These thermostats have a special design that ensures trouble-free continuous operation at temperatures up to 350 °C. They are built in stainless steel, with a glandless pump, a visual level gauge and a temperature limiter. If required, an expansion chamber containing a float switch can be fitted.

A double layer of heat transfer fluid in these thermostats suppress the oxidative decomposition of heat transfer fluids over 200 °C.
Marlotherm SH® Dowtherm® or low viscosity silicone oil can be used as heat transfer fluids.

These basic units are fitted with one or two 2 kW heating elements.