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On-Demand Water Heater Installation Manual and Owner’s Guide
17
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The guidelines in this section apply to installations within the United States. All U.S. installa-
tions must conform to the National Fuel Gas Code, ANSI Z223.1/NFPA 54 (current edition) and
local codes.
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Canadian requirements differ from the guidelines in this section. In Canada, follow the
requirements of B149.1 (Natural Gas and Propane Installation Code, current edition) as well as
local and provincial codes. Contact your local code enforcement agency for direction.
NOTICE
This gas water heater requires an adequate source of clean air for combustion and ventilation.
Without sufficient air, your water heater may not operate properly and may emit excessive and
abnormal amounts of carbon monoxide which may result in carbon monoxide poisoning or
death.
WARNING
Before installing the water heater, you must determine the amount of air needed to supply this water heater and
any other gas appliances in the same area and provide adequate air for combustion and ventilation. Consult a qual-
ified person if you’re unsure of the proper way to supply air to your water heater.
Check for Chemicals:
Air for combustion and ventilation must be clean and free of corrosive chemicals. If corrosive chemicals, such as
sulfur, flourine, or chlorine are present, the water heater must be direct vented. Failure due to these corrosive
chemicals is not covered by the warranty.
WARNING!
In all cases, ensure that corrosive chemicals are not present at the air intake. Presence of such chemicals at the air
intake could result in death, personal injury, or property damage. Examples of locations that require outside air due
to chemicals include:
• Beauty salons
• Photo processing labs
• Indoor pools
•
Laundry, hobby, or craft rooms
• Chemical storage areas
Products such as aerosol sprays, detergents, bleaches, cleaning solvents, gasoline, air fresheners, paint and varnish
removers, and refrigerants should not be stored or used near the water heater.
Does your installation space have sufficient combustion air?
Ventilation with outside air is recommended for all installations. Even if the water heater is installed in a large,
open room inside the house, outdoor air is usually needed because modern homes are very tightly sealed and often
do not supply enough air to the water heater. However, when installed in a large indoor space, it may be possible
to provide enough air without outside ventilation. If you are unsure if your installation location has enough ventila-
tion, contact your local gas utility company or code officials for a safety inspection or direct vent the water heater
The following instructions will help determine if it may be possible to install the water heater without outside venti-
lation.
Calculate total BTU/h rating of all appliances.
To calculate the combustion air and ventilation required, add up the total BTU/h ratings of all gas burning applianc-
es (e.g., water heaters, furnaces, clothes dryers) in the same area. Do not include appliances that are direct vented.
Refer to the following example.
INSTALLATION
Step 6:
Combustion air supply
Step 6:
Combustion air supply
Summary of Contents for 160X3P
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