---
title: "Boiler Pressure Explained: How to Check and Set Pressure"
description: “Learn how to check and set your boiler pressure at home. Trusted Boilers explains what pressure is ideal, how to top up safely, and when to call an engineer.”
image: https://www.trustedboiler.co.uk/hubfs/20251231_133738.jpg
---
[info@trustedboiler.co.uk](mailto:info@trustedboiler.co.uk) [+44 7962389588](tel:447962389588)
Operating Hours: Monday - Friday 9am to 5pm
[128 City Road, London, EC1V 2NX](https://maps.app.goo.gl/dZWugXN2aW2tVucq5) [0208 088 9899](tel:0208%20088%209899)
[](https://www.trustedboiler.co.uk/)
[](https://www.trustedboiler.co.uk/)
- [Home](https://www.trustedboiler.co.uk)
- Services
- [Heat Only Boiler Installation](https://www.trustedboiler.co.uk/boiler-packs)
- [Combi Boiler Installation](https://www.trustedboiler.co.uk/combi-boiler-installation)
- [Boiler Repairs](https://www.trustedboiler.co.uk/boiler-repairs)
- [Boiler Servicing](https://www.trustedboiler.co.uk/boiler-servicing)
- [Boiler Maintenance](https://www.trustedboiler.co.uk/boiler-maintenance-services)
- [Gas Safety Certificate](https://www.trustedboiler.co.uk/gas-safety-certificates)
- About Us
- [About](https://www.trustedboiler.co.uk/about-us)
- [Testimonials](https://www.trustedboiler.co.uk/testimonials)
- [Blog](https://www.trustedboiler.co.uk/blog)
- Who we help
- [Home Owners](https://www.trustedboiler.co.uk/homeowners)
- [Landlords](https://www.trustedboiler.co.uk/landlords)
- [Pay Online](https://www.paypal.com/paypalme/TrustedBoilersLtd?country.x=GB&locale.x=en_GB)
More results
[Instant Quote](https://www.trustedboiler.co.uk/get-an-instant-quote)
[Instant Quote](https://www.trustedboiler.co.uk/get-an-instant-quote)
[Instant Quote](https://www.trustedboiler.co.uk/get-an-instant-quote)
- [Home](https://www.trustedboiler.co.uk)
- Services
- [Heat Only Boiler Installation](https://www.trustedboiler.co.uk/boiler-packs)
- [Combi Boiler Installation](https://www.trustedboiler.co.uk/combi-boiler-installation)
- [Boiler Repairs](https://www.trustedboiler.co.uk/boiler-repairs)
- [Boiler Servicing](https://www.trustedboiler.co.uk/boiler-servicing)
- [Boiler Maintenance](https://www.trustedboiler.co.uk/boiler-maintenance-services)
- [Gas Safety Certificate](https://www.trustedboiler.co.uk/gas-safety-certificates)
- About Us
- [About](https://www.trustedboiler.co.uk/about-us)
- [Testimonials](https://www.trustedboiler.co.uk/testimonials)
- [Blog](https://www.trustedboiler.co.uk/blog)
- Who we help
- [Home Owners](https://www.trustedboiler.co.uk/homeowners)
- [Landlords](https://www.trustedboiler.co.uk/landlords)
- [Pay Online](https://www.paypal.com/paypalme/TrustedBoilersLtd?country.x=GB&locale.x=en_GB)
[Instant Quote](https://www.trustedboiler.co.uk/get-an-instant-quote)
[0208 088 9899](tel:0208%20088%209899) [info@trustedboiler.co.uk](mailto:info@trustedboiler.co.uk)
[Boiler Service](https://www.trustedboiler.co.uk/blog/tag/boiler-service)[Boiler Maintenance](https://www.trustedboiler.co.uk/blog/tag/boiler-maintenance)
[Boiler Error Codes](https://www.trustedboiler.co.uk/blog/tag/boiler-error-codes)
# [Boiler Pressure Explained: How to Check and Set Your Boiler Pressure](https://www.trustedboiler.co.uk/blog/boiler-pressure-explained)
[](https://www.trustedboiler.co.uk/blog/author/eric-saayeng)
by [Eric Saayeng](https://www.trustedboiler.co.uk/blog/author/eric-saayeng)
