I also would like to know. I have a 18 x 24 above ground pool under a shade tree with a 60% shade tarp and need a pool heater. With so many brands and types of heat pump & different types of heat exchanger, which one do you buy.
One brand says life time warranty, but whats considered a lifetime for a heat exchanger. (Rigid Tools gives a lifetime warranty on their drills, and saws, etc. but then you find out lifetime means the life of a cordless drill which they think is only 7 years, not your lifetime, but they don't tell you that when you buy it).

Another brand says all titainium while another says glass coated " chemicals never touch the metal" so confusing. Which one is the quitest, which one is the most efficient, which one stands behind their warranty the best, which one uses the least electricty, which one breaks down the least, etc.

Any one have expierence with these, any knowlegeable distributors out there that really know these things? I already decided electric heat pump, but which brand is killing me.