I build pools and have done a few Pentair Thermalflo heat / chill pumps, which are not any more costly. They heat (in the winter time) and they cool (for those hot summer months). They are very reliable, easy to operate and come with Pentairs best service people, if ever needed.

I have a great deal of experience with both the Pentair (ultratemp, stay away from thermalflo) units and Aquacal. They both work as advertised with a very low failure rate.

Aqua Comfort is also worthy of consideration.

Scott

I have put in quite a few of the Ultratemps, and have had no issues, and good results. Best of my knowledge Pentair doesnt sell the Thermalflo anymore, only the Ultratemp now. That doesnt mean there is not one on somebody's shelf somewhere.