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VI) COMBO HEATING

WARNING

Keep the area around the heater clear and
unobstructed.

This section serves as a guide for the installation and use
of “Combo” heating systems utilizing a domestic water
heater that has been specifically approved for such use. It is
written for those knowledgeable in the required trades and
professionals involved in the design and installation of Combo
Heating Systems.
It is the responsibility of the installer/designer to follow all
applicable codes to ensure the effectiveness and safety of
the installation.
This appliance has been design certified as complying with
American National Standard/CSA Standard for water heaters
and are considered suitable for Water (Potable) Heating and
Space Heating.

Note:

This water heater may be used in

combination potable water/space heating system. Do not use
in a space heating only application.

Toxic Chemical Hazard

WARNING

•

Do not connect to non-potable water system.

Read Before Proceeding

CAUTION:

Keep safety your first priority. Take all pre-
cautions to avoid creating a fire, health or
safety hazard.

The following requirements must be met for the installation
of Combo Heating Systems:
1. All components used for the distribution of water in the

heating loop must be suitable for potable water. These
include all piping, fittings, solder and fluxes, pumps for
circulation of water, valves, etc.

2. The water heater must not be connected to a hydronic

heating system that has been used previously with non-
potable water.

3. No boiler treatment chemicals of any kind shall be

introduced into the system.

4. The Combo System components must be selected

and sized to meet and maintain the total calculated
demands for both domestic service hot water and space
heating requirement. The sizing and installation must be
performed in accordance with good engineering practice
such as

“ASHRAE Handbooks”

HRAI

“Hydronics

Institute Manuals”

B139

NFPA 31

ANSI Z223.1

CSA F280

National/Provincial Building Codes

CSA

C22.1

ANSI/NFPA 70

CSA B51

and/or codes having

jurisdiction.

5. The air handler (fan coil) and/or the circulating pump

in a baseboard hydronic loop will require a dedicated
120V circuit. This must be provided and identified for
this purpose.

6. All piping between the water heater and the air handler or

hydronic baseboard loop must be adequately insulated
to reduce heat loss.

7. If the local jurisdiction requires a back-flow preventer in

the cold water line, an expansion tank of adequate size
must be installed.

8. “Combo” Heating Systems require higher water

temperatures than other applications. When the system
is used to supply water for Combo Heating applications, a
means, such as mixing valve, must be installed to temper
the water in order to reduce scald hazard potential (see
Figure 19 through Figure 21).

Installation

The heating mode may be one of the following options:
1.  A fan coil/air handler (Figure 19).
2.  A hydronic baseboard (finned tube) loop (Figure 20).
3.  A hydronic in-floor heating loop (Figure 21).
The following is a list of requirements for the installation of
the heating loop to the water heater.
1.  Install shut-off valves and unions so that the water heater

can be isolated from the heating module should servicing
of the water heater become necessary.

2. Install a drain valve at the lowest point of the heating loop

so that water can be drained from the heating module
without affecting the water heater.

3. If the air handler does not have a venting means at the

highest point of the piping arrangement, install an air
bleed at the highest point of the plumbing arrangement.

4. If solenoid valves are used for zone heating applications,

they must include electrical proof of valve full open
position and must be connected to the water pump.

WATER

HEATER

8 in. TO 12 in.

HOT

OUTLET