✔ Vaillant is one of the UK’s leading boiler manufacturers
✔ Vaillant makes gas boilers that cost between £850 and £2,500
✔ You can choose between more than 30 Vaillant boiler models
Researching new boiler costs? Consider looking at Valliant boilers, one the best-known manufacturers.
Read on to find out about the different boiler options that Vaillant provides.
Alternatively, you can skip the reading and pop your details in this short form — once you’ve provided your details, our expert installers will be in touch to give free boiler quotes.
What’s in this guide to Vaillant boilers?
02 | Vaillant combi boiler prices
03 | Vaillant conventional boiler prices
04 | Vaillant system boiler prices
07 | How do you buy a Vaillant boiler?
08 | Next steps
Vaillant boiler prices
Vaillant manufactures upwards of 30 models in combi, conventional and system designs. Its boilers come in a range of sizes, from 12kW up to a huge 65kW, designed to meet the heating and hot water demands of differently sized homes.
The price of Vaillant boilers typically ranges from £800 to £1,500, but can cost up to £3,000 for large models. As a rule of thumb, the bigger the Vaillant machine you need, the more it will cost.
The table below shows you the size and price range of Vaillant combi, conventional and system boilers currently available:
| Boiler Type | Size (kW) | Price Range |
| Combi | 25 to 48 | £900 to £2,100 |
| Conventional | 12 to 35 | £870 to £1,650 |
| System | 12 to 37 | £860 to £1,550 |
These prices are for the boiler only; they exclude installation costs. Installation typically costs between £500 and £1,500, depending on the complexity of the job.
For example, changing from one type of boiler to another, changing the location of your boiler, or moving and adding pipes will all drive up the cost.
To get more information about the cost of boiler installation, visit our page on how much a new boiler might cost.
Read on to get more information about how much combi, conventional and system boilers cost from Vaillant.
What Size Vaillant Boiler Do You Need?
You should choose which boiler size is right for your home based on a number of factors, including how many bathrooms, taps, and radiators your property has.
As a rough guide, here’s the power output you’ll need from your boiler:
- For a home with 1 bathroom and up to 10 radiators: 24kW to 27kW
- For a home with 1 or 2 bathrooms and up to 15 radiators: 28kW to 34kW
- For a home with 2 or more bathrooms and up to 20 radiators: 35kW to 42kW
Vaillant combi boiler prices
A combination or ‘combi’ boiler heats water directly from the mains when you turn on a tap or switch on your central heating. This means that unlike a conventional or system boiler, you won’t need a separate hot water cylinder or a cold water tank stored in your loft.
Vaillant makes a wide range of combi boilers that cost anywhere from £850 to £2,200, excluding installation. The company’s combi boilers come in ecoFIT pure, ecoTEC plus, ecoTEC pro and ecoTEC exclusive Green iQ models.
The table below shows you the price of Vaillant’s most popular combi boilers, as well as their size, energy efficiency and warranty period:
| Model | Size (kW) | Efficiency | Standard Warranty | Price |
| ecoFIT pure 412 | 12 | 94% | 2 years | £850 |
| ecoFIT pure 830 | 30 | 94% | 2 years | £1,000 |
| ecoTEC exclusive 835 | 35 | 94% | 5 years | £1,400 |
| ecoTEC plus 832 | 32 | 89.3% | 2 years | £1,500 |
| ecoTEC plus 435 | 35 | 94% | 5 years | £1,800 |
| ecoTEC pro 24kW | 24 | 94% | 2 years | £2,000 |
| ecoTEC pro 30kW | 30 | 93% | 2 years | £2,200 |
Vaillant conventional boiler prices
A conventional boiler, also known as a heat-only or regular boiler, needs both a hot water cylinder and a cold water tank to feed hot water to your radiators and taps/shower. These will both usually need to be stored in your loft.
Vaillant make conventional boilers in the ecoFIT pure and ecoTEC plus models that range in output from 12kW to 35kW. The price of Vaillant conventional boilers starts at £670 and goes up to £1,400.
