Which type of supply air heater is the better choice?
Enervent air handling units have very efficient heat exchangers, so the supply air heater is only needed for the few coldest days. In relatively warm climates, such as in Southern Finland, the water circulated heating coil is usually not the cheapest option due to the high installation costs and low usage annually. The electric supply air heating coil is the better choice in these conditions. Supply air heating is more needed in colder climates and then the water heating coil is generally the better option.
