Need to pull the trigger on a heat pump. Was set on the Pentair 125k BTU unit, but am questioning if it is undersized for my 33k gal, 950 sq ft surface area pool in NJ. Is it worth spending over $1K more to get a 145k Heat Siphon or Gulf Stream, or will we be just as happy with the heat provided by the Pentair unit? Is the extra 20K BTU and few points of COP worth it in reality for my part of the country?