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- 14:08, 10 June 2026 Morgan Allen talk contribs created page S-Plan Wiring Reference Pack (Created page with "= S-Plan Heating System Wiring Reference = == Overview == S-Plan systems use separate 2-port valves for heating and hot water control. == Main Components == * Boiler * Programmer / timer * Room thermostat * Cylinder thermostat * 2 × 2-port motorised zone valves (heating + hot water) * Pump * Junction box / wiring centre --- == System Operation == * Heating and hot water are independently controlled. * Each zone has its own valve. * Each valve provides a separate boi...")