3.10 Venting
Improper venting of combination water heater can result in excessive levels of carbon monoxide which
can result in severe personal injury or death. This combination water heater must be vented in
accordance with the “Venting of Equipment” section of the latest edition of the ANSI Z223.1 / NFPA 54
Natural Gas Code and/or the “Venting systems and air supply for appliances” section of the latest
version of the CAN/CSA B149.1 Natural Gas and Propane Installation Code in Canada and in
accordance with all applicable local building codes.
Venting Guidelines
• For best results, keep the vent system as short and straight as possible.
• Locate the combination water heater as close as possible to the vent termination.
• The combination water heater vent must not be common vented with any other gas appliance or vent stack.
• Slope vent upwards towards the vent terminal at a rate of 1/8” per foot (1% slope).
• Vent termination must be a minimum of 12” above grade or expected snowfall.
• Vent and air intake pipe must be supported every 4 feet of horizontal run and every 5 feet of vertical run.
FLOWMAX and Direct Vent
• All FLOWMAX Combination Water Heaters are prepared at the factory to be direct vent (sealed
combustion) units which draw all of their required combustible air directly from outside the building.
• All FLOWMAX Combination Water Heaters use 2” or 3” diameter exhaust and 2” or 3” diameter air intake
pipe.
• The air intake vent materials can be made of ABS, CPVC, PVC materials and in accordance with all
applicable local building codes.
Contaminated Make-Up Air Will Damage the Unit
• Recommend not to operate the combination water heater in an area that is or will be under construction or
renovation.
• The FLOWMAX warranty will not cover damage and premature wear caused to the unit due to installation in
a contaminated environment.
• All of the exhaust venting connections must be leak checked with a soap solution upon initial start up of the
water heater. Any leaks must be repaired before continuing operation of the water heater.
• Warranty will not be available if the water heater is used for construction heat.
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