SmartVent Tempering Heater for Home Ventilation 2 x 1kW SKU: 236458 MODEL: DCT1491 Error. try again later You've successfully joined the club $ 1,174 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 2 x 1kW heater is suitable for use with 2 x 200mm 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).