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New Combi Boiler Installation: Guide and Costs 2024
- It can take just 1 or 2 days to install a new combi boiler, depending on the complexity of the replacement.
- A new combi boiler can improve your energy efficiency, reduce carbon emissions and save you up to £430 a year on fuel bills.
- It can cost between £1,100 to £7,000 to install a new combi boiler.
Combi boilers are a popular choice for homeowners due to their high efficiency, space-saving design, and ability to provide instant hot water on demand. If you're considering upgrading your heating system, a new combi boiler installation could be the perfect solution.
In this guide, we’ll explain the whole process of replacing an existing boiler, and how a combi boiler is installed. We’ll look at the advantages of upgrading your heating system, and break down all the costs that are involved.
If you're ready to replace your old boiler with a new combi boiler, we highly recommend sourcing several quotes from qualified installers. This way, you can compare costs to find the best deal.
We know it can be stressful searching the web for hours, scrolling through reviews and having to contact different companies just to find a price. Why not avoid all that stress, save your precious time and let us help instead!
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Combi boiler installation: Step by step guide
Installing a new combi boiler is typically a very simple process, as there is just one compact unit to fit (this is one the main perks to choosing a combi!). The steps involved, however, can differ depending on your own circumstances.
For example, a like-for-like combi replacement should be a straightforward swap, but if you are looking to move the boiler's location or upgrade from an older system (such as a regular boiler), there will be more work and steps involved.
Combi boiler installation diagram
To get a better idea of how a combi boiler installation works, we’ve outlined the most common steps below.
A typical combi boiler installation involves the following key steps:
- Removing the old boiler:
The installer will carefully remove your existing boiler, including the flue pipe and any associated pipework. - Preparation of the installation area:
The installer will then clean the area where the new boiler will be installed and ensure that the walls and floor are suitable for the installation. This will also include checking existing pipework, conducting a ‘system flush’ (to remove any rust/debris from the entire system) or repairing any issues.
If you are moving the boiler to a new location or upgrading your system, additional work may be carried out to ensure all pipework is in place, or old parts are disconnected/removed. - Installation of the new boiler:
The new combi boiler will be lifted into place and securely mounted to the wall. The installer will connect the boiler to the fuel and water supply pipes, as well as the central heating system.
If you're running a gas or oil-powered combi boiler, the flue pipe will also be installed to allow for the safe venting of combustion gases. (This step is not applicable to electric combi boilers). - System testing and safety checks:
The installer will then test the boiler's operation to ensure that it is working correctly. This may involve checking the water pressure, gas flow, and heating output.
They will also conduct safety checks to ensure that the installation complies with building regulations and safety standards. - Customer briefing:
Finally, the installer will provide you with a detailed briefing on how to operate your new combi boiler. They will also explain any safety precautions that need to be followed - and then you’re ready to enjoy your new combi!
The exact steps involved in the installation process may vary depending on the specific model of the boiler, the layout of your home, and any additional requirements or constraints you have.
How long does it take to fit a boiler
In most cases, it takes just 1 or 2 days to install a new combi boiler. However, this can vary depending on several factors. For example, if you are installing a boiler in a new location or wish to upgrade from an older, larger boiler.
Here are some examples of the average time needed per installation type:
Like-for-like replacement:
If you are replacing an old combi boiler with a new one of the same type in the same location, the installation typically takes 4 to 6 hours (1 day). This is the quickest scenario as it involves minimal changes to existing pipework and connections.
New installation:
If you are installing a completely new combi boiler where none previously existed, the process generally takes 1 to 2 days. This timeframe accounts for the need to connect to water and gas mains, as well as possibly installing new heating controls.
Relocation of boiler:
If you wish to move an existing boiler to a new location, expect the installation to take 1 to 2 days. This is due to the need for new pipework and possibly some structural adjustments.
Changing boiler types:
If you are switching from a different type of boiler (e.g. from a system or regular boiler to a combi boiler), this can take 2 to 3 days (or longer). This is because more extensive changes are needed, including the removal of old components (such as water tanks).
Combi boiler installation cost: How much is it?
The boiler replacement cost to install a new combi boiler is made up of two elements: the new boiler cost and installation fees. Typically the overall cost to replace a combi boiler is between £1,100 and £7,000.
Costs will differ depending on the boiler model/brand, warranties, and complexity of the installation. The biggest factor affecting cost, however, will be the type of boiler replacement you need. For example, if you are swapping boiler types or simply replacing like-for-like.
