• 13 parts
  • Checked October 2026

Parts of a Gas Heater

A gas room heater from the front, then the parts behind its lower panel.

Parts of a Gas Heater

Name Date

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1 2 3 4 5 6 7 8 9 10 11 12 13
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Write the name of each numbered part.Answer key

  1. Cabinet
  2. Burner plaque
  3. Grill guard
  4. Control knob
  5. Ignitor button
  6. Lower front panel
  7. Mounting bracket
  8. Pressure regulator
  9. Control valve
  10. Pilot burner
  11. Thermocouple
  12. Ignitor electrode
  13. Thermostat sensing bulb

Own drawing from plain geometry. Licence: own work.

Each numbered ring is a button. Use the arrow keys to move between them and Enter to choose. Names are read out in Study, and once a part is answered.

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All 13 parts on the diagram

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The heater 7

  1. Cabinet The metal case of the heater. Everything else is mounted in it.
  2. Burner plaque The gas burns on its face, and the plaque glows.
  3. Grill guard A guard of wires in front of the hot burner.
  4. Control knob Turns the heater to off, pilot or a heat setting.
  5. Ignitor button Pressing it makes the spark that lights the pilot.
  6. Lower front panel A cover over the controls. It comes off for service.
  7. Mounting bracket A bar screwed to the wall. The heater hangs on it.

Behind the panel 6

  1. Pressure regulator The gas line connects here, before the control valve.
  2. Control valve The knob turns this valve. It feeds the burner and the pilot.
  3. Pilot burner It holds the small flame that lights the main burner.
  4. Thermocouple Its tip sits in the pilot flame. If it cools, the gas shuts off.
  5. Ignitor electrode The spark jumps from its tip to light the pilot.
  6. Thermostat sensing bulb It measures the temperature of the air near the cabinet.

How this list was compiled: Every name checked on 2026-10-01 and kept only where two unrelated makers' owner's manuals use it of a vent-free gas room heater, read as page text on archive.org. (1) Two makers' manuals that share their wording, counted as one source: https://archive.org/details/manualzilla-id-7055145 and https://archive.org/details/manualzilla-id-7439913 : product identification figure (piezo ignitor button, control knob, grill guard, burners, front panel, heater cabinet; blue flame heater and infrared heater), ODS/pilot with thermocouple and ignitor electrode, burner plaques on infrared models, control valve with a thermostat sensing bulb, pressure regulator, mounting bracket. (2) A second maker's manual, https://archive.org/details/manualzilla-id-7342353 : plaque heaters and blue flame heaters, ignitor button, control knob, burners, front panel, grille guard, mounting bracket, pilot burner, thermocouple, ignitor electrode, oxygen depletion sensor, control valve with a thermostat sensing bulb, pressure regulator. (3) A third maker's manual, https://archive.org/details/manualzilla-id-7252668 : ignitor button, control knob, grill, burners, lower front panel, heater cabinet, pilot burner, thermocouple, ignitor electrode, ODS pilot assembly, thermostat sensing bulb, pressure regulator, mounting bracket. (4) Wikipedia, Thermocouple (gas appliance safety), Pilot light and Piezo ignition, text only, https://en.wikipedia.org/wiki/Thermocouple#Gas_appliance_safety , https://en.wikipedia.org/wiki/Pilot_light and https://en.wikipedia.org/wiki/Piezo_ignition : the tip of the thermocouple sits in the pilot flame and holds the gas valve open; a piezo igniter makes a spark when its button is pressed. Licence: own work

The drawing: Own drawing from plain geometry; nothing traced. Licence: own work

How it works

This is a vent-free gas room heater, the kind that hangs on a wall or stands on feet. The first view names what you see from the front. The second opens the lower front panel.

Read the full guide

From the front

The cabinet holds the burner behind a grill guard. On this infrared kind the burner is a row of plaques that glow. The control knob and the ignitor button stand on top, and the mounting bracket holds the heater on the wall.

Behind the panel

Gas comes in through the pressure regulator to the control valve. One tube goes up to the burner and one to the pilot burner. Beside the pilot stand the ignitor electrode, which sparks, and the thermocouple. On thermostat models a sensing bulb on a thin tube tells the valve the air temperature.

  • The quiz takes igniter or piezo ignitor for ignitor button, and ODS pilot for pilot burner.
  • A blue flame heater has the same controls, with a glass panel in place of the plaques.

Questions and answers

What are the parts of a wall heater?

A gas wall heater has a cabinet, a burner behind a grill guard or a glass panel, a control knob, an ignitor button, a pilot with its thermocouple and ignitor electrode, a control valve, a pressure regulator and a mounting bracket.

What does the thermocouple do on a gas heater?

Its tip sits in the pilot flame. While the flame heats it, the gas valve stays open. If the pilot goes out, the thermocouple cools and the heater shuts down.

What is an ODS pilot?

ODS stands for oxygen depletion sensor. On a vent-free heater it is the pilot itself: it shuts the heater off if the room does not have enough fresh air.

How does the ignitor button light the pilot?

It is a piezo ignitor. Pressing the button makes a spark at the ignitor electrode, next to the pilot burner, so no match or battery is needed.

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