The VAQ series air handler is designed primarily for upflow installations but can be used horizontally in attics and crawl spaces with the addition of a field installed horizontal drain pan. Each air handler includes a evaporator coil, a separate hot water coil, circulating pump, air purge valve, hot water check valve, 120V blower motor, throw away filter, and 24V transformer. This air handler converts a properly sized gas or oil-fired water heater into a highly efficient, multi – purpose appliance that can heat an apartment, condominium, or home in addition to providing domestic hot water. When space heating is needed, the wall thermostat energizes the circulating pump which circulates hot water from the water heater to the hot water coil in the air handler. As the fan motor forces cool return air from the home over the hot water coil, the air absorbs heat from the hot water, the warm air is then circulated throughout the duct system and into the home.