These units were fitted to many gas boilers in the commercial sector.

Potterton Derwent.

Chappee Edena & Edena 2 Part ref: S170271FA

Ideal Standard Altais 2ST

These parts are no longer available, so we manufacture a replacement module which performs exactly the same functions as the original. The unit is a little larger than the original BZG3 and will require some cutting of the metal plates in some boiler models. Instruction sheet supplied showing connection details.