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HayZee,
It is the Lennox complete heat HM30 system. It pulls the hot water through the heat exchanger and uses the heat from the water to circulate warm air through the house vents. I am not sure if it has 2 stage heat (primary and auxilliary) heat or not. The main problem is the thermostat will not cut the heat on or off after it has reached the desired temperature. I can set the fan 'ON' switch on and reset the breaker for the thermostat and the blower fan motor and then it will come on. It will not cut off however and the breaker has to be tripped again to cut the heat off.
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