Cooling And Heating
Written by Dale Richardson - Updated: June 23, 2023
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While modern gas boilers are truly useful machines, like all things in life, they're prone to failure. That means that you'll need to regularly maintain them and give them a bit of love here and there - and that's normal. If you notice that you've got low gas pressure to your boiler, there are a few things to keep an eye out for.
The most common causes for low gas pressure to a boiler are a leak or a reduced system pressure due to bleeding a radiator.
Now without further ado, here's how to fix the issue that brought you here in the first place!
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At least in the UK, most homes use a gas combi heater to heat water. These will generally have a pressure gauge located on the side near the control panel. It'll look similar to the photo below, and you're looking to have it in the green zone. This should be between 1-1.5 bar (14-21 PSI for Americans) for ideal gas pressure. If it's in the red zone, you're getting too much pressure, though it's unlikely that's the case if you're here due to low pressure.
If the needle has fallen below the green line (1 bar) you've got a problem, and assuming your radiators aren't heating up as usual, this is a strong sign that there's a problem with your boiler pressure.
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Long story short - no. While low gas pressure to the boiler is inconvenient and will impact your heating bill, it isn't outright dangerous. On the other hand, a pressure that's too high is a problem that should be addressed immediately by a licensed professional.
One way or another, there's no sense in ignoring the issue, as low pressure will make your home less effective in staying warm and will cost you an arm and a leg. And nobody wants that, do they?
Like we said in the introduction, the two major causes of low gas pressure to the boiler are a water leak or a bled radiator. While the former can be a major issue, the latter is actually rather easy to fix yourself.
Here's a bit more information.
Here's a beginners guide of what to do:
If you've been reading our articles for a while, you'll know that we taught how to fix cold radiators by bleeding them. While this is a common (and good) practise, it can cause a drop in boiler pressure. For the uninformed, bleeding a radiator removes air that's trapped in the pipes, allowing hot water to take its proper place in the radiator.
Here's where the fun begins. To fix low gas pressure to your boiler, you need to repressurise it. While this can generally be done at home without a Gas Safe engineer, it's best to double-check. Not all boilers can be serviced like this - so do your homework before attempting. Now, here's the fix.
Boilers are complicated and important parts of our home. If you find that you've suddenly got low gas pressure to your boiler, there are a few things to keep an eye out for. If you've recently bled a radiator, you'll likely need to repressurize your boiler as detailed above. This is the ideal problem, as it can be dealt with rather easily at home without the help of a professional.
If, however, you haven't recently bled a radiator in your home, it's possible that you have a leak somewhere along the line. This is a much more serious issue that can't be addressed without a plumber, and you really don't want to ignore this. If you spot signs of water damage in your home, such as corroded pipes, water spots, or puddles (obviously), you need to get it addressed ASAP. Don't, however, mistake condensation for a leak. While condensation is something to address, it's not as vital as a leak.
And as always, please don't hesitate to call a professional. If you've gone through the effort to troubleshoot, you've already done more than many homeowners do and your plumber will thank you. You just made their life easier, and they're about to make yours easier.
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