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Boiler Installation: Cost Guide For Combi Boilers

There's a lot to learn about new boilers, there's even more to learn about new boiler installations. From costs to things you should consider, here's Heatable's boiler installation guide for beginners.

A boiler installation is a big investment and often a decision that is made in a hurry when your current boiler has broken down.

Typically, this happens during winter, when having your hot water and heating working is more important than ever.

...Winter, why do boilers always break down in winter?!

Unfortunately, buying a new boiler and getting it installed have traditionally been a complicated and expensive process.

Thankfully, we fixed all this, with our quick boiler quote calculator (takes 60 seconds). 

In this guide, we’ll provide you with an overview of all the important factors to consider for your new boiler installation and those which our boiler quote calculator will take into account. 

Boiler Installations from Heatable - here’s how it works:  

Heatable Boiler Installations

We’ve made the process of choosing a new reliable boiler and securing an installation date easier than ever. Here’s how our process works: 

  • Find the best boiler for your home using our quick tool.
  • Buy your new boiler online without having to talk to salespeople and escape the hidden extras they often try to sell you. You can pay for the new boiler installation in multiple ways, either cash, credit or pay monthly finance
  • We will then come and install your new boiler the next day, subject to the availability of our Gas Safe Engineers. 

Boiler Installation Costs - How much does a new boiler cost?

Boiler Installation Costs

The cost of a new boiler installation is often one of the very first considerations for anyone in the market for a new boiler and gas safe installation, so how much should you expect to pay? 

Let’s face it - boiler installations are never as cheap as we want them to be

But for a modern, efficient boiler that performs the important role of keeping your home supplied with hot water and heating for over a decade, it’s worth the investment. 

Boiler installation costs can vary significantly, which is dependant on numerous factors, these can be summarised as follows: 

  • The type of boiler you have installed e.g. combi or system
  • The model you choose e.g. mid-range vs. premium
  • If you want to move your boiler to a different location
  • If you want to convert from one boiler type to another
  • Any extras you purchase e.g. smart thermostats, filters etc

For illustration, a straightforward combi swap (installing a new combi boiler in place of your current one) is going to be less expensive than converting from a different type of boiler to another e.g. from a combi to a system boiler. 


...Why does it cost more?

They are typically more complex installations, requiring more time, more labour and more materials. 

Worcester Bosch Boiler InstallationThe boiler model you choose also impacts price, for example, we offer maximum value brands like Alpha boilers, as well as premium, award winning boilers, such as Worcester Bosch and Viessmann. 

However, bear in mind that according to the Which? annual boiler survey, the least reliable brand is more than three times as likely to break down, compared to the best.

The great news is that you can pay for our boilers in multiple ways including cash and finance via a pay monthly boiler scheme

For a more in-depth explanation of boiler costs, along with common examples, check out our new boiler costs guide. 

Boiler Installation - Factors to consider 

Boiler Installation Factors

Since your boiler is not an inexpensive item, it’s essential to consider some important factors, before making a decision, these include the following: 

Note: you don’t have to worry about being a boiler expert, we designed our boiler quote tool to help you choose the best boiler for your home in under 60 seconds.  

What size boiler do you need? (kW output) 

Boiler kW InstallationThe size of a boiler usually refers to the boiler’s power output and not it’s physical dimensions. 

A boiler's power is measured in kilowatts (kW), so in simple terms, the higher the kW, the greater the capacity of the boiler to meet your properties hot water and heating demands. 

The majority of boiler manufacturers offer their boilers in a variety of different sizes. Your boiler installer can help you work out what size boiler you need, or you can use our quick, free calculator here

For example, if you live in a small flat, then a small combi boiler is likely going to be recommended. 

However, if your property is a large four bedroom property with multiple radiators and bathrooms, you are likely going to be recommended a large boiler to meet your hot water and heating demands comments professional house buyer Paul Gibbens. 

Do you want to move your boiler? 

Boiler Relocation Installation

It’s not uncommon for people to want to have their new boiler installed in a different location than their old one. However, it’s important to note that this will incur extra costs and so it typically makes financial sense to keep your boiler in the same location. 

...why does it cost more? 

