6 pole connection. 120V, 208V, or 240V. Also used for double element heaters that are wired for simultaneous operation. Replaces No. 7025, and 8025 with E.C.O. attached and replaces No. WH2-4 or WH5-4, or WH7-2, or WH7-4. Can be used to replace thermostats on most residential electric water heaters. Thermostats are set at 120 deg. F. and are adjustable between 110 deg. F. and 160 deg. F. Thermostats include a Safety Energy Cut Off (E.C.O.), that cuts off all power to the heater should internal tank temperature reach 190 deg. F. (The 9000507, Lower Thermostat, does not require an E.C.O.) Thermostat and E.C.O. are UL listed. Fits water heaters with Apcom, Robertshaw, and Therm-O-Disc thermostats.