{"schemaVersion":1,"slug":"iec-electric-heater-plan-mark","name":"Electric space heater plan mark","kind":"symbol","abbreviation":"HTR","aliases":["panel heater","convector heater outlet","wall heater symbol"],"category":"installation-communications","drawingTypes":["GA"],"referenceFamilies":["IEC"],"summary":"Plan mark for a fixed electric space heater, drawn as a rectangle with internal heating strokes.","description":["Fixed space heaters such as panel heaters, convector heaters and radiant wall heaters are drawn as a rectangle at the wall with parallel strokes or a zigzag representing the heating element. The rating in watts or kilowatts is usually written beside the symbol.","The mark tells the electrician to provide a dedicated circuit or fused connection and a control, which may be an integral thermostat or a room thermostat shown separately. Heater ratings feed the maximum demand calculation. The heating element symbol on schematics shows the resistor function; this plan mark locates a complete appliance."],"readingNotes":["Read the kW rating.","Check how the heater is controlled."],"drawingChecklist":["State rating.","Show control device.","Show isolation and protection."],"distinction":"A heating element in a schematic is a component; this plan mark represents an installed heater appliance.","facts":[{"label":"Graphic form","value":"Rectangle with heating strokes"},{"label":"Key data","value":"Rated power in W or kW"},{"label":"Exact standard graphic","value":"Not reproduced here; confirm the form against IEC 60617 and the project legend"}],"references":[{"sourceId":"iec-diagrams","relevance":"IEC graphical symbol context; independently drawn here."},{"sourceId":"pub-object-engineering-design","relevance":"Design methodology for heating loads and maximum demand."}],"related":["heating-element","iec-room-thermostat-plan-mark","iec-water-heater-plan-mark"],"artwork":"s28-iec-electric-heater-plan-mark","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"Space heater","reference":"IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier."},"plainEnglish":{"title":"What does Electric space heater plan mark mean?","introduction":"Fixed space heaters such as panel heaters, convector heaters and radiant wall heaters are drawn as a rectangle at the wall with parallel strokes or a zigzag representing the heating element. The rating in watts or kilowatts is usually written beside the symbol.","example":"The mark tells the electrician to provide a dedicated circuit or fused connection and a control, which may be an integral thermostat or a room thermostat shown separately. Heater ratings feed the maximum demand calculation. The heating element symbol on schematics shows the resistor function; this plan mark locates a complete appliance.","drawings":"Read the kW rating. Check how the heater is controlled. A heating element in a schematic is a component; this plan mark represents an installed heater appliance.","terms":[{"name":"Terminal","meaning":"An identified point where a conductor connects."},{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."},{"name":"Schematic","meaning":"A drawing showing function and connections rather than physical appearance."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"IEC graphical symbols for diagrams","url":"https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/"},{"label":"Electrical installation design methodology and references","url":"https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design"}],"detail":"Plan mark for a fixed electric space heater, drawn as a rectangle with internal heating strokes. A heating element in a schematic is a component; this plan mark represents an installed heater appliance.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-electric-heater-plan-mark","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-electric-heater-plan-mark.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"iec-diagrams","title":"IEC graphical symbols for diagrams","publisher":"IEC","url":"https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/","type":"standard","scope":"IEC 60617 and related symbol-design publications. Full database access requires a subscription.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"IEC graphical symbol context; independently drawn here."},{"id":"pub-object-engineering-design","title":"Electrical installation design methodology and references","publisher":"Schneider Electric — Electrical Installation Guide","url":"https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design","type":"manufacturer","scope":"Public design context. No universal working clearance, equipment dimension or project compliance conclusion is asserted.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Design methodology for heating loads and maximum demand."}]}