Originally Posted by GOTTOYS
All electric heaters are 100% efficient and they all produce the same amount of heat for the same amount of electricity used. 1500 watts input = 5,280 BTUs of heat period. Doesn't matter what device you use Eden Pure or milk house heater. Same output. Drawbacks to using electric is there is no heat circulating in the underbelly from the from the furnace. If you have to pay for your electric you will find it's cheaper in most cases to use your furnace..
One other thing to consider is that the 1500 watts is at some fixed voltage, usually 120 volts. Since the wattage load is a fixed "resistive" load, lower incoming voltages (occasionally found at campgrounds) result in lower BTU output.
E=IR - volts=amps times resistance
P=IV Watts = amps times volts
A 1500 watt heater draws 12.5 amps at an incoming voltage of 120 volts.
120 volts /12.5 amps = a heater with a thermal circuit of a constant 9.6 ohms
So if the incoming voltage drops to 110 volts due to everyone on the camp ground's power circuit using electric heat and AC water heater, the maximum wattage available to make heat drops.
110 volts/9.6 ohms = 11.45 amps.
11.45 amps * 110 volts = 1260 Watts
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