Sime Main Heat Exchanger Body 6278920

The main heat exchanger body is the primary component that transfers heat from the combustion gases to the heating and domestic hot water circuits in a Sime boiler. This part is manufactured by Sime under part number 6278920 and is intended for the Murelle ONE HE 25 appliance. It forms the core of the boiler's heat transfer assembly and must be matched correctly to the appliance model before fitting.

• Visible leaks or weeping from the heat exchanger body or its connections
• Repeated loss of system pressure with no external leak found elsewhere
• Overheating or lockout faults traced to restricted or scaled waterways in the exchanger
• Discolouration, corrosion or pitting on the exchanger body
• Combustion readings outside the manufacturer's stated range that point to a failed exchanger

• Confirm the appliance model and reference number against the fitment list above
• Check the existing part number on the component being replaced
• Inspect associated seals, gaskets and connections for condition before fitting
• Verify that any fault code or symptom is traced to the heat exchanger before ordering