliance with regulation 248 CMR 4.00 and 5.00 for
installation of through-the-wall vented gas appliances
as follows:
5.08: Modifications to NFPA–54, Chapter 10
(1) Revise NFPA–54 section 10.5.4.2 by adding a
second exception as follows:
Existing chimneys shall be permitted to have their use
continued when a gas conversion burner is installed,
and shall be equipped with a manual reset device that
will automatically shut off the gas to the burner in the
event of a sustained back-draft.
(2) Revise 10.8.3 by adding the following additional
requirements:
(a) For all side-wall, horizontally vented, gas-fueled
equipment installed in every dwelling, building,
or structure used in whole or part for residential
purposes, including those owned or operated by the
Commonwealth and where the side-wall exhaust
vent termination is less than seven (7) feet above
finished grade in the area of the venting, including
but not limited to decks and porches, the following
requirements shall be satisfied.
1. INSTALLATION OF CARBON MONOXIDE
DETECTORS. At the time of installation of the side-
wall, horizontally vented, gas-fueled equipment, the
installing plumber or gas fitter shall observe that a
hard-wired carbon monoxide detector with an alarm
and battery backup is installed on the floor level where
the gas equipment is to be installed. In addition, the
installing plumber or gas fitter shall observe that a
battery-operated or hard-wired carbon monoxide
detector with an alarm is installed on each additional
level of the dwelling, building, or structure served by the
side-wall, horizontally vented, gas-fueled equipment.
It shall be the responsibility of the property owner to
secure the services of qualified licensed professionals
for the installation of hard-wired carbon monoxide
detectors.
a. In the event that the side-wall, horizontally vented, gas-
fueled equipment is installed in a crawl space or an attic, the
hard-wired carbon monoxide detector with alarm and battery
backup may be installed on the next adjacent floor level.
b. In the event that the requirements of this subdivision cannot
be met at the time of completion of installation, the owner
shall have a period of thirty (30) days to comply with the
above requirements, provided, however, that during said thirty
(30) day period, a battery-operated carbon monoxide detector
with an alarm shall be installed.
2. APPROVED CARBON MONOXIDE DETECTORS. Each
carbon monoxide detector as required in accordance with the
above provisions shall comply with NFPA 720 and be ANSI/
UL 2034-listed and IAS-certified.
3. SIGNAGE. A metal or plastic identification plate shall be
permanently mounted to the exterior of the building at a
minimum height of eight (8) feet above grade directly in line
with the exhaust vent terminal for the horizontally vented,
gas-fueled heating appliance or equipment. The sign shall
read, in print size no less than one-half (1/2) inch in size,
“GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL
OBSTRUCTIONS.”
4. INSPECTION. The state or local gas inspector of the
side-wall, horizontally vented, gas-fueled equipment shall not
approve the installation unless, upon inspection, the inspector
observes carbon monoxide detectors and signage installed
in accordance with the provisions of 248 CMR 5.08 (2)(a)(1
through 4).
(b) EXEMPTIONS: The following equipment is exempt from
248 CMR 5.08 (2)(a)(1 through 4):
1. The equipment listed in Chapter 10 entitled “Equipment Not
Required To Be Vented” in the most current edition of NFPA
54 as adopted by the Board, and
2. Product-approved side-wall, horizontally vented, gas-fueled
equipment installed in a room or structure separate from the
dwelling, building, or structure used in whole or in part for
residential purposes.
(c) MANUFACTURER REQUIREMENTS – GAS
EQUIPMENT VENTING SYSTEM PROVIDED. When the
manufacturer of product-approved side-wall, horizontally
vented, gas-fueled equipment provides a venting system
design or venting system components with the equipment,
the instructions provided by the manufacturer for installation of
the equipment and the venting system shall include:
1. Detailed instructions for the installation of the venting
system design or the venting system components; and
2. A complete parts list for the venting system design or
venting system.
