Engine Heater SafeStart 400 series

Hose heaters - no thermostat

Hose heaters in the 400 series (except 420-423) have flanges shaped like a metal pipe and a built-in thermostat


DEFA has focused on easy installation and optimal heating functionality during the development of engine preheaters. For different engine and vehicle combinations, DEFA has nine primary heater elements with more than 500 variants and over 5000 individual applications.

The flange in 400 series heaters (except 420 – 423) consists of a metal pipe. This pipe can surround all of, or parts of, the active element. The heater is placed in a specified location in one of the engine’s water hoses, end on end with a metal component, such as on the water pump. In this way, the entire active part of the element is surrounded by metal.

Usage definitions

Normal usage – DEFA engine heaters are designed for “normal usage.” DEFA defines “normal usage” as; 3 connections for 3 hours pr. 24 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 necessary 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 26-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