2 min read
Dec 31, 2025, 1:45:44 PM
All Topics
[All Topics](https://www.trustedboiler.co.uk/blog)[Boiler Service](https://www.trustedboiler.co.uk/blog/tag/boiler-service)[Boiler Maintenance](https://www.trustedboiler.co.uk/blog/tag/boiler-maintenance)[Boiler Repair](https://www.trustedboiler.co.uk/blog/tag/boiler-repair)[Boiler Installation](https://www.trustedboiler.co.uk/blog/tag/boiler-installation)[Heating advice](https://www.trustedboiler.co.uk/blog/tag/heating-advice)[Homeowners](https://www.trustedboiler.co.uk/blog/tag/homeowners)[South London](https://www.trustedboiler.co.uk/blog/tag/south-london)[Boiler Error Codes](https://www.trustedboiler.co.uk/blog/tag/boiler-error-codes)[Boiler Safety](https://www.trustedboiler.co.uk/blog/tag/boiler-safety)[Energy Saving](https://www.trustedboiler.co.uk/blog/tag/energy-saving)[New Boiler Cost](https://www.trustedboiler.co.uk/blog/tag/new-boiler-cost)[Fault Code](https://www.trustedboiler.co.uk/blog/tag/fault-code)[Gas Safe](https://www.trustedboiler.co.uk/blog/tag/gas-safe)[combi boiler](https://www.trustedboiler.co.uk/blog/tag/combi-boiler)[Boiler Condemned](https://www.trustedboiler.co.uk/blog/tag/boiler-condemned)[Boiler at risk](https://www.trustedboiler.co.uk/blog/tag/boiler-at-risk)[Energy efficiency](https://www.trustedboiler.co.uk/blog/tag/energy-efficiency)[Room Thermostat](https://www.trustedboiler.co.uk/blog/tag/room-thermostat)[SMART thermostat](https://www.trustedboiler.co.uk/blog/tag/smart-thermostat)
A healthy boiler keeps your home warm and your hot water flowing. One of the most common reasons for boiler breakdowns is incorrect pressure - but understanding and adjusting it is easier than you might think. In this guide, Trusted Boilers Ltd. explains what boiler pressure is, why it matters, and how you can safely check and set it in your own home.
---
## What Is Boiler Pressure?
Boiler pressure is the force of water circulating through your central heating system, measured in 'bar' on your boiler’s pressure gauge. The right pressure ensures your radiators heat up properly and your boiler runs efficiently.
**Ideal boiler pressure (when cold):**
- Usually between **1.0 and 1.5 bar**
- Check your boiler manual or the sticker near the gauge for the exact range
---
## Why Is Correct Boiler Pressure Important?
- **Too low:** Heating may not work, boiler could overheat, lock out, or show a fault code
- **Too high:** System could leak, pressure relief valve may discharge water, or boiler may shut down
---
## How to Check Your Boiler Pressure
1. **Locate the pressure gauge** (usually on the front of your boiler)
2. **Read the needle:**
- In the green zone (1.0–1.5 bar, cold) – all good!
- Below 1.0 bar – pressure too low
- Above 2.0 bar (cold) – pressure too high
---
## How to Top Up (Increase) Boiler Pressure
If your pressure is too low:
1. **Turn off the boiler and let it cool**
2. **Find the filling loop** (a silver/grey flexible hose with taps/valves at both ends)
3. **Open both valves slowly** – you should hear water entering the system
4. **Watch the gauge** – when it reaches 1.2–1.5 bar, close both valves
5. **Turn the boiler back on and reset if needed**
**Tip:** Only top up a little at a time—overfilling can cause pressure to go too high.
[See our full boiler repair guide](https://www.trustedboiler.co.uk/boiler-repairs) if you’re unsure or your pressure keeps dropping.
