... 2.Certification:VDE TUV UL+CUL 3.Rated: KSD301-PR-BH Boiler thermostat switch,High Quality,Competitive Price!Key materials imported ... user's requirements)b) Open Tolerance: ±2°C, ±3 °C, ±4 °C, ±5°Cc) Open & Close Tolerance: 5 °C -60 ° ... Cd) Close Tolerance: ±2°C, ±3 °C, ±4 °C, ±5°C, ±10 °C6.Normal Electric Strength: Not Broken ... Size:0.48m*0.34m*0.24m KSD301-PR-BH boiler thermostat switch