What does water pressure mean in a combi-boiler?

I have a Vaillant ecoTEC combi boiler that was installed last summer from new with no issues .... until now.

I have just bled the rads around the house (due to very low heat from the rad in the loft ..... which did turn out to have a lot of air in it) .... and we now have no hot water (but we do have central heating still!)

I have rebooted the ecoTEC Boiler a couple of times and get an F22 error message .... which is one of the error messages according to the Operating Manual which occur when the water pressure in the heating system is too low (it is 0.4 Bar, which is too low)

The manual also says that if the Pressure Gauge is below 0.8 bar then fill the system up with water before putting the boiler in operation.

However, what the manual doesnt show is the procedure to top up the pressure / fill the system up with water??

On my old boiler there was a big old stop cock that I could manually adjust and watch the pressure gauge increase to the right value...

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Hi All,

Am thinking of upgrading the aged hot water system in my new flat, from a simple boiler and three tanks (hot, cold, header) affair, to a combi-boiler so I can free up the space the tanks are taking up.

My main concern is with water pressure. The mains pressure into the flat (2nd floor - top) appears to be pretty good (in my humble opinion). However the hot water pressure is shocking, resulting in dribbling showers ; I presume this is because the hot water tank sits floor level. There is a pump, but it looks pretty shot.

Am I right in thinking that by putting in a combi-boiler hot water should be supplied to outlets at the same pressure as the incoming mains? Hence I can expect better hot water pressure with this new water system arrangement? = good shower!

Also is there any (simple) way of measuring what the water pressure is? Some of the shower heads I have been looking at say they require 5.0bar minimum, which I think is higher than mains...

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Hello there

We're looking at installing a Firebird oil-fired combi boiler... We've heard they're better than Worcester Bosch - any views? (Our plumber said that Worcester had overcome problems that there were a few years ago with their boilers - is that right?)

The other thing about it is that we don't have mains water pressure, so on the face of it we shouldn't be able to have a combi boiler - but we're hoping to fit a pump on the cold water supply to achieve mains pressure, so we can have the combi. Any views on this? I know that there's the obvious downside that the pump is one more thing to fail... We're also having an electric hot water cylinder as a back-up in case the combi breaks.

Any thoughts on this would be appreciated...

All the...

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Combien (in French) means How many or How much.
"Combi" is the first part of the "Goth/Techno/Industrial" 'band' CombiChrist. There is no specific word 'combi' - per se - but this is an 'alternative rock' band and they are very much in to the counter culture shock music and are very much a popular group with individuals that like to be seen as 'on the edge' and 'in your face' and anti-establishment. CombiChrist is classified 'aggrotech' and is from Norway but based currently in the USA. There are 4 members of the band. They have an 'Official Site' and a MySpace. They do not tell or say what the 'combi' means to them. Aggrotech, like most made up terms in 'rock art' is a harsh and loud and abrasive sound. It is said, by some in 'the know', that Aggro is short for Aggravation. 'Combi' is also simply short or abbreviation for: Combination and for Combine - a machine for harvesting or adding 2 or more things together. The 'Combi' in CombiChrist is probably for the machine...

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Please can someone help me, I am very confused indeed. :-/

I had a small combi boiler fitted a few years ago, but since then my hot water pressure is usless and my cold is really fierce. It wasn't like this before.

It was too hard to regulate a mixer tap shower so I bought a triton cromo single lever mixer shower which we had plumbed to the mains pipes, not the boiler.

But again we are having issues with the fact that too much cold and not enough hot. When turned down to the right temprature it dribbles out of the shower with not enough power to shower a gnat.

And now I have been told that as I have a combi boiler I can't have a pump as it has its own. Is this true? even if the shower is not fitted to the boiler itself?

If this is true how on earth can I sort out this water pressure issue.

Please, please someone help me.
Thankyou all so much for your answers.

I know...

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Martin Smith the Emergency Plumber answers your frequently asked questions on "Why does my combination boiler lose pressure?" The fact is that your boiler is losing pressure because there is a leak in your system. The questions below are the top 10 questions to ask about the boiler pressure which we try our best to give the best answers below.

1. My combi boiler is losing pressure? - This is the most asked question when searching the internet and we are here to answer your questions as follows:

2. Combi boiler pressure - This is the second most typed in question when looking for an answer.

3. What should the pressure be on my boiler?

4. Why does my boiler keep losing pressure?

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6. Boiler losing pressure no leak?

