✔ Combi boiler prices range from £500 to £2,500, excluding installation
✔ Getting your combi boiler installed costs between £500 and £1,500
✔ Fill in the form above to receive free boiler quotes from professional installers
Considering the cost of a new boiler? Combi boilers are a great option for homeowners in smaller properties and fewer people living in the house. They can also be powered by electricity, making them perfect for people who want to cut their household emissions and move away from fossil fuels.
Not sure what the difference between a combi boiler and a conventional boiler is? You’re certainly not alone. But it’s not as complicated as it seems.
We will guide you through the ins and outs of combi boilers and why – or why not – you should pick them in this article.
If you’re ready to start comparing boiler prices, simply fill in this form and you’ll receive free quotes.
In This Combi Boiler Guide:
- 01| Combi Boiler Prices in the UK
- 02| Combi Boiler Prices by Brand
- 03| Combi Boiler Installation Cost
- 04| Combi Boiler Service Cost
- 05| How Does a Combi Boiler Work?
- 06| FAQs
- 07| What’s next?
Combi Boiler Prices in the UK
Combi boiler prices will vary according to a number of factors, such as brand, model, efficiency rating, and power output.
The cheapest of combi boilers cost around £500, while top-of-the-range combi boilers can cost as much as £2,500.
Plus, there’s also the price of installation to consider.
For example, a Potterton Promax FSB 30 HE floor-standing combi boiler, which has an energy output of 30 kW, normally costs around £700.
A Worcester Bosch Greenstar Highflow 550CDi, on the other hand, delivers an output of 41 kW and is priced at approximately £1,900.
The former is ideal for a medium-size house with up to 15 radiators, while the latter will suit a larger property that has as many as five bedrooms.
The amount you pay will also depend on whether you choose a gas or oil combi boiler. Liquid Petroleum Gas (LPG) and electric combi boilers are available, too.
Oil boilers are typically more expensive than their gas counterparts and are usually favoured by homeowners living in more remote parts of the country (i.e. off-grid living).
This table gives you rough overall costs for combi boilers based on their output and fuel type:
Property Size | No. of Bedrooms | No. of Bathrooms | No. of Radiators | Output | Price Range (Gas) | Price Range (Oil) |
|---|---|---|---|---|---|---|
| Small | 1 to 2 | 1 | 10 max. | 24kW to 27kW | £425 to £2,990 | £1,600 to £3,700 |
| Medium | 3 to 4 | Up to 2 | 15 max. | 28kW to 34kW | £555 to £2,750 | £2,460 to £2,600 |
| Large | 4+ | 2+ | 20 max. | 35kW to 42kW | £765 to £1,430 | £2,330 to £2,925 |
Combi Boiler Prices by Brand
There are several boiler brands to choose from in the UK. Below, you’ll find prices for eight of the most popular manufacturers.
The examples given include the cheapest and the most expensive combi boilers produced by each brand, and are sourced from PlumbNation.
Baxi Combi Boiler Prices
Model | Fuel Type | Output | Warranty | Efficiency | Typical Price |
|---|---|---|---|---|---|
| 124 Combi | Gas | 24kW | 2 years | 89.1% | £614 |
| Platinum Combi 40 | Gas | 40kW | 10 years | 88.9% | £1,410 |
Glow-worm Combi Boiler Prices
Model | Fuel Type | Output | Warranty | Efficiency | Typical Price |
|---|---|---|---|---|---|
| Easicom 24 | Gas | 24kW | 3 years | 86 to 90% | £614 |
| Energy 35 Store | Gas | 35kW | 2 years | 93% | £1,605 |
Grant Combi Boiler Prices
Model | Fuel Type | Output | Warranty | Efficiency | Typical Price |
|---|---|---|---|---|---|
| Vortex Blue | Oil | 21kW | 2 years | 90.8% | £1,283 |
| Vortex Pro External 36 | Oil | 36kW | 2 years | 94.6% | £2,501 |
Ideal Combi Boiler Prices
Model | Fuel Type | Output | Warranty | Efficiency | Typical Price |
|---|---|---|---|---|---|
| Logic Combi 24 | Gas | 24kW | 2 years | 94% | £792 |
| Logic Code Combi ES 38 | Gas | 38kW | 2 years | 94% | £1,519 |
Potterton Combi Boiler Prices
Model | Fuel Type | Output | Warranty | Efficiency | Typical Price |
|---|---|---|---|---|---|
| Assure 25 | Gas | 25kW | 2 years | 93% | £797 |
| Assure 36 | Gas | 40kW | 2 years | 93% | £1,408 |
Vaillant Combi Boiler Prices
Model | Fuel Type | Output | Warranty | Efficiency | Typical Price |
|---|---|---|---|---|---|
| ecoTEC Pro 28 | Gas | 28kW | 2 years | 90% | £1,113 |
| ecoTEC Exclusive 838 | Gas | 38kW | 5 years | 90% | £1,408 |
Viessmann Combi Boiler Prices
Model | Fuel Type | Output | Warranty | Efficiency | Typical Price |
|---|---|---|---|---|---|
| Vitodens 050-W | Gas | 29kW | 3 years | 97.6% | £742 |
| Vitodens 200-W | Gas | 32kW | 3 years | 98% | £1,702 |
Worcester Bosch Combi Boiler Prices
Model | Fuel Type | Output | Warranty | Efficiency | Typical Price |
|---|---|---|---|---|---|
| Greenstar 2000 | Gas | 24kW | 5 years | 93% | £779 |
| Greenstar Highflow 550CDi | Gas | 30kW | 5 years | 92% | £2,471 |
Combi Boiler Installation Cost
When choosing your combi boiler, it’s also important to plan for your installation. Cost is of course a factor, but don’t be fooled into thinking that you should do it yourself.
