Hardy H25, Installation And Operating Instructions Manual

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THE HARDY OUTSIDE WOODBURNING HEATER
How does an outside heater heat my home?
The Hardy outside wood heater is designed to save the most energy and provide the most
comfortable heating available. It heats your home by heating a stainless steel tank filled
with water, which surrounds the firebox of the outside heater. The heater is basically a non
pressurized boiler with an atmospheric vent. This hot water is then circulated through
underground hot water pipes to a water coil inside your existing central duct system. The
Hardy Heater can be connected to any existing hydronic heating system that operates at
180 degrees or less.
How does THE HARDY heat water for household use?
A plate heat exchanger (optional) is installed in the hot water circulator line. When you
open a hot water faucet inside your home, the cold water passes through the other side of
the heat exchanger and the water going to your hot water heater is preheated. The only
energy required is maintaining the hot water temperature. The plate heat exchangers can
be used for pools, dairies and other domestic hot water needs.
How do the Thermostat Controls work?
The only visible addition to the heating system inside your home is the thermostat which is
located neat the existing thermostat. The two thermostats are installed so that if the
outside wood heater is not in operation, your existing unit will automatically take over to
maintain your household temperature. The wall thermostat which regulates the heat from
the outside heater performs two functions; when it senses your need for heat according to
your temperature setting, it turns the water pump on to circulate the hot water through the
coil and also turns the blower on inside your central unit to force air across the hot coil.
This forces hot air into your central duct system. The outside heater has a hot water
thermostat which senses the water temperature of the unit. If the water is not as hot as the
thermostat setting then the combustion air intake is automatically opened and remains
open until such temperature is attained.
Where should an Outside Wood Burning Heater be located?
The outside unit should be located at least 10 feet from your home so that all fire danger is
removed from your home. The unit may be installed as much as 100 feet away and still
heat your house and hot water. If the unit is located more than 100 feet away, you may
experience some heat loss on the water going to your water heater. Locate the outside
wood heater where it will be convenient for refueling and wood storage. All water and
power lines are installed underground between the house and the outside wood heater.
(MODEL H25)
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