Combination Potable and Space Heating Application

Supplemental instructions for gas water heaters installed in potable/space heating applications.

Local codes or plumbing authority requirements may vary from the instructions or diagrams provided in this manual and take precedent over these instructions.

Hot water

supply to

Combination Potable and Space Heating Application

		house
	Hot water
	supply to	From HOT
	heating	From HOT
	heating	outlet on
	unit	outlet on
	unit	water heater
		water heater

Tee fitting for vertical hot water supply lines.

Hot water				From HOT
Hot water				outlet on
supply to				outlet on
supply to				water heater
house				water heater
house

Hot water supply to heating unit

Tee fitting for horizontal hot water supply lines.

Tee fitting must be installed as shown. This ensures that any air in the water lines will be purged through the domestic water faucets and showers.

DANGER: When this system requires water for space heating at elevated temperatures [above 125°F (52°C.)], a mixing or tempering valve must be installed in the hot water supply line to the house in order to reduce the scald hazard potential.

DANGER: Any piping or components used in the installation of this water heater in a combination potable and space heating application must be suitable for use with drinking water.

DANGER: If this water heater is installed in an application intended to supply domestic hot water needs and hot water for space heating purposes, do not connect the heater to an existing heating unit or components of a heating system that have previously been used with a non drinking water system. Toxic chemicals such as those used for boiler treatment may be present and will contaminate the drinking water supply causing possible health risks. Never introduce toxic chemicals, such as those used for boiler treatment, into this system.

Typical Piping Diagram for Combination Potable/Space Heating Installation

Spring loaded check valve in heating	Air vent		Domestic hot water supply
unit hot water supply line and cold
water return line (not supplied with
water heater)			Heat Trap
			Heat Trap
NOTE: This check valve is			6” (15cm)
incorporated in some heating units.			Min.
Refer to the installation instructions
supplied with specific heating unit to
determine if it is required.
		Mixing or
		tempering
		valve (refer
		to warning
		above)	Shut-Off
Isolation valve in hot water supply line			Shut-Off
Isolation valve in hot water supply line			Valve
to heating unit			Valve
to heating unit
(not supplied with water heater)			Isolation valve in cold
			Isolation valve in cold
			water return line from
See diagrams above for proper			heating unit (not
See diagrams above for proper			supplied with water
pipe application for vertical			supplied with water
pipe application for vertical			heater)
or horizontal supply lines			heater)
or horizontal supply lines

Temperature and Pressure
Relief Valve
Gas line to water heater
	Cold water
Water Heater Jacket	return line from
	heating unit
Temperature and pressure
relief valve discharge line	Hot water
	supply line
	into heating unit
	Drain valve
	(not supplied with water
	heater)

Incoming cold water supply

Thermal Expansion Tank (if required-not supplied with water heater)

Heating unit

6” (15cm)Air Gapto Drain

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