Hello there TFB,
Someone in my area is selling an 8yr old aquacal heat pump. Only information he gave me was T85 Aerotemp. Im installing a freeform 14x22 freeform radiant and looking to heat the pool. He is selling the heater for $400 possibly negotiable. It is currently disconnected due to a pool collapse over the winter. I am not really sure what to look for when inspecting. I asked about the condition and of course he would say it was good and that it was running fine last season. Any advice would help.