Does anyone use only solar to heat their spa and have no gas heater? We would like to skip the propane heater on the spa to save money and energy. We are in the Austin, Texas area and have lots of sun, so I think our climates may be similar.
We are going to have a 7 ft square spa, next to the pool, completely in ground, with spill over into the pool when in recirculating mode. As I understand it, when we put it in spa mode it does not recirculate to the pool.
Can you run the solar till the sun goes down to keep it at a certain temperature, then how many hours later can you still use it?
In April our average temperatures are highs in the 70s lows in the 50s. Will the spa get hot in April?