The table below shows you the cost of popular Vaillant conventional boilers, and includes their size, efficiency and warranty period.
| Model | kW output | Efficiency | Standard Warranty | Price |
| ecoFIT pure 418 | 18 | 94% | 2 years | £841 |
| ecoFIT pure 425 | 25 | 94% | 2 years | £906 |
| ecoFIT pure 435 | 35 | 94% | 2 years | £1,457 |
| ecoTEC plus 415 | 15 | 94% | 5 years | £861 |
| ecoTEC plus 424 | 24 | 94% | 5 years | £1,031 |
| ecoTEC plus 430 | 30 | 94% | 5 years | £1,090 |
| ecoTEC plus 435 | 35 | 93% | 5 years | £1,539 |
Vaillant system boiler prices
Vaillant manufacture system boilers in the ecoFIT pure, ecoTEC plus, and ecoTEC exclusive Green iQ models. Prices start at £800 and go up to £3,000.
A system boiler heats water directly from the mains when you turn on your central heating, warming your radiators.
However, when you turn on your tap or shower, the hot water from your boiler is first pumped through a cylinder stored in the upper levels of your home.
The table below shows you the price of some of Vaillant’s most popular system boilers, including their size, efficiency and warranty period.
| Model | Size (kW) | Efficiency | Standard Warranty | Price |
| ecoFIT pure 618 | 18 | 94% | 2 years | £950 |
| ecoFIT pure 625 | 25 | 94% | 2 years | £1,000 |
| ecoFIT pure 630 | 30 | 94% | 2 years | £1,200 |
| ecoTEC exclusive Green iQ 627 | 27 | 94% | 5 years | £1,345 |
| ecoTEC plus 618 | 18 | 94% | 5 years | £1,120 |
| ecoTEC plus 624 | 24 | 94% | 5 years | £1,221 |
| ecoTEC plus 630 | 30 | 94% | 5 years | £1,347 |
Vaillant boiler reviews
Vaillant boilers have an excellent reputation among their customers and boiler engineers. The company has a 4.6/5 rating on Trustpilot, based on around 9,000 reviews.
Out of the thousands of customers who left feedback, 88% have rated the company as ‘excellent’ or ‘great’. Many customers have praised the quality of Vaillant’s boilers and their helpful engineers and support team.
Only of 7% of customers say they’ve had a ‘poor’ to ‘bad’ experience with Vaillant
Vaillant vs. competitors
While Vaillant is one of the best boiler manufacturers in the UK, there are a number of other brands that are worth considering.
Worcester Bosch, Viessmann, Grant and Ideal also feature alongside Vaillant in our list of the top five boiler manufacturers. Below is a quick rundown of the scores these companies have received from us and Trustpilot.
| Brand | Trustpilot Score | The Eco Experts Score |
| Grant | 9.5/10 | ★ ★ ★ ★ ★ |
| Ideal | 5.6/10 | ★ ★ ★ ★ ★ |
| Viessmann | 8.3/10 | ★ ★ ★ ★ ★ |
| Worcester Bosch | 9.1/10 | ★ ★ ★ ★ ★ |
As you can see, these boiler brands have scored similarly to Vaillant across the board (apart from Ideal), with Worcester Bosch and Grant receiving slightly higher scores than Vaillant from Trustpilot.
Ultimately the brand you choose – whether it’s Vaillant or one of its competitors – will come down to who offers the best boiler for your home and budget.
To get a quote for a new boiler from trusted boiler installers in your area, just fill in this short form to arrange a free home assessment.
How do you buy a Vaillant boiler?
Selecting the right boiler is an individual scenario and best assessed by a heating engineer to ensure you purchase the right type.
Vaillant encourages potential customers to join its installer loyalty scheme, Advance.
This way you are given access to their network of fully trained, independent installers who can offer you exclusive extended guarantees, as well as a free no obligation quote to assess which Vaillant boiler you need.
Next steps
Feel confident about that you know enough about Vaillant boilers? Hopefully now you’ll be sure whether this manufacturer is the right one for you.
Once you’ve made this decision, enter your details on our short form, and a local installer will be in contact with you shortly.
Happy heating!
