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I put in an OEM block heater on my Avalon, and it only heats it some 30 °F (17 °C) difference compared to ambient temperatures. It can also get down to -40 °F (-40 °C) here.
I want to put a 1,000W or 1,500W circulating block heater. But I want to get a 120V pump to go with it since trying to hook one up so it circulates via temp differences and boiling is a bit of a pain on a new engine and a way to make coolant bypass things it shouldn't.
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