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Tankless Coil Water Heaters

Tankless coil water heaters use a space heating system to heat water. They are one type of combo system. Tankless coil systems differ from other space and water heating combo systems in that coil water heaters use the heat from the space conditioning unit, either a furnace or boiler, in contrast to combo systems which use a water heater to provide space heating.

How It Works
A tankless coil water heater uses a heating coil or heat exchanger installed in a main furnace or boiler. Whenever hot water is needed, water flows through the heat exchanger. These water heaters provide hot water on demand without a tank, like an instantaneous water heater, but because they rely on the furnace or boiler to heat the water directly, tankless coil water heaters work most efficiently during cold months when the heating system is used regularly. Thus, they can be an inefficient choice in warmer climates.

Tankless Coil Water Heater

Efficiency
Combination systems are measured by their CAE, combined appliance efficiency rating. Combination appliance efficiency ratings range from 0.59 to 0.90.

Maintenance
Tankless coil water heaters have few moving parts so maintenance and service is less than other types of water heating systems.