Timeguard STBT4 Boostmaster 2 Hour Electronic Boost Timer The STBT4 is a boost timer for immersion and room heaters. Simply press the button to increase the ON time for up to 2 hours. 13A (3kW) loading. Easy to use push-button control. Power status LED indicator illuminates boost button ON time can be increased in 4 steps: 0.25, 0.50, 1 and 2 hours. Fits standard flush or surface mount boxes min 25mm deep Technical Specification Timer Mode: Boost Setting Type: Digital Operating Voltage: 230V AC Switch Rating: 230V AC,13A Resistive (3kW) Operating Temperature: -10 to 40°C Cable Connection: 1.5 x 2.5mm Flexible Cable EC Directives: Conforms to Latest Directives Dimensions: Width 85mm, Height 85mm, Depth 31mm Comes with a 3 Year Guarantee User Manual