What is a thermistor?

If you’ve spotted the word thermistor in heating specs and thought “what is that”!

You’re not alone.

What is a thermistor?

A thermistor is a temperature sensor. It helps a heating system measure temperature accurately by changing its electrical resistance as temperature changes.

In normal-people terms: it’s one of the components that helps the system sense temperature so it can control heat sensibly.

Why would a thermistor matter in a heating system?

Because heating control is basically a loop:

1. Measure temperature

2. Decide whether heat is needed

3. Turn the element on/off to maintain comfort

A thermistor is part of step 1.

You might see thermistors mentioned as “floor sensors”

Some setups use a sensor to help measure temperature in a specific spot (for example, near the floor). That can be useful for control and comfort, especially in rooms where temperature can vary from floor to ceiling.

The homeowner takeaway

If you’re not an engineer, here’s what to remember:

• A thermistor is a sensor

• Sensors help the system measure temperature

• Better measurement supports steadier control (less guesswork)

If you want, tell us what room you’re heating and how you use it (all day vs mornings/evenings) and we’ll help you think through the best setup.

For more information please call 0800 5999 109 or email [email protected] for a free quote or consultation today.

Tags: General Guides, Understanding Heating.