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Is a space heater more efficient on the 800W or 1500W setting?
Gadget45
Efficiency has nothing to do directly with the wattage selection. Efficiency would be calculated based on the amount of power used to deliver a specified amount of heat. In your case you have stated the power requirements by indicating 800 and 1500 watts are available. Assume the1500 W setting gets to your desired temperature in 5 minutes and then cuts off and the 800 W setting takes 9 minutes.
If the heater delivered the exact amount of power of the setting then if it took 5 min at 1500 W. it should take (15/8) x 5 = 9.375 min at 800 W. If the 800 W setting got to the heat setting desired in anything under 9.375 min you could say the 800 W setting was "more efficient". Any anything over 9.375 "less efficient".
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