
HARDY MANUFACTURING CO., INC (MODEL C3 & C5) PAGE 19
3-4
Plumbing for Domestic Water C3 & C5
To add domestic hot water to the Model C3 & C5 heaters, a plate heat exchanger and
pump can be added. This plate heat exchanger will provide preheated water to the
domestic hot water. The preferred method is to mount a plate heat exchanger at the
water
heater
and connect it as shown in the following picture. The pump will circulate
heater
water through the plate continuously. The cold water supply will need to be
connected to the opposite side of the plate heat exchanger and flowing in the opposite
direction for maximum efficiency. The alternate method would be to mount the plate
heat exchanger on the back of the furnace and connect the water heater to the plate
the same way as in the preferred method with counter flowing waters.
Water pipes must be designed for hot water service (ex. copper, cpvc, or Pex.)
Pipes should be installed in a 4” watertight pipe or some other type of insulating
means to prevent heat loss from heater to heating system. Use only copper,
brass, or stainless steel fittings. Do not use galvanized or black iron.
Cold Water Supply
Water
Heater
Hot Outlet
Cold Inlet
!
DANGER
Water Temperature
over 125 degrees
can cause severe
burns instantly
Heater with Hull and stacks
removed to show connections.
H300.02
20 Plate
Heat Exchanger
w/ 3/4" fittings
Close this
valve.
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