EZ Supreme User manual

DOMESTIC TANKLESS GAS WATER HEATER
USER’S MANUAL
EZ Supreme
Read the installation instructions before installing the appliance.
Read the user’s instructions before powering on the appliance.
DIRECT VENT CONCENTRIC EXHAUST MODEL
ISO9001 Certified

NOTICE: For your safety and the safety of others, this heater cannot be connected to an
existing natural draft exhaust. Only the sealed-joint concentric intake/exhaust components
made specifically for this heater can be used. There are no compromises, do not attempt to
modify or substitute the exhaust/intake components of this heater! Multiple advanced
redundant electrical safety devices are integrated into the electronics of this heater, they
cannot be disconnected or bypassed and they are designed to detect any and all
modifications and incorrect connections. These devices will prevent the heater from
turning on. This heater will not run without the exhaust/intake pipe being connected.
PLEASE:
Do not proceed with the installation of this heater until you are familiar with the concept of
concentric intake/exhaust direct vent technology. This exhaust system is actually two pipes
in one. Most manufacturers have switched to this technology for many reasons. Maximum
efficiency and safety are two primary reasons. As this technology is relatively new, it is not
uncommon for users to not understand the concepts. If you are replacing an existing tank
type heater, there is no possible way to use the old exhaust pipes. It will not work, do not
try! With “Direct Vent” heaters made by any manufacturer, the intake air is drawn into
the heater from outdoors via one chamber or pipe, the exhaust exits via a second chamber
or pipe. With the EZ SUPREME model, the intake combustion air comes from outside via
the outer concentric chamber of our dual chamber pipe and the exhaust exits through the
inner part of the pipe.
If you are uncertain of what this technology means to you and how it saves you energy,
please read this manual thoroughly and review the information and videos on our website
at these links:
Technical information: http://www.eztankless.com/resources/articles/the-ez-deluxe-tankless-
water-heater-explained/
Videos: http://www.eztankless.com/videosandphotos.html
Thank you for your purchase and putting your trust in our company.
We are here to serve you, find us on the web at: http://www.eztankless.com/

Important things to remember during installation and initial operation
1. Direct Vent pipes –Make sure both intake-exhaust pieces (the 94 degree bend and the 31inch
long straight piece) are connected AND that each connection is sealed with heat sealant tape.
2. Heated Room –Be sure that the unit is being installed inside a heated room.
3. Plumbers Putty/Tape –Be careful not to over apply plumber’s putty/tape to the inlet and outlet
water fitting. The putty/tape if overdone can become caught in the inlet screen and/or the inlet
sensors and impellor that may adversely affect the performance of the unit. Examples are
shown below. The second picture shows sediments that can be in the water. This is why we also
HIGHLY recommend having an inline water filter before the tankless water heater.
Plumbers Tape Sediments in Water
4. Direct Vent on downward angle –To prevent any condensation from dripping inside the unit, be
sure to have the flue on a slight downward angle outside the home. (The elbow that turns the
exhaust-intake pipe into a horizontal position is pre-bent to 94 degrees to allow for a downward
slope of an additional 4 degrees).
5. Double Water Pressure –A common mistake by plumbers and amateur installers alike is to
erroneously connect cold pressurized water into the home’s hot water pipes. Typically this
happens at the point where the old tank-type heater is removed. On a tank-type heater there is
a cold line into the heater which comes from the cold inlet water system. Then there is an outlet
line from the heater into the hot water plumbing. If you are removing a tank-type heater and
mounting the tankless heater at another location, please remember NOT to join-together the
two water lines that were on the old tank-type heater. They must be “CAPPED-OFF”. If they are
connected; all you are doing is placing pressurized cold water into your hot water plumbing
system at that point. Not only will it be almost impossible for your new tankless heater to
overcome the cold water blending into your hot system, there may actually be pressure coming
back at the hot outlet side of your new tankless heater and it may not even run as the water will
essentially be “standing still”.
(a) Think of this as a stream or river, the system can only flow one direction. If you go down-
stream and divert the river and guide it back to the beginning, all you have is a lake, the flow is
defeated.
(b) If you divert the river into two rivers “hot and cold stream”, if you bring them back together
at another point, then they are one river again. What water you may have heated is now cooled
by the converging cold water returning into the flow of the river.)

PLEASE COMPLETELY 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. You’ll find many answers to common problems in the Troubleshooting
Guide. If you review the chart of Troubleshooting Tips first, you may not need to call for
service.
KEY WORDS USED IN THIS MANUAL
All safety messages will use either the word “DANGER”, “WARNING”, “CAUTION” or
“NOTICE”.
These words mean:
DANGER - An imminently hazardous situation that will result in death or serious injury.
WARNING - A potentially hazardous situation that could result in death or serious injury
and/or damage to property.
CAUTION - A potentially hazardous situation that may result in minor or moderate
injury.
NOTICE - Attention is called to observe a specified procedure or maintain a specific
condition.
FOR YOUR RECORDS
Write date of purchase here:
Staple sales slip or cancelled check here. Proof of the original purchase date is needed to
obtain service under the warranty.

