I've used a Heat Siphon for our AG pool in northwest Washington state for a couple of years now. True, you have to run it a lot to get up to temperature. However, once at temp. it maintains our pool nicely. We're swimming in 90 degree water while the air temperature is only in the mid 60's right now. Up front cost was a lot, but it only costs us about 35 dollars a month to heat our pool during the summer (we have a pretty short season and in western Washington you have to heat even in the summer).
If you're looking for a quick temperature spike, propane or natural gas is better. But if you're patient and want to save a lot of money over time, the heat pump is great. Good luck whichever way you decide.
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