SmartVent Tempering Heater for Home Ventilation 1kW SKU: 240329 MODEL: DCT1226 Error. try again later You've successfully joined the club $ 679 each Mitre 10 SAvailable at selected stores. Check your local store for details Variants A tempering heater is an element inline heater designed to temper the incoming air in home ventilation systems. This 1kW heater is suitable for use with 150mm systems. Features and benefits Tempering heater are used to help take the chill off incoming air , thus allowing the occupants more comfort when roof temperatures are low (not a home heating solution).