Hi Being up here in Maine, we are very familiar with what we think is the fool proof winterizing method. After bypasing and draining the hot water heater, We blow the system out then use a 5 gal bucket with a sump pump (house hold submersible) and fill it with pink. We attach it to the city water inlet and pump thru out the whole rig. After that a small amount thru the internal pump and we are done. 20 minutes tops. We do hundreds of boats and rvs each year and have never had a problem. Oops never should have said that. Hope it dosen't bite us. Dan
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