Every heating, hot water and air conditioning electrical termination symbol — drawn to BS EN 60617 with BS 7671 supply requirements for each appliance.
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Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.
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Below are every mechanical + hvac symbols on the Elec-Mate symbol library, drawn to BS EN 60617. Right-click any symbol to save the SVG, or use the AI Diagram Builder to drag them directly into a circuit drawing.
A heating boiler — gas, oil, or electric. Even gas/oil boilers need a 230 V supply for pumps, controls, and ignition. Supplied via switched fused spur.
Used in: Kitchens, utility rooms, garages, lofts; needs local 3A fused isolation per BS 7671.
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An electric water heater — usually a 3 kW immersion in a hot water cylinder, or instantaneous undersink/handwash unit. Supplied from a dedicated radial.
Used in: Hot water cylinders (in airing cupboard), under sinks, point-of-use in remote washrooms.
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A wall-mounted electric panel heater — convection, fan-assisted, or radiant. Sizes typically 0.5-2.5 kW. Often timer/thermostat controlled.
Used in: Offices, holiday lets, supplementary heating, garages — wherever wet heating is impractical.
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An air conditioning unit — split system or VRV/VRF. Indoor unit + outdoor condenser. Electrical supply usually fed to the outdoor unit which powers the indoor head.
Used in: Server rooms, offices, retail; needs F-gas certified installer; isolator local to outdoor unit.
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A fan coil unit — local fan + heating/cooling coil supplied from a central plant. Provides zone-level temperature control in commercial HVAC.
Used in: Offices, hotels, hospitals; typically ceiling-mounted with low-voltage controls + 230 V fan supply.
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A heated towel rail with an integral element. Typically 100-600 W. Supplied via switched fused spur outside the bathroom; must be RCD-protected.
Used in: Bathrooms, en-suites, utility rooms; FCU outside the bathroom or zone 3 with IPX4.
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A general-purpose electric heater symbol — covers radiant, convection, fan and oil-filled portable heaters. Supplied via switched fused spur or socket.
Used in: Domestic supplementary heating, offices, workshops, garages.
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A commercial hand dryer — typically 1.5-2.5 kW. Supplied via switched fused spur with local isolation. RCD protected per BS 7671 411.3.3.
Used in: Commercial WCs, restaurants, schools, hospitality; needs 2.5 kW supply on its own spur.
See all mechanical + hvac symbols →Every heating, hot water and air conditioning electrical termination symbol — drawn to BS EN 60617 with BS 7671 supply requirements for each appliance.
Each symbol is drawn to BS EN 60617 — the UK adoption of the international IEC 60617 standard for graphical symbols on electrical diagrams. The same symbols appear on EICR forms, distribution board schedules, single-line schematics and installation layout drawings.
Looking for symbols in a different category? See the full BS EN 60617 symbol library covering switches, sockets, lighting, distribution, safety, containment, equipment, mechanical, renewables, controls and architectural symbols.
The Elec-Mate AI Diagram Builder gives you every BS EN 60617 symbol on a draggable canvas — perfect for circuit diagrams, certificate schedules…
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