(d) MANUFACTURER REQUIREMENTS – GAS
EQUIPMENT VENTING SYSTEM NOT PROVIDED. When
the manufacturer of product-approved side-wall, horizontally
vented, gas-fueled equipment does not provide the parts
for venting the flue gases, but identifies “special venting
systems,” the following requirements shall be satisfied by the
manufacturer:
1. The referenced “special venting systems” instructions shall
be included with the appliance or equipment installation
instructions, and
2. The “special venting systems” shall be product-approved by
the Board, and the instructions for that system shall include a
parts list and detailed installation instructions.
(e) A copy of all installation instructions for all product-
approved side-wall, horizontally vented, gas-fueled
equipment, all venting instructions, all parts lists for venting
instructions, and/or all venting design instructions shall remain
with the appliance or equipment at the completion of the
installation.
INSTALLATION INSTRUCTIONS

16
INSTALLATION INSTRUCTIONS
Venting
Regulator
vent outlet
Fixed
closed
Fixed
closed
Inside
corner detail
Operable
Operable
The following information should be used for determining the proper location of the vent terminal for direct vent
water heaters.
VVENT TERMINAL XAIR SUPPLY INLET AREA WHERE TERMINAL IS NOT PERMITTED
Horizontal Vent Terminal Location for Direct Vent
Canadian Installations 1US Installations 2
A= Clearance above grade, veranda,
porch, deck or balcony. 12 inches (30 cm) 12 inches (30 cm)
B= Clearance to window or door that
may be opened.
6 inches (15 cm) for appliances <10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3kW) and
<100,000 Btuh (30kW), 36 inches (91 cm)
for appliances > 100,000 Btuh (30kW).
6 inches (15 cm) for appliances.< 10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances > 10,000 Btuh (3 kW) and
< 50,000 Btuh (15 kW), 12 inches (30 cm)
for appliances > 50,000 Btuh (15 kW)
C= Clearance to permanently closed
window. * *
D= Vertical Clearance to ventilated
soffit located above the terminal
within a horizontal distance of 2
feet (61 cm) from the center line of
the terminal.
**
E= Clearance to unventilated soffit. * *
F= Clearance to outside corner. **
G= Clearance to inside corner. **
1 In accordance with current CAN/CSA-B149.1 Installation Codes.
2 In accordance with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code.
+ A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family
dwellings and serves both dwellings.
*"Clearance in accordance with local installation codes and the requirements of the gas supplier."
H = Clearance to each side of center line
extended meter/regulator assembly. **
I = Clearance to service regulator vent
outlet.
Above a regulator within 3 feet (91 cm)
horizontally of the vertical center line of the
regulator vent outlet to a maximum vertical
distance of 15 feet (4.5 m).
*
J = Clearance to nonmechanical air
supply inlet to the building or the
combustion air inlet of any other
appliance.
6 inches (15 cm) for appliances < 10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3kW) and
< 100,000 Btuh (30kW), 36 inches (91 cm)
for appliances > 100,000 Btuh (30kW).
6 inches (15 cm) for appliances.< 10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances > 10,000 Buth (3 kW) and
< 50,000 Btuh (15 kW), 12 inches (30 cm)
for appliances > 50,000 Btuh (15 kW)
K = Clearance to mechanical air
supply inlet. 6 feet (1.83 m) 3 feet (91 cm) above if within 10 feet(3 m)
horizontally.
L = Clearance above paved sidewalk
or paved driveway located on
public property.
7 feet (2.13 m)+ *
M = Clearance under veranda, porch,
deck or balcony. 12 inches (30 cm) *

17
INSTALLATION INSTRUCTIONS
Venting
Fixed
closed
Fixed
closed
Inside
corner detail
Operable
Operable
The following information should be used for determining the proper location of the vent terminal for direct vent water
heaters.
VVENT TERMINAL XAIR SUPPLY INLET AREA WHERE TERMINAL IS NOT PERMITTED
Horizontal Vent Terminal Location for Power Vent (Room Air Application)
Canadian Installations 1US Installations 2
A= Clearance above grade, veranda, porch,
deck or balcony. 12 inches (30 cm) 12 inches (30 cm)
B= Clearance to window or door that may
be opened.
