Engine Heater SafeStart 700 series

Hose heaters - no thermostat

The 700 series is made up of a series of hose heaters with a thermostat, and a series of hose heaters without a thermostat.


Heaters in the 700 series are divided into two groups:

A. Heaters without thermostat

These heaters are identified with the DEFA number series 701-709 and 758-799. The heaters consist of a heating element and a coolant chamber with intake and outlet connections for different hose dimensions. Heaters 758-799 do not have a thermostat and are suitable for various types of installation methods (hoses, T-connectors, hose clamps, etc.). They are usually installed in a hose on the oil cooler or in a hose for the internal vehicle heater

B. Heaters with a thermostat.

Heaters from number series 710 and 757 consists of heater 715 and different mounting components (hoses, clamps, etc.) It consists of a water chamber with a heating element and an electrical connector housing. It is designed for 5/8” (16mm) water hoses. These heaters are equipped with a thermostat that regulates the coolant temperature and switches off the power supply to the element when the coolant has reached a temperature of 80°C at the intake/outlet of the heater. The thermostat switches the heater back on at 70°C.

Heaters from number series 721 – 734 consists of a coolant chamber and a power connection box. There are two two-phase thermal fuses and a thermostat in the connection box which measures the temperature on a metal plate between the connection box and the coolant chamber. The fuses in the heater prevent the heating element from failing due to overheating.


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 per pack, depending on the size of the heater.

See separate product sheet for the 721-734 heaters.

Required and adapted connectors, screws and hoses are supplied with 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