---
## How to Release (Reduce) Boiler Pressure
If your pressure is too high:
- **Bleed a radiator:** Use a radiator key to release a little water (have a towel ready)
- **Check for leaks:** If you have to reduce pressure often, call an engineer
---
## When to Call a Professional
- If your pressure drops repeatedly
- Water leaks from the boiler or radiators
- You see fault codes or the boiler shuts down
- You’re not confident adjusting the pressure yourself
Book a repair or service here: [Boiler repairs – Trusted Boilers](https://www.trustedboiler.co.uk/boiler-repairs)
---
## Regular Servicing Prevents Pressure Problems
Annual servicing helps spot pressure issues before they become major faults. Learn more about [boiler servicing and maintenance](https://www.trustedboiler.co.uk/boiler-servicing).
---
## Serving South London & North Surrey
Trusted Boilers Ltd. provides expert advice, repairs, and servicing across Wimbledon, Sutton, Banstead, Epsom, Croydon, and surrounding areas.
[Contact us](https://www.trustedboiler.co.uk/get-an-instant-quote) for friendly, professional help.
- Recent
- Topics
- Archive
Recent
Topics
- [Boiler Service (18)](https://www.trustedboiler.co.uk/blog/tag/boiler-service)
- [Boiler Maintenance (15)](https://www.trustedboiler.co.uk/blog/tag/boiler-maintenance)
- [Boiler Repair (10)](https://www.trustedboiler.co.uk/blog/tag/boiler-repair)
- [Boiler Installation (9)](https://www.trustedboiler.co.uk/blog/tag/boiler-installation)
- [Heating advice (9)](https://www.trustedboiler.co.uk/blog/tag/heating-advice)
- [Homeowners (9)](https://www.trustedboiler.co.uk/blog/tag/homeowners)
- [South London (9)](https://www.trustedboiler.co.uk/blog/tag/south-london)
- [Boiler Error Codes (7)](https://www.trustedboiler.co.uk/blog/tag/boiler-error-codes)
- [Boiler Safety (5)](https://www.trustedboiler.co.uk/blog/tag/boiler-safety)
- [Energy Saving (5)](https://www.trustedboiler.co.uk/blog/tag/energy-saving)
- [New Boiler Cost (5)](https://www.trustedboiler.co.uk/blog/tag/new-boiler-cost)
- [Fault Code (4)](https://www.trustedboiler.co.uk/blog/tag/fault-code)
- [Gas Safe (4)](https://www.trustedboiler.co.uk/blog/tag/gas-safe)
- [combi boiler (3)](https://www.trustedboiler.co.uk/blog/tag/combi-boiler)
- [Boiler Condemned (2)](https://www.trustedboiler.co.uk/blog/tag/boiler-condemned)
- [Boiler at risk (2)](https://www.trustedboiler.co.uk/blog/tag/boiler-at-risk)
- [Energy efficiency (2)](https://www.trustedboiler.co.uk/blog/tag/energy-efficiency)
- [Room Thermostat (2)](https://www.trustedboiler.co.uk/blog/tag/room-thermostat)
- [SMART thermostat (1)](https://www.trustedboiler.co.uk/blog/tag/smart-thermostat)
See all
Archive
- [August 2026 (1)](https://www.trustedboiler.co.uk/blog/archive/2026/08)
- [June 2026 (2)](https://www.trustedboiler.co.uk/blog/archive/2026/06)
- [April 2026 (2)](https://www.trustedboiler.co.uk/blog/archive/2026/04)
- [March 2026 (1)](https://www.trustedboiler.co.uk/blog/archive/2026/03)
- [February 2026 (2)](https://www.trustedboiler.co.uk/blog/archive/2026/02)
