... :approved by the international certificated offices ,such as ROHS ,UL ,VDE ,etc. E- series Thermostat features:1) Designed temperature range: -30°C ... /s between two pin.10) Operating life: no less than 100,000times11) Widely used for electric water heater, washer, electric oven ... thermostats are approved by the international certificated offices ,such as ROHS ,UL ,VDE ,etc. Liquid expansion Thermostat