Heating boiler gauge replacement questions & answers.

Do leaks into a boiler temperature/pressure gauge matter?

What are the different needles on a boiler gauge and how do you read or use them?

Is a leaky boiler gauge unsafe? (Yes.)

Q&A on How to Replace a Heating Boiler Pressure Temperature Gauge

These FAQs on how to replace the pressure/temperature gauge on a heating boiler gauge were posted originally

at BOILER GAUGE REPLACEMENT - be sure to see the step-by-step guide given there.

Why does my boiler gauge have two needles + a manually adjustable one?

Why does my boiler temperature gauge have two needles. A black one and a manual adjustment red one? On 2019-01-21 by Bill

by (mod) - The gauge reads temperature, pressure, and the red needle can move to mark a target or safety limit

Thanks for a great question.

The black needle tells us what pressure the gauge is sensing or reporting as boiler pressure.

The red, adjustable, needle permits a technician to set what's simply a "marker" or "indicator" that might be used

to set a recommended pressure level (or maximum) that has allowed for variations in elevation of the heating system above sea level (as the gauge was factory set assuming working at sea level or 1 ATM)

to warn a client that the system pressure is exceeding what's recommended.

For example:

in the UK British Gas gives this advice

Usually, on the front of your boiler, you’ll find a water pressure gauge. If you have a hydraulic pressure gauge, you’ll see low and high pressure indicated by red sections on the dial.

The position set when the boiler was installed is sometimes shown by a red indicator needle. On most digital gauges, you’ll see a flashing pressure reading, if there’s a low (or high) pressure warning.

If your boiler pressure reads less than 1 bar, it’s possible that you might have lost water from the system, which needs to be replaced. This is where that filling loop (or filling link) comes in again!

If the pressure gauge on your boiler indicates high pressure (above 2.75 bar), then you may need to bleed a radiator to bring the level down to around 1.5 bar.

This can be tricky and, occasionally, dangerous; due to high water temperatures. We recommend an engineer take a look if you are experiencing high pressure – this could be a result of a fault inside the boiler and may need an engineer visit to rectify.

Additionally, reducing pressure by bleeding a radiator may take some time, and you will need some method of catching the water to prevent damage to wall and or floor coverings.

Above all, be careful. This water is very hot, so maybe get an engineer to do it.

Original source: https://www.britishgas.co.uk/home-services/boilers-and-heating/guides/boiler-pressure.html

My boiler gauge has water in it - should I replace it?

The gauge developed condensation inside when it was zero degree outside and the boiler was on what seemed like every hour.

The condensation dissipated when the weather got a little warmer and the boiler was on regular intervals. What should I do about that. It never happened before.

Should I get it replaced or ? On 2016-01-10 by Sandie

by (mod) - Watch out: replace a boiler gauge that has water inside: it can be unsafe and can lead to loss of heat

If there is water at the proper level, ask your service tech to check for surging.

If there is no water in the sight glass, just droplets, the system is unsafe, should be shut off, and it's water feeder repaired.

A boiler pressure/temperature gauge that has water inside it needs to be replaced, not just for accuracy but because it can burst, hit someone with hot water, and lose water from the boiler, leading to loss of heat or even an unsafe boiler condition.

Why is my new boiler gauge stuck at 70 psi?

What would cause a Pressure/Temp gauge to get stuck at 70psi after it being replaced? This gauge was replaced on my Weil-McLain II Boiler.
Thank you. On 2015-02-17 by Ruth

by (mod) -

Perhaps the gauge or its sensor was damaged at installation.

The pressure/temperature gauge needs to be replaced

by Ruth - how long does it take to replace a bad heating boiler gauge?

One more question -How long should it take to replace a Pressure/Temp gauge on the boiler and do you have to drain the system to replace the gauge properly? Thank you again.

To (mod) I am having alot of trouble with NJR Home Services who replaced the Pressure/Temp gauge on the boiler.

Do you have any suggestions how to get them to rectify the problem? Who should I contact beside them. I did have a plumber come out to tell me the Pressure/Temp gauge was broken and he replaced it.

I have a contract with NJR Home services and I want to cancel it, but they said I will have pay for their services. What action can I take against them to get this problem resolved. Can you help as to whom I should contact for their faulty services? Thank you.

by (mod) - it depends

I'd give the service manager a call to ask for help with the gauge, explaining that it was replaced but is not working.

Unless the boiler or gauge mount is badly rusted, the time to replace it depends: the boiler has to be cooled down and possibly drained (depending on the gauge location) before the gauge can be replaced. So that simple repair could be an hour.

...

Continue reading at BOILER GAUGE REPLACEMENT - topic home, or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.

Or see GAUGES, HYDRONIC BOILER FAQs

Or see these

Heating Boiler Pressure Gauge Articles

• BOILER CONTROLS & SWITCHES
• BOILER GAUGE REPLACEMENT
• BOILER PRESSURE & TEMPERATURE SETTINGS
• BOILER PRESSURE CONTROLS & SETTINGS
• GAUGES, HYDRONIC BOILER
• GAUGES, STEAM BOILER
• PRESSURE REDUCER / WATER FEED VALVE, BOILER
• RELIEF VALVES - TP VALVES

Suggested citation for this web page

BOILER GAUGE REPLACEMENT FAQs at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

INDEX to RELATED ARTICLES: ARTICLE INDEX to HEATING SYSTEMS

Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia

Ask a Question or Search InspectApedia

Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.

Note: appearance of your Comment below may be delayed: if your comment contains an image, photograph, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. Apologies for the delay.

Only one image can be added per comment but you can post as many comments, and therefore images, as you like.
You will not receive a notification when a response to your question has been posted.
Please bookmark this page to make it easy for you to check back for our response.

---

IF above you see "Comment Form is loading comments..." then COMMENT BOX - countable.ca / bawkbox.com IS NOT WORKING.

In any case you are welcome to send an email directly to us at InspectApedia.com at editor@inspectApedia.com

We'll reply to you directly. Please help us help you by noting, in your email, the URL of the InspectApedia page where you wanted to comment.

Citations & References

In addition to any citations in the article above, a full list is available on request.

---

ADVERTISEMENT

---