DANGER!
PROPERLY INSTALL AND VENT THIS WATER HEATER…
Failure to properly install and properly vent the water heater to the outdoors as outlined in
the Venting Section of the Installation Instructions in this manual can result in unsafe
operation of the water heater. To avoid the risk of fire, explosion or asphyxiation from
carbon monoxide, never operate this water heater unless it is properly vented and has an
adequate air supply for proper operation.
Be sure to inspect the vent terminal, the air intake, and the coaxial 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.
WARNING!
Gasoline, as well as other flammable materials and liquids (adhesives, solvents, paint
thinners etc.), and the vapors they produce are extremely dangerous. DO NOT handle, use
or store gasoline or other flammable or combustible materials anywhere near or 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 property damage, bodily injury or death.

HOT WATER CAN SCALD!
• Water heated to temperatures for clothes washing, dish washing, and other sanitizing needs can scald and cause
permanent injury.
• Children, elderly, and infirm or physically handicapped persons are more likely to be permanently injured by hot
water. Never leave them unattended in a bathtub or shower. Never allow small children to use a hot water tap or
draw their own bath.
• If anyone using hot water in the building fits the above description, or if state laws or local codes require certain
water temperatures at hot water taps, you must take special precautions:
• Use lowest possible temperature setting.

STATE AND FEDERAL LAWS
120F ~ 48C - 1993 International Plumbing Code 97/00 - adopted by 18 U.S. states
120F ~ 48C - 1994 Uniform Plumbing Code (IAPMO/ICBO) 97/00 - 13 U.S. states
120F ~ 48C - 1996 International Plumbing Code SBCCI 97/00 - 10 U.S. states
120F ~ 48C - 1996 National Standard Plumbing Code PHCC 96/98 - 5 U.S. states

INSTALLATION:
Contact your local gas dealer or utility company specialist for a qualified engineer to
evaluate your plans and always use a qualified technician to install the gas water heater.
LOCATION FOR INSTALLATION:
The flue of this gas water heater should be installed through an external wall; the heater
can’t be installed outdoors
WARNING:
The Direct Vent Exhaust of this heater can’t be connected to a common natural draft flue!
Please don’t install the heater in places where special chemicals are used, like the
laundry or factory etc., otherwise it may cause internal metal corrosion and shorten the
life of the heater, or even cause it to function abnormally.
Try not to install the exhaust of the heater through the wall of a room with nearby open
windows as the waste gasses may flow back into the building due to drafts and wind
conditions. See above drawings, diagrams and rules for general rules of exhaust spacing in
relation to openings, windows, soffits and doorways. Always check local and State code.
This is why only trained professionals should install any gas-fired device.
The heater is 115V 60 cycles and must be plugged into a ground fault protected outlet as
per code. The outlet should not be directly below the heater in case of water leakage.
Never install the heater above or directly against any other electrical or gas fired device.
INSTALLATION METHODS:
Drill holes on the wall affix as necessary. Use expansion bolts in the upper hole for a
secure mounting. Do not mount the heater to flammable materials. See local and/or State
code. Consult a professional at all times. In many locations, installation must pass the
scrutiny of the local code inspector, if unsure of local rules and regulations; please be sure
to verify the proper way in which to install this heater. This way you can avoid
unnecessary or additional expenses.
The typical proper mounting height is (4 - 6ft above the ground)
No visible electrical wire or any electric appliance is permitted above or below the heater,
the horizontal distance between the heater and any other electrical appliance should be
more than 1.5 feet

