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  • Installing A New Combi Boiler Cost

    Central heating installation prices.

    To install central heating into an average three-bed property will cost around

    This type of job normally takes around 4-5 days to complete


    A central heating system can be powered by many fuels but always essentially consists of a heat source combined with connected heat outlets, most often this is a boiler and some radiators, but it could also be an underfloor heating system or even some of the more modern renewable heating solutions. Whatever type of central heating system you decide is best for your property, you will need a properly qualified heating engineer to install the system. The most common type of central heating system being installed in the UK is a condensing combi gas boiler with radiators.

    But there are many other types available including gas, oil, electric and LPG options. You can calculate roughly how many radiators you need using a number of online calculators, but better to simply ask your heating engineer to work this out for you. Moving from no central heating, or even an older inefficient central heating system, to a brand new modern and efficient system, will be expensive but will offer immediately increased levels of comfort plus greatly reduced heating bills.

    Getting quotes from reputable contractors is the best way to choose the right tradesman to install your new central heating system. is one of the best sites on the web for homeowners to find tradesmen. Simply enter details about the job you need doing along with contact information, then let put you in touch with up to three local tradesmen who can then offer quotations and further advice about the job.

    Average Combi Boiler Installation Costs

    Job DescriptionDurationMaterial CostLabour Cost
    A small bungalow install modern combi boiler with 3 radiators2-3 days£2200£600
    A terraced house install modern combi boiler with six radiators5-6 days£3000£1100
    Semi-detached 3 bedroom house install modern combi boiler with 9 radiators6-7 days£4200£1300
    Large detached house install modern combi boiler with 13 radiators7-8 days£5500£1450

    Things to consider about central heating

    The cost of installing a modern central heating system will depend on a number of factors including the current heating system installed in your home, the type of floors, the size and number of rooms, and the specification of the new boiler. There are many different types of central heating but gas central heating is by far the most popular in the UK. The reason gas central heating is so popular is that the running costs for gas almost always work out cheaper than electric, solid fuel or oil.

    In addition, oil-fired boilers and solid fuel central heating installations are much more expensive, it’s not just higher running costs, the up-front installation costs can be 50% higher or more! If you do not have access to mains gas, LPG is probably the next cheapest option, essentially still burning gas but the gas is delivered to your home by tanker and stored in a storage tank in your garden, rather than being supplied by underground pipes.

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    Doing it Yourself

    Central heating installations should be taken very seriously as it’s not an easy job and has serious safety implications, so should always be carried out only by professional engineers. Gas central heating systems should be installed by competent engineers registered with Gas Safe, solid fuel-burning boilers should be installed by a HETAS member, oil burning boilers should be fitted by an OFTEC (Oil Firing Technicians Association) member, while electric boilers need a qualified electrician for installation.

    If you choose to disregard these commendations and install your own central heating system, at least take advice from an experienced heating engineer with regard to choosing the right type of boiler and how many radiators are required. Once you have decided on a boiler and have worked out how many radiators you need to heat your home and where to install them, you should start by installing the radiators first then lay pipes from the radiators to the site of the proposed boiler installation.

    Install the boiler and connect to the pipework after which you can install the controls. Then turn the water on and allow the radiators to vent through before switching the boiler on and balancing the flow of heated water using the valves.

    Central heating checklist

    • An efficient central heating system is an integral part of a home in the UK
    • Gas central heating systems are the most popular type in the UK
    • High efficiency condensing gas boilers may convert as much as 90% of the fuel into useful heat
    • Electric central heating can be an affordable alternative if no mains gas


    Can I run a bath and shower at the same time with central heating?
    If you have a hot water storage cylinder you should be able to do both at the same time. But if you have a combi boiler which doesn't have a hot water storage cylinder, the boiler will split the water between the shower and the bath so you will end up with a reduced flow rate of hot water to both. If you need lots of hot water at the same time, it might be worth considering installing a system boiler with a large hot water storage cylinder so you always have enough hot water on demand.
    What is a condensing boiler?
    A condensing boiler is much more efficient with a much larger heat exchanger, which achieves over 90% fuel efficiency by extracting the heat from the flue gases which are normally lost to the atmosphere, then recycling that heat back into the heating system. The water vapour in the flue gases is then so cold it actually condenses (hence the name), and is taken away via a condensate pipe. Condensing boilers also do not need a pilot light because they fire up whenever there is a demand for heat.
    What is a back boiler?
    A back boiler unit is a boiler built into a fireplace, behind the fire. These were really popular back in the day when conventional boilers were much bigger and more difficult to install. Millions of these were sold and installed over the last 50 years. There is nothing wrong with these boilers per se, but they are an older design so not as efficient as modern heating systems.
    Why should I consider replacing my boiler?
    Most people today still only replace their boiler when it breaks down and they have to replace it! However, there are benefits to upgrading your boiler to a modern high-efficiency gas boiler without having to wait until you are left with no heating or hot water! Modern boilers are all high efficiency condensing models and older models are significantly less efficient and will cost a lot more to run. If your boiler is over 10 years old it is almost certainly worth replacing it for a modern system.
    What is the average cost of a new central heating system?
    The cost of a new central heating system will depend greatly on the type and size of property you own, which will, in turn, dictate the type and size of boiler required, along with the number of radiators. But a popular boiler such as the excellent Worcester Bosch 30kw combi with six radiators will work out at around £4400.
    Last updated by MyJobQuote on 7th May 2019.

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