Water heaters
Water heater types
System type, energy source and venting category are three separate things. Start with the type; each page explains how it works, what its capacity figure really means, and which models are documented.
Gas storage tank water heaters
Natural gasPropaneThe conventional water heater: an insulated tank of 30 to 80 US gallons heated by a natural gas or propane burner underneath, vented by natural draft, power vent or direct vent. Sized by first-hour delivery, rated by UEF.
36 model(s) documented
Gas tankless water heaters
Natural gasPropaneWall-hung units that heat water only while a tap runs, with inputs up to 199,000 BTU/h. Capacity is a flow rate at a temperature rise, not a volume; condensing models reach UEF 0.90 to 0.98 and vent in PVC.
13 model(s) documented
Electric storage tank water heaters
ElectricInsulated tanks heated by one or two immersion elements on a 240 V circuit, with no venting or combustion. Simple and inexpensive, with slow recovery compared with gas.
4 model(s) documented
Heat-pump water heaters
ElectricElectric storage tanks with a small heat pump on top that moves heat from the surrounding air into the water, using a fraction of the electricity of resistance elements. Needs air volume, a drain and a suitable circuit.
3 model(s) documented
Indirect water heaters
Natural gasPropaneElectricStorage tanks with an internal coil heated by a space-heating boiler rather than their own burner. The boiler's energy source heats the water; the tank itself has no flue. Common in Metro Vancouver homes with hydronic heating.
4 model(s) documented
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