Honeywell Phenolic Automatic Reset Thermostats, 2455R Series, 2455R--99300021, Switch Type SPST, Automatic Reset, Open on Rise, Contact Type Silver Alloy, Phenolic, 15 A/10 A, B203S, T846, Operating Temperature 0 °C to 150 °C [32 °F to 302 °F], Open Temperature 130 °C [266 °F], Close Temperature 108 °C [226.4 °F], Open Tolerance 4 °C [7.2 °F], Close Tolerance 6 °C [10.8 °F]