6 inches (15 cm) for appliances < 10,000 Btuh (3
kW), 12 inches (30 cm) for appliances > 10,000 Btuh
(3kW) and < 100,000 Btuh (30kW), 36 inches (91
cm) for appliances > 100,000 Btuh (30kW).
4 feet (1.2 m) below or to side of
opening; 1 foot (300 mm) above
opening.
C= Clearance to permanently closed
window. * *
D= Vertical Clearance to ventilated soffit located
above the terminal within a horizontal distance
of 2 feet (61 cm) from the center line of the
terminal.
**
E= Clearance to unventilated soffit. * *
F= Clearance to outside corner. * *
G= Clearance to inside corner. * *
1 In accordance with current CAN/CSA-B149.1 Installation Codes.
2 In accordance with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code.
+ A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family
dwellings and serves both dwellings.
*"Clearance in accordance with local installation codes and the requirements of the gas supplier."
H = Clearance to each side of center line
extended meter/regulator assembly. **
I = Clearance to service regulator vent
outlet.
Above a regulator within 3 feet (91 cm) horizontally of
the vertical center line of the regulator vent outlet to a
maximum vertical distance of 15 feet (4.5 m). *
J = Clearance to nonmechanical air supply
inlet to building or the combustion air
inlet to any other appliance..
6 inches (15 cm) for appliances < 10,000 Btuh (3
kW), 12 inches (30 cm) for appliances > 10,000 Btuh
(3kW) and < 100,000 Btuh (30kW), 36 inches (91
cm) for appliances > 100,000 Btuh (30kW).
4 feet (1.2 m) below or to side of
opening; 1 foot (300 mm) above
opening.
K = Clearance to mechanical air supply
inlet. 6 feet (1.83 m) 3 feet (91 cm) above if within 10
feet (3 m) horizontally.
L = Clearance above paved sidewalk or paved
driveway located on public property. 7 feet (2.13 m)+ 7 feet (2.13 m)+
M = Clearance under veranda, porch, deck
or balcony. 12 inches (30 cm) *
FOR YOUR SAFETY
DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. To do so may result in an
explosion or fire.
This water heater can use room air for combustion and ventilation as long as the installation complies with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54, and other applicable standards and local codes. Failure to comply with these standards and other instructions on
the Common Vent Installation Instructions and the Tankless Water Heater Use and Care Manual may result in death or serious injury and/or
damage to property.

18
Venting
INSTALLATION INSTRUCTIONS
Horizontal Vent Considerations
WARNING:
Moisture in the flue gas will condense as it leaves the vent
terminal. In cold weather this condensate can freeze on the
exterior wall, under the eaves, and on surrounding objects.
Some discoloration to the exterior of the building is to be
expected. However, improper location or installation can
result in severe damage to the structure or exterior finish of
the building.
–DO NOT locate vent terminal on the side of a building
with prevailing winter winds. This will help prevent
water lines from freezing and moisture from freezing on
walls and under eaves.
–DO NOT locate vent terminal too close to shrubbery, as
flue gases may damage them. A minimum distance of 4
ft. (1.22 m) is recommended.
–All painted surfaces should be primed to lessen the
chance of physical damage. Painted surfaces will
require maintenance.
–Guard against accidental contact with people and pets.
WARNING:
A minimum distance between terminations must be
maintained to prevent recirculation of vent gases. Maintain
edge to edge distance between an exhaust common vent
termination and an air intake common vent termination as
listed below:
Minimum 36" (91 cm) and maximum 20' (6.1m)
–DO NOT terminate vent directly on brick or masonry
surfaces. Use rust-resistant, sheet-metal backing plate
behind the vent.
–The vent for this appliance shall not terminate
• Over public walkways; or
• Near soffit vents or crawl space vents or other area
where condensate or vapor could create a nuisance
or hazard or cause property damage; or
• Where condensate or vapor could cause damage or
could be detrimental to the operation of regulators,
relief valves, or other equipment.
