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Block Heater 200

posted by  don paulsen on  Fri Aug 9 17:37 CST 2002
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last visit: Sun Jul 8 14:48 CST 2001
[RELATED]

I've never seen a 12 volt block heater. Volvo has one that replaces one of the freeze plugs on the exhaust side of the engine. It's probably a couple hundred watts. Maybe you could get a ac/dc inverter that could power a 400 watt heater, but on a 12 volt system, I think 400 watts would draw 33 amps (400/12) which would completely discharge a large, healthy battery in about an hour and 1/2, maybe less time if it's really cold out. I had an old Mercdes diesel 220, with a 500 watt block heater, which had to be plugged in at least 2 hours before the temp gauge would move off the bottom peg.
Stay away from dipstick heaters, too. You're better off heating the coolant which will heat the block better than cooking your oil.






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