Glow-worm DHW Heat Exchanger Ultracom 2 0020097179

The Glow-worm 0020097179 is a domestic hot water (DHW) plate heat exchanger for the Ultracom 2 range of condensing boilers. It sits on the domestic hot water circuit, where heat from the primary water is transferred across its plates to the incoming mains cold water supply. A scaled, blocked or leaking exchanger is a common cause of poor or intermittent hot water on these appliances.

• Domestic hot water runs cold or only lukewarm while the heating circuit works normally
• Hot water temperature fluctuates or drops away as the tap is run
• Reduced hot water flow rate at the outlets, pointing to a restricted or scaled exchanger
• Water weeping from the plate pack or from the connections around the exchanger
• Repeated lockouts or overheat faults on the domestic hot water demand

• Check the GC number on the appliance data badge against 47-019-11, and confirm the model is an Ultracom 2 30CXi before ordering
• Confirm the part number 0020097179 matches the exchanger currently fitted, as alternative numbers 1340396 and N8855 may appear on older stock or documentation
• Inspect the seals and connections on removal and replace any that are perished or deformed, as the exchanger is refitted onto the primary and DHW pipework
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.