Use the services of an accredited installer (a Gas Safe-registered engineer for an LPG or gas boiler, and an OFTEC-registered engineer for an oil boiler). It’s an absolute must.
A registered engineer will install your new combi boiler with minimum disruption and provide you with all the necessary documentation, including service records.
It’s also worth thinking about investing in boiler cover, which will protect you against breakdown, at the very least.
- Average cost of replacing a combi boiler: £3,000
- Average cost of replacing a different type of boiler with a combi: £3,600
For no-obligation quotes tailored to your needs, complete this form and get the best service around from trusted local installers.
Combi Boiler Service Cost
Annual servicing by a qualified engineer is just as important as ensuring that your combi boiler has been fitted by a registered installer.
Servicing prices will vary according to the type of coverage you require, and many people will choose a boiler cover to take care of this. For example, you can choose to cover the cost of the boiler – or the boiler and central heating.
You may also want to opt for comprehensive cover, which includes boiler, central heating, plumbing and wiring.
Bearing these points in mind, and the variety of prices set by different companies, servicing cover costs can begin at £60 and peak at around £120.
Of course, the more components you want to have covered, the greater the cost. This can be as little as £4.95 per month, and as much as £16.90 per month.
It’s also worth bearing in mind that you will likely be liable for a call-out fee for any boiler-related issues not covered by your service plan. Or, if all elements are covered, call-outs will normally be included.
You can read more about boiler servicing costs here.
How Does a Combi Boiler Work?
The ‘combi’ part of this boiler’s name is an abbreviation of ‘combination’, and comes from its ability to efficiently deliver hot water to kitchens, bathrooms and radiators. It provides both water heating and central heating, all in one innovative machine.
Water is heated directly from the mains, so there’s no need for an additional water storage cylinder (or a cold-water storage tank), which is typically installed in a property’s roof or loft space.
In recent years, the popularity of combi boilers in the UK has grown significantly.Now, more than 70% of homes opt for a combi boiler, as opposed to a conventional boiler
A major factor in the current popularity of combis is efficiency. Replacing an older boiler with a combi means it’s possible to make savings of up to £350 per year on energy bills – not something to be sniffed at.
Read our comprehensive combi boilers guide to discover the pros and cons, different system sizes, and whether to opt for electric, gas or oil.
FAQs
Which is the best combi boiler to buy?
The best combi boilers to buy are:
- Grant Vortex Pro Internal Combi 21e: £2,060
- Ideal Vogue Combi 32: £1,090
- Vaillant ecoTEC plus 838: £1,330
- Viessmann Vitodens 100-W Combi 30kW: £960
- Worcester-Bosch Greenstar Highflow 440 CDi ErP: £1,900
We recommend buying a combi boiler from Grant, Ideal, Vaillant, Viessmann, or Worcester Bosch. These brands make high quality combi boilers that have been praised by both homeowners and boiler engineers for their reliability and performance.
Can you buy a combi boiler on finance?
Yes, you can. If you don’t have the money to to buy a new combi boiler upfront, many installation companies offer a variety of finance options that allow you to spread the cost over a series of monthly payments, usually over the course of 12 to 36 months.
Interest is often added to the amount you pay back, however, meaning you’ll end up paying more for your combi boiler on finance than it’s actually worth.
How much can you save with a new combi boiler?
You can save hundreds of pounds on your energy bill every year by updating from a G-rated combi boiler to a new A-rated combi boiler.
For example, a semi-detached house can save up to £350 every year, while a detached house can save up to £570 a year. Most households will break-even on their new combi boiler within eight years.
How long should a combi boiler last?
A combi boiler should last up to 15 years before it needs replacing. If your combi boiler is approaching this age, you should think about investing in a new one.
To keep your combi boiler in a good condition for as long as possible, you should have it serviced at least once a year. This will ensure it’s working properly and safely, and will help to avoid any breakdowns.
What’s next?
After reading this, you should feel more like a combi boiler expert.
If, in your expert opinion, you think your boiler needs a little sprucing up, it’s time to head over to our short form.
Once you’ve done this, our local professional installers will get in touch with free boiler quotes. Happy heating!
