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Originally Posted by wobombat
I've heard horror stories of block heaters creating insanely high electrical bills.
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What? Sure, maybe from doofuses who leave them plugged in all the time.
A "powerful" block heater may be 1000 Watts (1 kw). 1 hour is sufficient to pre-warm an engine (outside of Alaska). How much do you pay for 1 kWh of electricity? 10 cents?
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I imagine that the bill for operating a block heater would be much larger than the loss of running an engine rich for an extra minute or so.
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Depends on the vehicle and trip length (the shorter the trip, the more potential savings).
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low cost
The study found that for vehicles with a block heater connected for just three hours prior to being started, electricity costs over a 112-day winter were between $10 and $25, depending on the vehicle model. During that same period, the net fuel savings ranged from $20 to more than $40.
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source:
CAA-Québec - Block heater: get connected!