Combi to combi boiler replacement
One of the cheapest options is to replace an existing combi boiler with a new combi. These are usually less expensive installations, as they are straightforward swaps, with most new combi boiler models made for quick, ‘lift and fit’ installs.
The cost to replace an existing combi boiler with a new combi boiler ranges from £1,100 to £3,500. This includes both the price of the new boiler and installation costs.
| Combi to combi replacement | Prices |
|---|---|
| Boiler cost | £500 - £2,000 |
| Installation cost | £600 - £1,500 |
| Total cost | £1,100 - £3,500 |
Conventional to combi installation
Replacing a conventional boiler with a new combi boiler can be the most costly type of combi installation, averaging £1,600 to £7,000.
Conventional boilers use a water tank and a hot water cylinder, which will need to be removed. This additional work can result in extra installer time and possibly materials to ensure the old system is disconnected safely.
In addition, a typical combi boiler won’t provide the same high hot water output as a conventional boiler; therefore, you may end up spending more on a combi with a higher power output or inbuilt water storage options.
| Conventional to combi replacement | Prices |
|---|---|
| Boiler cost | £600 - £3,500 |
| Installation cost | £1,000 - £3,500 |
| Total cost | £1,600 - £7,000 |
System to combi installation
It’s less common for households to switch out a system boiler for a combi, as system boilers can provide for a higher hot water demand. If you find you need a less powerful system, however, and also want to save space, then a high-powered combi (or storage combi) can be a great replacement option.
These installations will also incur slightly higher installation fees, as a hot water cylinder will need to be removed and pipework correctly placed. The average cost for a system to combi replacement is between £1,500 and £5,600.
| System to combi replacement | Prices |
|---|---|
| Boiler cost | £500 - £3,000 |
| Installation cost | £1,000 - £2,600 |
| Total cost | £1,500 - £5,600 |
Additional cost factors to keep in mind include:
- Boiler brands: Combi boiler prices vary significantly based on the manufacturer and specific model chosen.
- Boiler size/output: Higher capacity boilers for larger homes tend to be more expensive.
- Warranty period: Extended warranties often increase the overall cost.
- Optional extras: System flushes, magnetic filters, and smart heating controls are just some of the extras you may be offered during installation. Each extra has its own associated costs, but you might want to consider the benefits of adding protective measures to your system to ensure longevity or increase efficiency.
If you’re ready to replace an old, unreliable boiler with a shiny new, efficient combi, the first step is to speak to installers and compare prices - but we know this is easier said than done!
Searching for trusted, qualified boiler installers can be a long process. Endless scrolling and form filling, over and over again, is stressful and a huge waste of your time. So why not avoid all this hassle, and let us help instead.
Fill in one 30-second form and we’ll do all the leg work. We’ll find up to 3 installers, local to you, who will provide you with quotes. Then you can compare costs and choose a deal that suits you. Oh, and it’s also completely free! (with no obligation attached).
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Benefits of installing a new combi boiler
Combi boilers are highly efficient, compact boilers that can effectively heat most homes. In recent years, some combi models have become up to 94% efficient, making them some of the most efficient boilers available.
In addition, some of the best boiler brands now offer even more powerful combi output sizes and storage-combi models. This makes them not only money-savers but a suitable option for many homes.
Upgrading to a new combi boiler can be a worthwhile investment that offers numerous benefits, including:
- Improved energy efficiency:
Combi boilers are generally more energy-efficient than older boiler types, with efficiencies between 92 - 94%, which can help you save money on your energy bills. - Instant hot water:
With a combi boiler, you'll have instant hot water on demand without having to wait for a storage tank to heat up. - Space-saving:
Combi boilers are compact and don't require additional cold water tanks or hot water cylinders, making them ideal for smaller homes or those with limited space. - Reduced maintenance:
Combi boilers typically require less maintenance than older boiler types, saving you time and money. - Increased comfort:
A new combi boiler can provide more consistent heating and hot water, improving your overall comfort. - Increased home value:
Installing a new combi boiler can potentially increase the value of your home.
Storage-combi boilers are a type of hybrid model that includes hot water cylinders within the boiler unit itself. These models can offer homeowners the same compact benefits of a combi boiler with the added hot water storage capabilities of a system boiler.
