Vaillant boilers

Vaillant have a reputation for producing boilers that combine outstanding performance and reliability.

Engineered in Germany and manufactured in the UK, their range of highly efficient ecoTEC combi boilers have won numerous awards.

Our Heating Advisers can help you choose the right boiler for you.

Or, take a look at the other boilers in our range.

Vaillant Combi boilers



Maximum  Flow Rate


Efficiency Rating

Vaillant ecoTEC Pro 24

H - 720mm

W - 440mm

D - 335mm

9.4 ltrs per min 23.4kW A-rated - 91%
Vaillant ecoTEC Pro 28

H - 720mm

W - 440mm

D - 335mm

11.5 ltrs per min
28kW A-rated - 91%
Vaillant ecoTEC Plus 831

H - 720mm

W - 440mm

D - 338mm

12.4 ltrs per min
31kW A-rated - 91%

Vaillant System boilers

Model Dimension Output Efficiency rating
Vaillant ecoTEC Plus 615 System

H - 720mm

W - 440mm

D - 338mm

15kW A-rated - 91%
Vaillant ecoTEC Plus 630 System

H - 720mm

W - 440mm

D - 372mm

30kW A-rated - 91%

More useful information

We have offers and discounts available for a limited time only.

Get an estimated cost for installing a new boiler.

A guide to getting a new boiler with British Gas.

Reasons to choose British Gas

Fixed price quote

We guarantee a fixed price

When our Heating Advisors quotes a price, we guarantee it won’t increase even if there’s unexpected work to do.

Boiler cost calculator

No deposit

Pay monthly with no upfront deposit

We could help you spread the cost over 3-10 years or you could choose to pay in full if you’d prefer.

Payment options

Your home is left clean and safe

Your home is left clean and safe

Our Engineers leave your home neat and tidy and will arrange the safe disposal of all waste.

Step by step guide

Free aftercare

Aftercare included

This offer includes HomeCare 200™ which provides service and repair for your boiler, controls and central heating system for one year.

Latest offers

British Gas New Heating Limited is authorised and regulated by the Financial Conduct Authority for its consumer credit activities. Registered in England and Wales 6723244.

[1] Mon-Fri 7:30am-8pm, Sat 8am-6pm, Sun 8:30am-5pm. Limited service applies during public holidays.

* 91% recommendation rating is based on 4,967 customer responses collected between 09/12/2014 & 15/06/2015.

91% of customers recommend British Gas boiler installations*. See below for more detail on how they rate it. Reevoo

British Gas Boiler Installation Service reviews verified by Reevoo

6,414 reviews

Reviews from: Sort by:
(9.0 out of 10)
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Advice from Heating Adviser
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Scores 9.0 out of 10 based on 6414 reviews
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(9 out of 10)


Llanharan Homeowner
installation was doing quickly and cleanly. Installers were very professional as well as being friendly.
1 of 1 people found this review helpful
Published on: 24 August 2015
(10 out of 10)


Batley Homeowner
Excellent service, from our initial enquiry (all details clearly explained by B.G.'s Engineer estimator) through to final efficient job completion by B.G.'s installer.
Published on: 24 August 2015
(9 out of 10)


Crook Homeowner
absolutely first class service from the team from start to finish as well as being courteous and information given great.
0 of 1 people found this review helpful
Published on: 24 August 2015
(9 out of 10)


Swaffham Homeowner
Great service. Arrived on time, if not before. Tidied up after themselves. Only difficulty now have to work out the new thermostat!
Published on: 24 August 2015
(9 out of 10)


Wirral Homeowner
The installation was more complicated than originally anticipated; I think the term 'old boiler out new boiler in' could not meet the boilers manufacturer specification, and so the new boiler had to be resited. This created a lot more work for the installer, but was completed satisfactorily to the original price. I also got a good discount as a loyal customer. The professionalism of the installers is to be highly recommended and together with a good price and backup of a large organisation why use the small guys?
Published on: 22 August 2015