31/05/2025
Contents
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.
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)
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:
Installation Type | Price Range |
---|---|
Standard combi boiler swap (same location) | £2,000 – £3,500 |
Full system conversion (from conventional) | £3,500 – £5,000+ |
Premium boiler with advanced controls | £3,000 – £4,500 |
Several key factors influence how much you’ll pay for a combi boiler and its installation:
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
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.
Property Type | Suggested Output | Impact on Price |
---|---|---|
1-bed flat | 24kW | Lower cost |
3-bed semi-detached | 28–32kW | Mid-range pricing |
4+ bed detached | 35kW+ | Higher cost |
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.
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.
New installations usually come with basic thermostats, but many homeowners now opt for smart controls such as Hive or Nest.
Control Type | Cost Range |
---|---|
Basic thermostat | £90 – £120 |
Smart controls | £150 – £250 |
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.
The price of a new boiler installation can vary significantly across the UK due to differences in labour costs, local competition, and demand.
Region | Average Cost (Standard Combi Install) | Notes |
---|---|---|
London | £2,800 – £4,500 | Higher labour costs; dense housing may add complexity |
South East (Surrey, Kent) | £2,600 – £4,200 | Competitive market with strong demand |
Midlands (Birmingham, Leicester) | £2,300 – £3,800 | Generally average UK rates |
North West (Manchester, Liverpool) | £2,200 – £3,600 | Slightly lower than UK average |
North East (Newcastle, Sunderland) | £2,000 – £3,400 | More affordable due to lower labour costs |
Scotland (Glasgow, Edinburgh) | £2,300 – £3,700 | Varies between urban and rural areas |
Wales | £2,200 – £3,600 | Costs vary by area and installer |
Yorkshire & Humber (Hull) | £2,300 – £3,500 | Competitive local pricing |
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
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)
While many boiler packages come with standard components, additional features or upgrades can increase the overall cost:
Optional Extra | Approx. Cost |
---|---|
Smart thermostat upgrade | +£100 – £200 |
Roof flue installation | +£500 – £600 |
Condensate pump | +£150 – £200 |
Moving boiler location | +£300 – £800+ |
New gas pipework (if needed) | +£100 – £400 |
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.
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.
If you’re looking for plumbing, gas or boiler advise or assistance, do not hesitate to contact our team today on 01482 770650 or book an engineer online.