7. What pressure should my boiler be?

8. How to release pressure from my combi boiler?

9. My boiler is losing pressure?

10. Where do i pressurise the...

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What is a combi boiler?

A combi (or combination) boiler is an ingenious space-saving idea, and an increasingly popular choice in UK homes. In fact, combis now account for well over half of all the new domestic boilers installed in Britain every year.

A combi boiler is both a high-efficiency water heater and a central heating boiler, combined (hence the name) within one compact unit. Therefore, no separate hot water cylinder is required, offering space saving within the property.

Further benefits of a combi boiler includes hot water being delivered through your taps or shower at mains pressure. So you can enjoy powerful showering* without the need for a pump.

Another combi boiler benefit is that it can generally save you money on installation time and costs, since no tank in the roof space means less pipe work and a shorter installation time.

View our range of combi...
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A loss of water pressure is a good indicator of some common issues that arise with boilers. Low pressure is relatively easy to diagnose, as most boilers have a built-in pressure gauge. Sometimes, it’s possible to correct water pressure yourself

Understanding water pressure

Constant water pressure is essential to the efficient functioning of your boiler system. Pressure in most modern combination boilers is maintained by cold water flowing from the water mains supply through a mechanism known as the ‘filling loop’[1].

What causes a drop in pressure?

A number of things can cause pressure to drop. It may be that there is a leak somewhere in your boiler system. Or, if you bled your radiators recently, it may be that pressure was lost then.

However, you may not be able to tell that you have a problem until you check the pressure gauge. A water leak, for instance, may be tiny and go unnoticed at first, only to develop into a larger problem down the...

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The inside of a


operated two-stage tankless heater, heated by single-phase electric power. The copper tank contains heating elements with 18


maximum power.

Tankless water heaters—also called instantaneous, continuous flow, inline, flash, on-demand, or instant-on water heaters—are gaining in popularity.[citation needed] These high-power water heaters instantly heat water as it flows through the device, and do not retain any water internally except for what is in the heat exchanger coil. Copper heat exchangers are preferred in these units because of their high thermal conductivity and ease of fabrication.

Tankless heaters may be installed throughout a household at more than one point-of-use (POU), far from a central water heater, or larger centralized models may still be used to provide all the hot water requirements for an entire house. The main advantages of tankless water heaters are a plentiful continuous flow of hot water (as...

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Every boiler and central heating system needs a bit of attention occasionally, in addition to its normal annual service.

This includes repressurising the system and bleeding the radiators. Your boiler's user guide has details on how to carry out these simple procedures, and you can find an overview and links to our How-to videos on this page.

If you still can't get your boiler to light, or you need help with the system and controls, please contact your installer or Baxi Customer Support for help.

Frequently asked questions

How do I find out what the pressure of my central heating is?

Combi and system boilers will have a pressure gauge in the control panel that looks like this:

Heat only (or regular) boilers installed on a pressurised system will have a pressure gauge installed in the pipework.

Open vented central heating systems (you will have feed and expansion tanks in the loft) are not pressurised and will not...

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Not all taps on the market are the same and, more often than not, require a bit of background research before you purchase. A lot of simply designed taps, such as washer taps or mono bloc mixers are likely to be compatible with low pressure water systems. On the other hand, more specialised taps and mixers such a 4 hole bath mixers will require a much higher water pressure to function properly.

Different products by different manufacturers all carry various pressure labels ranging from 0.1 Bar for low pressure systems to 3 Bar for products that require very high water pressure. At Island Bathrooms, we define high pressure as anything over 0.2 Bar for bathroom taps and anything over 0.5 Bar for kitchen taps.

The reasoning behind this is due to the distance that the taps will sit from the water system. In most UK households, a gravity system will be in place which consists of a cold water storage tank in the in the loft. Every 1 metre drop from the water tank typically...

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Since boiler and radiator heating systems are typically found in older homes, boiler installation is often a replacement task rather than a task performed during new home construction. Despite the popularity of other heating units in new structures, one thing that no one can deny about boiler and radiator heating systems is that they are extremely durable. Though boiler installation is less common than furnace installation, those who have the former are rarely in any hurry to switch to the latter. Boiler and radiator heating systems are much more expensive to set up than furnace and forced-air systems, but the comfortable, moist heat boiler and radiator systems produce is something many find preferable to the dry heat created by forced-air systems. Boiler replacement is a perfect opportunity for streamlining your home's energy efficiency. If you've put more than 15 years on your current boiler, replacement is likely to greatly increase your energy...

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