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VIII) COMBINATION POTABLE WATER
HEATING AND SPACE HEATING
(COMBO HEATING)
This section serves as a guide for the installation and use of
“Combo” heating systems utilizing a domestic water heater which
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.
Caution: READ BEFORE PROCEEDING
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.
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,
CGA B149, NFPA 54, 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 local jurisdiction require a back-flow preventer in
the cold water line, an expansion tank of adequate
size must be installed.
8. To reduce the scald hazard potential, a mixing valve
must be installed.
INSTALLATION
The installation of the water heater must follow sections I to X
in this manual. The heating mode may be one of the following
options:
A- A fan coil (air handler)
B- A hydronic baseboard (finned tube) loop/ In floor heating
A- Fan Coil (see figure 13)
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.
B- Baseboard Radiator Heating (see figure 13)
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) A drain valve must be installed at the lowest point of
the heating loop so that water can be drained from
the heating module without affecting the water
heater.