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a year or so back the Farm Show magazine had an artical about a product that was a propane powered block heater, basically a very small propane water heater that had two hoses on it with hydrolic quick connects (high pressure with valves that close when you pull the hoses apart), I have thought that a system like this that would hook in to a heat exchanger on your hot water heater in your house and a small pump that would pump hot water in to your engine would work well and with the heat exchanger you could keep your antifreeze without risking a spill.
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