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The 12 volt heater will probably exceed your 20 amps. Why not use a hot water small tractor universal heater. You have a water cooled engine with an unlimited supply of free heat. The fan on one of those will work well with the current alternator. There have been several posts on using electric heaters in the Hydrostatic section of our forums. A couple of guys have had some success with them using them with a portable gas powered generator hooked to the back of their tractor. Welcome to WFM. Roger