– Caulk all cracks, seams, and joints within
6 ft. (1.8 m) of the vent terminal.
–Caulk around wall faceplate for weather-tight seal.
–DO NOT extend exposed vent pipe of indoor water
heaters outside of the building.
–This water heater requires its own separate venting
system. DO NOT connect the exhaust vent to an existing
vent pipe or chimney.
Rising moisture will collect under eaves.
Inside
Corner
Caulk
Caulk
Caulk
If soffit vent is too close,
block off and install new
vent at another location.
6' (1.8 m) Caulk zone or
to edge of window etc.,
starting within 6' (1.8 m)
Minimum 36” (91 cm)
and maximum 20’ (6.1m)
4 ft (1.2 m)
Exhaust
Air Intake
Min 36” (91cm)
Max 20’ (6.1m)
AREA WHERE AIR INTAKE
IS NOT PERMITTED

19
Venting
INSTALLATION INSTRUCTIONS
Venting for Direct-Vent Water Heater (cont.)
Exhaust Vent
Pipe
Air Intake
Pipe
Wall plate
Inspection
Access Panel
(Optional)
Air Intake
Pipe
Wall Plate
Inspection
Access Panel
(Optional)
Ceiling
Upward Slope
to Termination
Exhaust Vent
Pipe
Termination
Te e
Ceiling
Upward Slope
to Termination
12”-24”
(31cm-61cm)
Min 36” (91cm)
Max 20’ (6.1m)
6”-12”
(15cm - 31 cm)
36”
(91cm)
36”
(91cm) Air intake
Exhaust
Termination Tee
AREA WHERE AIR INTAKE
IS NOT PERMITTED 12”-24”
(31cm-61cm)
Joint Connections
for 3” and 4” diameters
• Each female-end of every InnoFlue® vent length or
component features a factory installed gasket. Before
assembly, make sure gaskets are in place correctly.
• Measure the depth of the female socket. Mark* the
male-end of each component just shy of the depth of
the female socket from its end.
• Place a thin layer of Centrocerin, a water based
lubricant onto the male end of component 2 for ease of
assembly.
• Slip a Connector Ring over the male end of
component 2 so that it can grip the gasket bead of
component 1.
• Push and twist male end until properly seated in
component 1, aligning the mark with the top of the
female end.
• Clip the Connector Ring onto the gasket bead to
secure the two components to each other. Rotate the
“hook” to the side or bottom of the joint to facilitate
visual checks.
NOTICE:
To meet requirements of ULC-S636 & UL-1738, only
InnoFlue® Vent Systems of 2", 3", 4" and 5" diameters must
utilize Connector Rings.
Exhaust Vent Installation
Instructions
After the water heaters are mounted securely and
have 20.5” (52 cm) center to center distance, start
assembling the common venting system. Sparingly
apply Centrocerin to the gasket or male end of vent
pipe for ease of assembly.
Install a 3" PVC to PP adapter on the top of the water
heaters.
Install a Non-Return Valve (NRV) with siphon to the
PVC to PP adapter.
1
2
Component 1 Component 2

20
Install a 4" straight pipe to the NRV. Exhaust common
venting is required to have a 3° rise or a 5/8 per foot
(5.6 cm per meter) upward slope toward the outdoors.
When the water heaters are mounted with 20.5" (52
cm) center to center distance, 1" (2.5 cm) rise per water
heater is required. A 4" straight pipe included with our
common vent kit must be cut to an appropriate length
to have 1" (2.5 cm) rise per water heater. Cut pipe end
square, remove jagged edges and burrs, chamfer end
of pipe and clean the sealing gasket.
Install a 87° elbow to the 4" straight pipe.
Connect a feeder of a branch tee to the open end of
the elbow for inline installation.
Connect the branch tee to another branch tee. Repeat
steps 1 to 6 until all exhaust branch tees are connected.
Connect a horizontal drain fitting to the end of the
exhaust common vent trunk line.
Connect a ball siphon to the horizontal drain fitting.
3
4
5
6
7
8