How much work is involved to change a conventional boiler to a combi boiler?


If you have just bought a new home, your existing boiler has broken down or the boiler that you have is over 12 years old, then you should maybe consider a replacement. Combi boilers are fantastic, as they provide space heating as well as water on demand – you can do away with the hot water tank.

If you have a regular heat-only boiler is it worth making the change?

Your existing heating system

First of all, it is important to establish the existing heating system you have and the type of arrangement you are looking for. This will impact on whether or not a combi boiler is appropriate to install in your home.

When talking about ‘conventional systems’, we are normally referring to a heat-only boiler, which has two cold-water tanks in the loft space and a hot water tank, normally found in the airing cupboard.

A system boiler is very much like a heat-only boiler, except you don’t require the feed and expansion cold-water tanks in the...

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What is an electric boiler

An electric boiler uses electricity rather than gas to heat hot water. Just like a gas boiler, it will heat up the water that warms your radiators, and the water you use in the kitchen and bathroom.

They can come in various shapes and sizes, but in all electric boilers, you’ll see water running through the system to be heated by a heating element – similar to the way a kettle works.

Advantages and disadvantages of electric boilers

Electric boilers can be convenient to install and can be energy efficient, but there are some drawbacks when compared to a gas boiler.

Electric boiler system

Gas boiler systems

How to purchase an electric boiler

It’s best to buy an electric boiler through a trustworthy vendor or company. We don’t install electric boilers but we may have an alternative to suit the needs of your home and your lifestyle.

If you’d like a little more information about what type of...

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it does NOT "take under an hour" any one who tells you other wise is stupid.

The problems are as follows

You buy a boiler from a website, you then have to find some one who will fit it. and make it work.
You would be better off asking first will they fit it.

The boiler you buy may be a "piece of junk" to some but the "bees knees" to others

Most heating engineers (you don't want a plumber) will not G'tee it if you supplied it

Most heating engineers will insist you have a "pressure wash" (I have forgotten the correct name) to clear all the sludge that accumulates in the pipes, that's why it cant be done in an hour.

British gas will, and do charge too much for what they do to change a boiler.

I know all this because I am trying to get mine changed...

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I had 2 gas engineers looking at this and each one had a different theory.
The first one said that the gas pipe (I believe connecting the boiler to the gas meter?) needs to be changed as a combi system will require a bigger pipe, but the flue to the facade can be kept where it is (currently on side of boiler and not on top) as there are some models still having flue arranged this way.
The second one told me that the gas pipe can stay as it is, as apparently the fact that I have a gas cooker means the pipe is big enugh for a combi, but the flue will need to be located on the top of the boiler and a new opening in the facade needs to be provided.
At least both were in agreement that water pressure is enought o install a combi.
How can 2 opinions be so different? I guess the advice could be calling a third engineer, however, can anybody explain me the basics of changing from a system to another?

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Though on the market for over three decades, condensing boilers have only now began to gain the popularity they deserve, slowly replacing the “conventional” boiler. If you’ve been researching boilers, you’ve likely come across this term and wondered about the differences between conventional and condensing boilers. In short, the condensing boiler works much like a conventional boiler but comes at a premium price due to its increased efficiency and ability to save money on energy expenses.

If you’re considering buying a condensing boiler, this guide is up your alley. In this guide, we will look at the differences between the conventional boiler and the condensing boiler.

How Boilers Work

The boiler acts as the main source of a home’s central heating system. Within the boiler is a burner that requires a constant supply of natural gas, which is sent to your home from a pipe leading from your neighborhood’s gas main. A boiler begins working...

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I used them; and it was (is) a nightmare....

New Boiler was fitted on the 08Jan2011.
Stops working on 20Jan and won't stay on for more than a minute. We called Ace.

2 days later(22Jan), Ace Engineer says that air in the system was causing a valve to trip. He says that this is common with all new boilers. He bleeds the system; and says that this should not happen again for at least 1 year. Boiler is up.

Boiler stops working 4 days later (26Jan). Called Ace, **Also called British Gas for second opinion.
British Gas engineer said that the boiler was not fitted properly. Said "condenser not large" whih was
causing air to seep into the heating system, amongs other things. British Gas Engineer bleeds the sytem as well.
Emailed Ace with details from British Gas.

Boiler stops again (29Jan). Ace to send an engineer on Monday at 6pm, then on Thursday. No one shows up. Called to complain. Ace to send Engineer on Sat 02Feb at...

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Their are numerous ways to update your heating and numerous types of Boilers, the basic question is 'COST'.

New boilers are more cost efficient these days so it is up to you what you want out of it.

I prefer a storage tank type of heating combined with combi but the boiler cost us quite a lot more than conventional combi boilers.

Get British Gas to do a survey for you and talk you through the pros and Cons, the survey is free(well it used to be) and it should give you a clearer view of what you need to do from cost,work upheaval.

You could also download a table of heating etc from
which lets you see for yourself how each system performs.

Like John says, combis can be and are somewhat...

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What is a combination boiler??

A combi (or combination) boilers are a type of boiler in which gas is used for both high efficiency domestic water heater and central heating boiler within one compact unit. A combi boiler is an ingenious space-saving idea, and an increasingly popular choice in UK homes. They are easy to install, simple to use and economical to run. Installing a combi boiler might be a onetime hassle but your boiler still needs to be serviced every now and then, especially if you are experiencing strange noises or temperature fluctuations.

How does a combi boiler work?

The conventional arrangement of a boiler is to have a normal boiler that heats up the radiator through a sealed water circuit. To heat the water the storage cylinder has a hot coil in it through which the radiator water flows. A combi boiler heats the water only when a hot tap or shower is turned on. This ensures maximum efficiency of the boiler. The hot water is...

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