Moving a boiler means that the pipework also has to be moved, this often means re-routing it through your home, as well as the installation of a new flue. All of this not only takes more time, but requires more labour and materials. 

Boiler Installation time 

Boiler Installation TimescalesIt’s also crucial to be aware of how long the boiler installation may take, as some installations are inherently more complicated and so require more time to complete. 

For instance, a regular combi swap i.e. replacing your old combi boiler with a new combi boiler exactly where it was takes around a day on average. 

However, if you are having your boiler converted to a different type e.g. a combi to a system, it usually takes around 2 days to complete. 

Boiler manufacturers to choose from 

Perhaps one of the most important considerations is the boiler brand you choose, since not all boilers are made equal. The good news is that Heatable offers a range of boiler types from reputable, award winning brands, these include the following: 

Worcester Bosch boiler installation

Worcester Bosch Boilers Installation

Worcester Bosch remains one of the UK’s most popular boiler brands and for good reason, not only do they hold a royal warrant, but they have been awarded a Which? Best Buy Award for 10 consecutive years.

Why else do we recommend and install Worcester Bosch boilers? 

  • Which? Best Buy Award for 10-years running 
  • 10-year guarantee (when purchased via Heatable)
  • Availability of parts is second to none 
  • Excellent customer reviews and aftercare
  • High efficiency A-rated boilers 

Check out our Worcester Bosch reviews here: 

Viessmann boiler installation

Viessmann Boilers Logo

Viessmann are another award winning boiler manufacturer that benefit from German engineering and are renowned for their simple, crisp designs and technical brilliance.


Viessmann boilers are technically brilliant, for example, they use a stainless steel heat exchanger instead of the typical aluminium variety found in most other rival brands. 

Stainless steel is more durable, better able to deal with sludge and withstand years of corrosion, two major culprits of boiler faults and failures.

Boiler Installation Heat Exchanger

Check out our Viessmann reviews here: 

Alpha boiler installation 

Alpha Boiler Logo

Alpha Innovations are a relatively new boiler brand in the UK market, but one that is growing in popularity due to their highly competitive pricing and high quality build. 

They are an ideal option for those on a budget looking for a reliable and affordable heating solution with a generous warranty (10 years exclusive to Heatable).

Check out our Alpha reviews here: 

Boiler Installation Finance Options

Boilers Finance Installation

A new boiler installation is not cheap, so if you are finding it difficult to pay for it all upfront, you may be able to take advantage of a range of boiler finance options. 

If you meet the lenders eligibility criteria, you can potentially pay for your boiler in instalments over a 3, 5, 7 or 10 year period. 

Pay monthly finance summary of details: 

  • No deposit required (up to 50% optional). 
  • Make overpayments with no penalty. 
  • Spread the cost over 3,5,7 or 10 years.
  • Interest rates from 9.9% APR.

Learn more about boilers on finance.

If you live in an average-sized home, see our guide on choosing the best boiler for a 3 bedroom house

Get a boiler installation quote today 

Use our new boiler quote tool and we could be fitting your new boiler tomorrow.

Our tool provides you with a fixed price quote for your specific needs, taking into account your property type, hot water demands and budget to provide you with a boiler installation cost that is accurate. 

TrustPilot Heatable

It will provide you with a range of recommended boiler models from the brands we work with. 

At Heatable, we believe it’s important to secure a new boiler that offers the following combination: 

  • A long warranty (10 years).
  • A Which? Best Buy (or another industry award winner).
  • High TrustPilot ratings or reviews for customer service.

That is why our new boiler deals meet these criteria. 

Use this clickable form to get a fixed price on the screen instantly.

More advice

New boiler deals

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Heatable is registered in England and Wales No. 08804726 (VAT No. GB205805920 ). Trading address is 1 Station Road, Great Sankey, Warrington, Cheshire, WA5 1RH. Heatable acts as a credit broker (not as a lender) and offers credit products through a panel of lenders. Heatable is authorised and regulated by the Financial Conduct Authority (reference no. 805259).

[1] Price based on a like for like combi swap in a 2 bed, 1 bathroom terraced home with a standard flue

[*] Installation dates are subject to installer availability

[ยน] only available on combi boiler installations

Financial Support: If you are in receipt of certain benefits, you may be entitled to claim a free boiler grant.