Tankless Heater?

[Sunny35]

Hi all,

I'm new here and looking for some suggestions....
Anyone using a tankless heater to heat their pool? I have an 18 ft above ground. Solar covers does a good job for the most part, but after a rain I'm looking for something to take the chill out. Propane heaters are cheap, but propane isn't (no access to natural gas). Can't afford $2500 for a heat pump. Thanks for any advice.

[Meto]

Try Solar in a Box you will have to search for them online or build your own