4.0kw 240v flo thru style heater assembly most commoningly used on Hydro-Quip systems. 2 mounting studs, thermo-well grooves with cover, surface mount high limit studs, 1/8" pressure tap and 2" heater tailpieces.Replaces part number 20-00278-CManufacturer: Therm CoreMPN: C2400-0309