Raypak E3T Electric Pool & Spa Heater 1 Ph 27kW 240V 100-10000666The Raypak 100 10000666 E3T is what you install when you want electric heat that holds up to saltwater and doesn't fight you on setup. At 27kW running on 240V single phase, this is the top end model in the E3T lineup and the one most pool owners reach for when they want real heating performance instead of a glorified spa warmer. Inside, the heating element is titanium. The housing is 316L stainless steel. Both materials are there for one reason: