Glow-worm 801635 heat exchanger door seal

This Glow-worm door seal is a spare part for the heat exchanger of CXI, HXI, Ultimate, Ultracom, Ultracom2, Betacom, Easicom, Eden, Energy, Xtramax, SXI, Ultrapower and British Gas appliances. The heat exchanger transfers heat from a boiler's burner to water. A primary heat exchanger is found in all boilers, using heat from a burner to raise the temperature of the water in the system while a secondary heat exchanger is present only in combis and allows the heat to be transferred between closed systems.