How Much Is a New Combi Boiler with Installation?

When it’s time to replace your boiler, one of the first questions that comes to mind is: How much does a new combi boiler with installation actually cost? With energy efficiency, reliability, and peace of mind at stake, it’s important to understand what affects the overall price and how it can vary depending on your location, the complexity of the job, and your chosen boiler model.

In this guide, we’ll break down the average cost of a combi boiler installation in the UK, including a comparison of regional prices—featuring Hull and surrounding areas—alongside a clear explanation of what influences the final cost.

What is a Combi Boiler?

A combi (combination) boiler is a compact, all-in-one solution that provides both heating and hot water directly from the mains. Unlike conventional systems, there’s no need for a separate hot water cylinder or tanks in the loft, making them ideal for smaller properties or anyone looking to maximise space.

Key benefits of combi boilers include:

• Fast access to hot water on demand
• Improved energy efficiency
• Space-saving design
• Lower installation costs (in straightforward cases)

Typical Cost of a New Combi Boiler with Installation

As of May 2025, the average cost of a new combi boiler with installation in the UK ranges from £2,000 to £4,000, depending on several factors which we’ll explore below.

Here’s a general cost breakdown:

What Affects the Cost of a New Combi Boiler Installation?

Several key factors influence how much you’ll pay for a combi boiler and its installation:

1. Boiler Make and Model

Higher-end brands such as Worcester Bosch, Vaillant, and Viessmann come at a premium due to their build quality, energy efficiency, and warranties. Budget-friendly options like Ideal or Baxi may be more affordable but could offer shorter warranty periods.

Examples (supplied & fitted):

• Worcester Bosch 8000+ – from around £2,900
• Vaillant ecoTEC Plus – typically from £2,800
• Viessmann Vitodens 100-W – starting at £2,600–£3,000

2. Boiler Output (kW)

The size of your property and hot water demand will determine the right boiler output. Larger homes typically need a more powerful boiler, which increases cost.

3. Flue Type and Position

A standard horizontal flue (straight out of the wall) is the most affordable option. However, if the flue needs to go out through the roof or up multiple storeys, this can add £500–£600 to the total cost due to extra materials and labour. Even more in some cases if scaffolding is required.

4. Condensate Drainage

All modern combi boilers are condensing boilers and require a safe drainage route for condensate. If your property doesn’t allow for a gravity-fed solution, a condensate pump may be required, typically costing £150–£200 including installation.

5. Heating Controls

New installations usually come with basic thermostats, but many homeowners now opt for smart controls such as Hive or Nest.

6. System Conversion

If you’re upgrading from a conventional boiler (with tanks in the loft and a hot water cylinder), the process is more complex. It typically involves:

• Removing the tanks and cylinder
• Reconfiguring pipework
• Upgrading controls and flue

This conversion can add £1,000 or more to the final price.

Regional Boiler Installation Price Comparison (2025)

The price of a new boiler installation can vary significantly across the UK due to differences in labour costs, local competition, and demand.

Hull & Surrounding Areas (East Riding & North Lincolnshire)

If you’re based in Hull or nearby towns such as Beverley, Hessle, or Scunthorpe, pricing is competitive due to lower overheads and efficient local engineers.

At Kesselmann, our prices for a standard combi boiler installation range from £2,300 to £3,500, depending on your chosen boiler and job specifics.

For example:

• Worcester Bosch 2000 combi boiler (10-year warranty, standard flue, magnetic & limescale filters, new thermostat): from £2,300
• System conversion (removal of hot water cylinder and loft tanks): typically adds £1,000

What’s Included in a Typical Combi Boiler Installation?

Here’s what you can typically expect to be included when purchasing a new combi boiler with installation:

• Removal of your old boiler
• Supply and fit of new combi boiler
• Magnetic system filter
• Limescale reducer (where applicable)
• Chemical system flush
• Flue installation (horizontal)
• New heating controls
• Condensate pipework (gravity-fed)
• Registration with Gas Safe and building control
• Manufacturer’s warranty registration (up to 10 years)

Optional Extras That Can Add to the Cost

While many boiler packages come with standard components, additional features or upgrades can increase the overall cost:

How to Get the Best Value from Your Boiler Installation

1. Choose a reputable installer
Ensure your installer is Gas Safe registered and has experience with your chosen brand.

2. Don’t just go for the cheapest quote
Look for transparency and a full breakdown of what’s included. A cheap quote may exclude vital extras like filters or flushes.

3. Look at warranty length and brand reputation
A longer warranty can offer reassurance for years to come. Worcester Bosch, for instance, offers up to 10 years on select models.

4. Consider system upgrades now
If you’re planning on upgrading radiators or controls, it may be more cost-effective to do it during the installation.

Final Thoughts

The cost of a new combi boiler with installation in the UK depends on a wide range of factors—from the boiler make and output to the complexity of the job and even where you live. For homeowners in Hull and the surrounding areas, we offer reliable, competitively priced installations starting from £2,300, with options to suit most budgets.

Whether you’re replacing an existing combi or converting from a traditional system, it’s worth getting a few detailed quotes and discussing all aspects of the job with your installer so you know exactly what’s included.