What to consider when installing a new combi boiler
When considering installing a new combi boiler, there are several factors you should take into account. These include:
- Home size and hot water demand:
The size of your home and your hot water usage requirements will help determine the appropriate size and capacity of the combi boiler. If your home has more than two bathrooms, it’s likely you will need a large output.
For some homes, a system boiler (with a separate hot water storage tank) will be the more appropriate choice to ensure you have adequate hot water on demand.
- Water pressure:
In order to effectively supply your home with water, a combi boiler relies on your mains water pressure. If your area has low pressure, a combi may struggle to supply your taps with adequate water flow. If you’re unsure about this aspect, consult your heating engineer who will be able to advise you on the best boiler option for your area.
- Energy efficiency:
Upgrading your boiler gives you a great opportunity to look for a more energy-efficient option to help save you money on your heating bills. Look for a boiler with an efficiency of 92% or above to ensure you get the most from the fuel you burn. You can also check the energy efficiency designation (ErP label), which marks the appliance from A to G for efficiency. Anything A or above (e.g. A++) is over 90% efficient.
- Warranty:
A longer warranty can provide peace of mind and protection against unexpected repairs. To get the most from a warranty, check that it includes ‘parts and labour’ and try to find a model with at least 10 or more years of warranty - not only does this protect you for a long time, but also indicates that the brand has great faith in these models!
- Installer qualifications:
If you’re installing a gas combi boiler, the installation must be done by a Gas Safe registered engineer. Not only is this necessary to comply with building safety regulations, but it also ensures your engineer has the correct skills and experience to safely work with gas.
Similarly, if you choose to install an oil combi boiler, you should check if they are an OFTEC registered technician (Oil Firing Technical Association), which is a similar requirement for those fitting oil-fueled appliances.
By carefully considering these factors, you can choose a combi boiler that meets your needs, provides long-term benefits and is fitted to the highest safety standard.
When should you get a new combi boiler fitted?
If you’re experiencing ongoing problems with your combi boiler, or your hot water and heating in general, these are signs you might need a new boiler. We’ve listed below some of the common issues that can indicate it’s time to upgrade:
- Frequent breakdowns:
If your boiler is constantly breaking down or requiring frequent repairs, it may be more cost-effective (and safer) to replace it. - Lack of hot water:
If you're struggling to get enough hot water, it could be a symptom of a failing boiler. - Noise and vibrations:
Excessive noise or vibrations from your boiler can be a sign of a problem. It’s important to get these checked as soon as possible. - Cold spots in your home:
If you're experiencing cold spots in certain rooms, it may indicate that your boiler is not heating your home efficiently. - Old age:
Boilers typically have a lifespan of 10-15 years. If your boiler is nearing or exceeding this age, it may be time for a replacement. As a boiler ages, it loses efficiency and can lead to issues we’ve mentioned above. - Increasing energy bills:
If you've noticed a significant increase in your energy bills (not linked to energy prices), it could be due to an inefficient boiler.
If any of these issues sound familiar, it's a good idea to have your boiler inspected by a professional. They can assess the condition of your boiler and recommend whether it needs to be replaced.
If you smell gas, call the Gas Emergency Services immediately on 0800 111 999, open 24/7 – they will advise you on what to do next. If you have a gas leak, open doors and windows and turn off your gas supply at the meter (only if accessible) and evacuate the building.
Find a combi boiler installer
We all want to get the best price when it comes to upgrading essential appliances for our homes. The good news is that by choosing a new combi boiler, you could save up to £430 a year on your energy bills. In addition, some homeowners may be eligible for financial support with access to a new boiler grant, through the ECO4 scheme.
When it comes to installing a new combi boiler, however, it's essential to find qualified, trusted professionals to safely carry out the work. Getting quotes from multiple installers also allows you to compare prices and ensure you're getting the best deal.
Finding a combi boiler installer can be a daunting task, with a lot of time and research required to find someone you can trust and who won’t overcharge you. That’s where we can help! At Household Quotes we have a network of qualified, vetted, professionals ready to support you.
Using our simple 30-second form, you can connect with up to 3 reputable heating installers in your area. These installers will provide you with free, no-obligation quotes, allowing you to compare prices and services before making a decision.
By using our service, you can save hours of time and effort while ensuring you get the best possible deal on your new combi boiler installation.
Click below to get started.
- Quotes from local installers
- Payment by finance available
- Save up to £975
