Hydro-Quip – Heater, LowFlow, Watkins, 230v, 4.0kW, Auto Reset – C3564-2, 26-C3160-2S. This is a generic replacement for the various versions of Watkins/Hot Spring/Tiger River/Hot Spot/Caldera OEM Heaters. Also for the Laing Tri-bend heater. This heater includes 2 sensors with new style 4-pin sensor plugs (2002+) and an auto-reset high limit. Heater does not contain connection for a pressure switch. Utilize Watkins jumper (72768) to bypass.