# Electric space heater plan mark

Canonical URL: https://eloragrid.ai/symbols/iec-electric-heater-plan-mark
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: HTR
Drawing use: GA
Reference families: IEC

## Symbol convention

Convention: IEC
Form: Space heater
IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

Plan mark for a fixed electric space heater, drawn as a rectangle with internal heating strokes.

## In plain English

### What does Electric space heater plan mark mean?

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.

### A simple 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.

### What the drawings help you do

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.

### This particular reference

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.

### Terms

- Terminal: An identified point where a conductor connects.
- Rating: A value stating the conditions for which equipment is specified.
- Schematic: A drawing showing function and connections rather than physical appearance.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/)
- [Electrical installation design methodology and references](https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design)


## What it represents

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.

## How to read it

- Read the kW rating.
- Check how the heater is controlled.

## Information to show or reference

- State rating.
- Show control device.
- Show isolation and protection.

## Important distinction

A heating element in a schematic is a component; this plan mark represents an installed heater appliance.

## Facts

- Graphic form: Rectangle with heating strokes
- Key data: Rated power in W or kW
- Exact standard graphic: Not reproduced here; confirm the form against IEC 60617 and the project legend

## Public references

- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/) — IEC. IEC graphical symbol context; independently drawn here.
- [Electrical installation design methodology and references](https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design) — Schneider Electric — Electrical Installation Guide. Design methodology for heating loads and maximum demand.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.