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Old 05-10-2010, 08:16 AM
Senior MemberCaptains Club Member
Join Date: Feb 2002
Location: Saugus, Ma. USA
Posts: 12,168
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I spend countless hours researching this when faced with the same issue. I looked at propane, natural gas, and heat pump. I went with a heat pump + solar cover for a number of reasons. It makes the most sense in the northeast.

Heat pumps are basically nothing more than a reverse cycle air conditioner. They are expensive to buy and slower to heat the pool, but they are far cheaper to operate than natural gas. Propane is even more than natural gas, and resistive electric heat would be insanely expensive.