BoilerHow-To2026-02-28
How to Check Your Boiler Pressure
The pressure gauge should read 1–1.5 bar when cold — here's how to read it.
Knowing how to check boiler pressure helps you spot problems early.
Read the gauge
Find the pressure gauge on the boiler; when cold it should sit between 1 and 1.5 bar, often shown in a green zone.
What the reading means
Below 1 bar usually causes lockouts (top up); above 2.5 bar is too high and may trip the relief valve.
Key takeaways
- 1–1.5 bar cold is normal
- Below 1 bar = top up
- Above 2.5 bar = too high
- Check when the system is cool
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