There are several variants of the motor:

- Transparent with green hard PVC spiral

P4 or P5 series

the ball valve must be replaced urgently

Sicherheitstemperaturbegrenzer (STB) Kessel oder Brenner Selection of variant:STB burner as a retrofit kit There are several variants ofIf there is excess temperature in the boiler (e. g. if the pump fails), the safety temperature limiter is triggered and interrupts the pellet supply. Only after the boiler has cooled down can the STB be unlocked mechanically (manually). There are three variants to choose from: STB for the boiler STB on the burner STB on the burner as a retrofit kit (incl. instructions) The STB for the boiler is installed as standard as it is required by law. The STB