- [January 2026 (3)](https://www.trustedboiler.co.uk/blog/archive/2026/01)
- [December 2025 (2)](https://www.trustedboiler.co.uk/blog/archive/2025/12)
- [November 2025 (2)](https://www.trustedboiler.co.uk/blog/archive/2025/11)
- [October 2025 (1)](https://www.trustedboiler.co.uk/blog/archive/2025/10)
- [September 2025 (3)](https://www.trustedboiler.co.uk/blog/archive/2025/09)
- [August 2025 (2)](https://www.trustedboiler.co.uk/blog/archive/2025/08)
- [July 2025 (1)](https://www.trustedboiler.co.uk/blog/archive/2025/07)
- [June 2025 (1)](https://www.trustedboiler.co.uk/blog/archive/2025/06)
- [May 2025 (1)](https://www.trustedboiler.co.uk/blog/archive/2025/05)
- [April 2025 (2)](https://www.trustedboiler.co.uk/blog/archive/2025/04)
- [March 2025 (1)](https://www.trustedboiler.co.uk/blog/archive/2025/03)
- [February 2025 (3)](https://www.trustedboiler.co.uk/blog/archive/2025/02)
- [January 2025 (2)](https://www.trustedboiler.co.uk/blog/archive/2025/01)
- [October 2024 (2)](https://www.trustedboiler.co.uk/blog/archive/2024/10)
- [September 2024 (2)](https://www.trustedboiler.co.uk/blog/archive/2024/09)
- [August 2024 (2)](https://www.trustedboiler.co.uk/blog/archive/2024/08)
See all
### Subscribe to our blog
Share this
[Share on Twitter](https://twitter.com/share?url=https://www.trustedboiler.co.uk/blog/boiler-pressure-explained&text=Boiler%20Pressure%20Explained:%20How%20to%20Check%20and%20Set%20Pressure) [Share on Facebook](https://www.facebook.com/sharer/sharer.php?u=https://www.trustedboiler.co.uk/blog/boiler-pressure-explained&t=Boiler%20Pressure%20Explained:%20How%20to%20Check%20and%20Set%20Pressure) [Share on LinkedIn](https://www.linkedin.com/shareArticle?mini=true&url=https://www.trustedboiler.co.uk/blog/boiler-pressure-explained&t=Boiler%20Pressure%20Explained:%20How%20to%20Check%20and%20Set%20Pressure)
Previous story
[← Boiler Repair: Is Steam from Your Flue Normal?](https://www.trustedboiler.co.uk/blog/boiler-repair-steam-flue)
Next story
[Room Thermostats: Best Use & Advice for a Warm, Efficient Home →](https://www.trustedboiler.co.uk/blog/room-thermostat-advice)
## You May Also Like
These Related Stories
[Why your boiler keeps losing pressure (and when to call a Gas Safe engineer in Croydon)](https://www.trustedboiler.co.uk/blog/why-your-boiler-keeps-losing-pressure-and-when-to-call-a-gas-safe-engineer-in-croydon)
[Boiler Service](https://www.trustedboiler.co.uk/blog/tag/boiler-service)
### Why your boiler keeps losing pressure (and when to call a Gas Safe engineer in Croydon)
Jun 24, 2026, 8:53:16 PM 3 min read
[Boiler Fault Codes Explained: What They Mean and When to Call an Engineer](https://www.trustedboiler.co.uk/blog/boiler-fault-codes)
[Boiler Service](https://www.trustedboiler.co.uk/blog/tag/boiler-service)
### Boiler Fault Codes Explained: What They Mean and When to Call an Engineer
Nov 18, 2025, 8:54:28 PM 4 min read
[Boiler Repair: Is Steam from Your Flue Normal?](https://www.trustedboiler.co.uk/blog/boiler-repair-steam-flue)
.png)
[Boiler Service](https://www.trustedboiler.co.uk/blog/tag/boiler-service)
