Engine Heater SafeStart 500 series

Special flange heaters

Heaters in the 500 series are manufactured with special flanges designed for engines with caps instead of frost plugs between the engine and the coolant tank.


Heaters with special flanges or special fasteners are identified with the DEFA number series 501-2599. Some engines have one of several types of caps instead of a frost plug between the engine and the coolant tank. DEFA manufactures a flange for these heaters which is identical to the original cap. The heater is fastened with bolts. A gasket or an O-ring is used to form the seal. A heater with flat or head-shaped flange, which is fastened with a holder, is also available.

Engine pre-heaters are supplied separately because of specific necessary adaptations to each individual engine and vehicle type.


Normal usage – DEFA engine heaters are designed for “normal usage.” DEFA defines “normal usage” as; 3 connections for 3 hours pr. Twenty-four hours for 150 days (5 months) a year.

Professional use – For use emergency vehicles or other vehicles where the heater is in use continually, yearly controls are necessary. It might be required to install a replacement heater. DEFA AS will not cover the yearly service cost.

NOTE! Pulse power – Some parking facilities use interval (pulse) power timers that turning the power On and Off several times per hour. Using a DEFA engine heater in combination with these timers is NOT considered “Normal use” and claims will be declined.

Technical description

Up to 25-pack, depending on the size of the heater.

DEFA AS conforms to the requirements of both ISO 9001- 2008, ISO 14001:2004 and OHSAS 18001:2007. In addition, our engine heaters and cables conform to the requirements of ISO/TS 16949:2002.

IP rating