We built our 9k pool last year and were advised to get an Ultratemp heater/chiller instead of a straight heater because I have dark plaster, it is a small pool they assumed I’d need to chill in the summer. Not the case. I want my pool to be heated as a hot tub, so around 100. The hp only raises temp about 1 degree/hr so I want to add a ng heater. Will this work in conjunction with the hp? Is it really an “add” or a replacement? Any suggestions on exactly which heater to get?