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Heat Pumps vs Electric Resistance Heaters: The Real Efficiency Gap
Heat pumps move heat instead of making it, which is why they use far less electricity for the same warmth. Here’s the honest comparison.
WaterFuelAndSolarEnergy.com Editorial Team Updated December 2024 7 min read
An electric resistance heater turns 1 kWh of electricity into about 1 kWh of heat. A heat pump can deliver 3–4 kWh of heat from the same 1 kWh, because it moves existing heat from outside instead of creating it.
Heating technologies compared
| Technology | Efficiency (COP) | Best for |
|---|---|---|
| Electric resistance | ~1.0 | Tiny, occasional loads |
| Air-source heat pump | 2.5–4.0 | Most homes (space + water) |
| Ground-source heat pump | 3.0–4.5 | High heat loads, new builds |
The catch: climate and size
Heat-pump efficiency drops in extreme cold, and a system sized as both heater and air conditioner must be sized correctly for both. Good design matters more than brand.