Here is a short update on the FPH. I would say it makes about a 5 degree difference for me on average. Which for me has been great. There is a huge different between a 72 degree pool and a 77 degree pool. In Michigan the past week it has been cool at night and high 70s during the day. Without the pool heater my pool was around 72-73 in these conditions. With the pool heater it is around 77-78. During the really warm months with AC running a bunch and outside heat the pool was an 88 degree spa. So for making the pool nicer during swimming months it works great. Basically no chance of this thing really extending my season at all. Which is fine for me. Spent enough money on stuff that closing up the pool now doesn't bother me. But had lots of fun in the hot July months with a super toasty warm pool when last year even in July it would barely touch 80.