NOTICE:
FOR YOUR SAFETY, PLEASE READ THIS MANUAL CAREFULLY AND
FOLLOW ALL DIRECTIONS.
1) Follow all local codes, or in the absence of local codes, follow the most recent edition of
the National Fuel Gas Code, ANSI Z223.1/NFPA 54 in the USA or the CAN/CSA B149.1
Natural Gas and Propane Installation Code in Canada.
2) Properly ground the unit in accordance with all local codes or in the absence of local
codes, with the National Electrical Codes,
ANSI/NFPA 70 in the USA or CSA standard C22.1 Canada Electrical Code Part 1 in
Canada.
3) Carefully plan where you intend to install your Water Heater. Ensure that your heater
will have enough combustible air and proper ventilation and locate your heater where
water leakage will not do damage to surrounding areas. If there is a possibility of water
damage, install a suitable drain pan under the unit which will not restrict combustible
airflow.
Installer must install a Pressure relief valve. Pipe the pressure relief discharge to a drain or
outside environment.
4) Check the rating plate for the correct gas type, gas pressure, water pressure and
electrical rating. If this unit does not match your requirements, do not install.
5) If any problem should occur, turn off all hot water taps and turn off the gas. Then call a
trained technician or the Gas Company or the manufacturer.
NOTE: The installer is responsible for the correct installation of your Water Heater.
Installation and service must be performed by a qualified installer (for example, a licensed
plumber or gas fitter) otherwise the warranty by EZTANKLESS will be void.
6) Read the safety issues completely before installing the Water Heater.
7) This water heater is suitable for residential water (potable) heating ONLY.
DO NOT use this water heater for space heating, combination space heating/ domestic
water heating, or commercial water heating applications.
8) The EZ SUPREME Water Heater is not suitable for use in pool or spa applications.
9) This unit is designed to be installed indoors using the proper vent piping to exhaust by-
products of combustion to the outside environment. Contact your dealer or EZ
TANKLESS for proper vent kits. DO NOT run this unit without OUR ORIGINAL
EQUIPMENT vent piping connected. Exhaust gasses must be expelled outside the home.
10) Maintain proper space around the unit for proper servicing and operation. Minimum
clearances from combustible materials are listed below.
Top of Heater 6 inches
Back of Heater 1 inch
Front of Heater 6 inches
Sides of Heater 2 inches
Floor 12 inches
Vent/Air Intake 0 inches

Model identification information
EZ Official EZ tankless water heater brand
NG Natural Gas (model for this gas type)
LP Liquid petroleum gas “propane” (model for this gas type)

DANGER:
When this heater is in use, there is obviously a combustion process which generates heat to
make hot water. The combustion of almost all combustible materials and flammable gases
of any kind typically consumes a large amount of oxygen and in turn this combustion
process produces many different by-products in the smoke (exhaust) which include
Carbon Monoxide. Regardless of how clean the combustion process is, there are always
exhaust gasses that are emitted at some level. Breathing too much Carbon Monoxide will
cause imminent danger or even death. Therefore, the users of this heater are requested to
install and use this heater strictly according to the warnings set forth in this manual to
avoid possible Carbon Monoxide intoxication. The manufacturer or its authorized
distributors will not be held responsible for any danger resulting from the installation and
operations not in accordance with this manual. Always install a Carbon Monoxide detector
in the area of any gas fired appliances. In fact, this may be the law in your State or town
and failure to do so is in violation of many state and local codes.
WARNING:
This product can only be used after an Official EZ Tankless Direct Vent Exhaust System
is installed.

NOTICE:
This heater is not designed to be mounted in areas outdoors or unheated structures if
temperatures can drop below freezing.
When the temperature of the room in which this heater is mounted drops below freezing
the residual water must be drained from this unit.
WARNING:
FOR YOUR SAFETY, READ BEFORE OPERATING
If you do not follow these instructions exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
A. This appliance does not have a pilot. It is equipped with a direct ignition device which
automatically lights the burner. Do not try to light the burner by hand.
B. BEFORE OPERATING: Smell all around the appliance area for gas. Be sure to smell
next to the floor because some gasses are heavier than air and will settle on the floor.
NOTE:
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric 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.
Use only your hand to operate control keypad. Never use tools. If the keypad doesn’t work,
do not try to repair it, call a qualified service technician. Force or attempted repair may
result in a fire or explosion.
Do not use this appliance if any part has been under water. Immediately call a qualified
service technician to inspect the appliance and to replace any part of the control system
and any gas control which has been under water.

