On the other hand, devices that don’t spend a lot of energy – something like battery-powered portable air conditioners – have a low COP. The high COP of such a heat pump is essential for electricity cost-optimization. Bigger ones with 15+ GPM can consume as much as 36 kWh every hour. For example, the best tankless water heaters are known to have a high coefficient of efficiency.Įxample: Even a small electric tankless water heater is powered by 9,000W. It’s much better to have a COP 3.5 water heater than a COP 2 water heater. COP 2 heater will boil a gallon of water for more than 1 cent. On average, a COP 3.5 heater will boil a gallon of water for less than 1 cent. Running a 1000W heater for an hour costs about 13 cents. It will boil almost 10 gallons of water per hour.įor comparison: A 1000W heat pump with a COP of 2 will boil less than 6 gallons of water per hour.ĭo keep in mind that the amount of electricity used is the same in both cases. That’s a highly energy-efficient heat pump. That means that we power it with 1000W, and the heat pump gives us back 3500W worth of heat. Example: We have a 1000W heat pump with a COP of 3.5.
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