Eberspacher EasyStart T - 7 Day Timer suitable for 12v or 24 Volt installations Great for heater error code reading and clearing heater faults  Electrical plug and connectors supplied for easy installation or upgrade Compact dimensions - 36mm x 51mm x 10.5mm Operating and Installation instructions provided in box Suitable for many Eberspacher water heaters including Hydronic D4W SC Hydronic D5W SC Suitable for many Eberspacher air heaters including Eberspacher D5LC air heater - in combination with room temperature controller Eberspacher D8LC air heater - in combination with room temperature controller Eberspacher D2 Airtronic heater - interior temp control may require additional room controller (heater age dependent) Eberspacher D4 Airtronic heater - interior temp control may require additional room controller (heater age dependent) Please enquire with our Technical Sales dept if unsure Should be used in conjunction with a modulated temperature control or remote room sensor when fitted within air heater installations