FEATURES:
This tankless water heater uses the Direct Vent Exhaust System. This is absolutely the
safest and most economical ventilation method in use among tankless water heaters. This
method uses a dual-chamber intake/exhaust pipe and a forced air system. This model is
suitable for showering, using the sink, a clothes washing machine or even your
dishwasher. This tankless water heater uses all of the safest and most efficient technologies
available today, making it a leader in its class of tankless water heaters.
DIRECT VENT CONCEPT:
Since this product adopts the method of forced exhaust and fresh air supply for
combustion, this air needed for combustion is completely from outdoors, and the waste
gases produced by combustion are forcedly discharged to the outdoors, therefore, the air
indoors won’t be consumed and polluted. This removes some of the dangerous factors
related to the potential of an insufficient oxygen supply and Carbon Monoxide poisoning.
This model can be installed in the home with a horizontal exit directly to an outside wall.
CONVENIENT ADJUSTMENT:
This heater features a fully automatic ignition that is controlled by a flow sensor, which is
triggered by the movement of water when a faucet or water tap is opened.
Water volume and gas flow are regulated independently, allowing for a very accurate
control of the desired pre-set water temperature. To save energy, to comply with US
federal and state plumbing codes, and for liability reasons, the manufacturer of this water
heater has preset the temperature control to 48C (120F) and this is the default setting. The
temperature can be raised manually for single use purposes, but once the water is shut-off,
the setting default returns to the 120F setting as dictated by state and federal law.
Furthermore, to prevent tampering and danger of scalding, the pre-set temperature
cannot be raised manually when the heater is in operation. The water flow must first be
shut-off before the temperature can be raised via the control panel located on the front of
this unit.
ENERGY SAVINGS AND HIGH EFFICIENCY:
To save energy, to comply with US federal and state plumbing codes, and for liability
reasons, the manufacturer of this water heater has preset the temperature control to 48C
(120F) and this is the default setting. The temperature can be raised manually for single
use purposes, but once the water is shut-off, the setting default returns to the 120F setting
as dictated by state and federal law. Furthermore, to prevent tampering and danger of
scalding, the pre-set temperature cannot be raised manually when the heater is in
operation. The water flow must first be shut-off before the temperature can be raised via
the control panel located on the front of this unit. The burner and heat exchanger are
designed by using an advanced combustion theory, incorporating features of high
efficiency and clean and complete combustion performance.

LOW WATER PRESSURE IGNITION:
In order to meet the needs of well users and those living at high altitudes, we specially
designed a low water pressure ignition for this product.
COMPUTER CONTROL:
Computer controlled ignition and water flow sensor allow for maximum efficiency.
MULTIPLE REDUNDANT SAFTEY PROTECTION SYSTEMS:
Multiple safety protection devices. For example, in case of a sudden flame out or lack of
water supply or electrical power, the systems provide an instantaneous automatic shut-off.
TOUCH CONTROL PANEL SETTINGS:
Design includes easy to operate LCD display of temperature settings, which can be
adjusted using the simple “+” and “-“ buttons. - To save energy, to comply with US federal
and state plumbing codes, and for liability reasons, the manufacturer of this water heater
has preset the temperature control to 48C (120F) and this is the default setting. The
temperature can be raised manually for single use purposes, but once the water is shut-off,
the setting default returns to the 120F setting as dictated by state and federal law.
Furthermore, to prevent tampering and danger of scalding, the pre-set temperature cannot
be raised manually when the heater is in operation. The water flow must first be shut-off
before the temperature can be raised via the control panel located on the front of this unit.
(NOTE: Normal bath water temperature is about 105°F just for your reference.)
NOTE:
This product’s safety features are lab tested. Please be careful and follow all State and
Local regulations and codes when installing and using your tankless water heater.
NOTE:
WATER QUALITY
No manufacturer builds a tankless heater that can hold sediment and mineral deposits
inside. Tank type heaters often have deep sediment loads that build up over years and
accumulate in the bottom of the tank. By design, there is no place in a tankless heater for
this accumulation of sediments and minerals. Over time, your tankless heater will become
less and less efficient unless you address the issue of water quality. This must be done at the
time of installation. Even though you may have city water, there may still be unacceptable
levels of sediment and minerals that can harm your tankless heater in a short period of
time. Consideration of care for your water heater must include evaluation of your water
quality. If the water quality exceeds the target levels provided in this table, to prevent
build-up of sediment and minerals in the interior of your heater, you must pre-treat or
condition the incoming water supply with a filter and/or softener system.

SPECIFICATIONS
Name
Gas-fired tankless water heater
Model
EZ SUPREME
Type
NG or LPG
Gas type
Natural Gas or LPG
Category
I2H
Rated gas pressure
LPG (0.46) (11"wc)/NG (0.29) (8"wc)
Nominal heat input (temperature rise 25OC) Qn
kW
50 (164,000 btu)
Gallons per minute rating
G/min
6.4 GPM @ 45 degree rise (F)
Application water pressure
psi
20 ~ 100 PSI
Energy Factor
.84
Min. start water pressure
psi
20
Electricity power supply
V, Hz
115V～6 0Hz
Maximal input power
W
48
Over current protection fuse
V, A
125V, 2A
Insulation grade
Class I
Electricity and water protection grade
IP44
Ignition method
Water controlled auto- pulse ignition
Temperature control method
Gas proportional valve auto-control
Temperature display
In Celsius (see conversion chart below)
Overall dimensions
inches
D 6.5” – W 15.0” –H 28.0”
Packing dimensions
inches
10.0" x 16.5" x 28.0”
Gas inlet
G3/4 USA
Water inlet
G3/4 USA pipe thread