### Boiler Repair: Is Steam from Your Flue Normal?
Dec 11, 2025, 10:00:20 AM 2 min read
### Get Email Notifications
[](https://www.trustedboiler.co.uk/)
Address: 42 Crispin Cres, Beddington, Croydon, CR0 4UE
Phone : [07930216914](tel:%20+44%207930216914)
Email : [info@trustedboiler.co.uk](mailto:info@trustedboiler.co.uk)
Services
- [Heat Only Boiler Installation](https://www.trustedboiler.co.uk/boiler-packs)
- [Combi Boiler Installation](https://www.trustedboiler.co.uk/combi-boiler-installation)
- [Boiler Repairs](https://www.trustedboiler.co.uk/boiler-repairs)
- [Boiler Servicing](https://www.trustedboiler.co.uk/boiler-servicing)
Resources
- [Home](https://www.trustedboiler.co.uk)
- [About Us](https://www.trustedboiler.co.uk/about-us)
- [Blog](https://www.trustedboiler.co.uk/blog)
- [Instant quote](https://www.trustedboiler.co.uk/get-an-instant-quote)
- [Book a boiler service](https://www.trustedboiler.co.uk/book-a-boiler-service)
- [Book free video call survey](https://www.trustedboiler.co.uk/book-a-free-video-call-survey)
Where we cover
- [Croydon](https://www.trustedboiler.co.uk/croydon)
- [South London](https://www.trustedboiler.co.uk/south-london)
- [Wimbledon](https://www.trustedboiler.co.uk/wimbledon)
- [Sutton](https://www.trustedboiler.co.uk/sutton)
- [Kingston](https://www.trustedboiler.co.uk/kingston)
- [Epsom](https://www.trustedboiler.co.uk/epsom)
- [Banstead](https://www.trustedboiler.co.uk/banstead)
- [Coulsdon](https://www.trustedboiler.co.uk/coulsdon)
Copyright © 2026 Trusted Boilers Ltd. Designed and Developed by[JDR Group.](http://www.jdrgroup.co.uk)
VAT: 394509661 | Company Number: 10558552
- [Terms](https://144823757.hs-sites-eu1.com/terms-conditions)
- [Privacy](https://144823757.hs-sites-eu1.com/privacy-policy)
- [Cookies](https://144823757.hs-sites-eu1.com/cookie-policy)
```json
{
"@context" : "https://schema.org",
"@type" : "BlogPosting",
"author" : {
"@type" : "Person",
"name" : "Eric Saayeng",
"url" : "https://www.trustedboiler.co.uk/blog/author/eric-saayeng"
},
"dateModified" : "2026-03-17T09:31:58.515Z",
"datePublished" : "2025-12-31T13:45:44.000Z",
"headline" : "Boiler Pressure Explained: How to Check and Set Pressure",
"image" : [ "https://www.trustedboiler.co.uk/hubfs/20251231_133738.jpg" ],
"mainEntityOfPage" : {
"@id" : "https://www.trustedboiler.co.uk/blog/boiler-pressure-explained",
"@type" : "WebPage"
},
"publisher" : {
"@type" : "Organization",
"logo" : {
"@type" : "ImageObject",
"url" : "https://www.trustedboiler.co.uk/hubfs/Trusted%20boilers%20logo.png"
}
}
}
```
```json
{
"@context" : "https://schema.org",
"@type" : "LocalBusiness",
"address" : {
"@type" : "PostalAddress",
"addressCountry" : "UK",
"addressLocality" : "Croydon",
"addressRegion" : "England",
"postalCode" : "CR0 4UE",
"streetAddress" : "42 Crispin Cres, Beddington"
},
"alternateName" : "Trusted Boilers",
"contactPoint" : {
"@type" : "ContactPoint",
"areaServed" : "GB",
"availableLanguage" : "en",
"contactType" : "customer service",
"telephone" : "0208 088 9889"
},
"geo" : {
"@type" : "GeoCoordinates",
"latitude" : 51.3773,
"longitude" : -0.1149
},
"image" : "https://www.trustedboiler.co.uk/hubfs/How-Long-Does-It-Take-To-Install-A-New-Gas-Boiler.png",
"logo" : "https://www.trustedboiler.co.uk/hs-fs/hubfs/trusted%20boilers%20logo.webp?width=1684&height=200&name=trusted%20boilers%20logo.webp",
"name" : "Trusted Boilers Ltd",
"openingHours" : [ "Mo 08:00-17:30", "Tu 08:00-17:30", "We 08:00-17:30", "Th 08:00-17:30", "Fr 08:00-17:30", "Sa 09:00-13:00", "Su Closed" ],
"priceRange" : "£",
"sameAs" : [ "https://www.facebook.com/TrustedBoilersltd", "https://www.instagram.com/trusted_boilers22/" ],
"telephone" : "020 4572 0304",
"url" : "https://www.trustedboiler.co.uk/"
}
```