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- 14:10, 10 June 2026 Morgan Allen talk contribs created page Combi Boiler Control Wiring Reference Pack (Created page with "= Combi Boiler Electrical Control Wiring Reference = == Overview == Combi systems do not require external hot water control. Heating demand is sent directly to the boiler. == Main Components == * Combi boiler * Room thermostat or smart thermostat * Optional external programmer * Fused spur supply * Boiler control terminals (heating demand input) --- == System Operation == * Boiler fires when it receives a heating demand signal. * No cylinder or zone valves required....")