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 1,463 customer responses collected between 09/12/2014 & 02/02/2015.

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

4,756 reviews

Reviews from: Sort by:
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Scores 9.0 out of 10 based on 4756 reviews
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1 out of 10


Its taken British Gas 6 years to sort out my problem and numerous visits from the engineers. It has cost me a fortune and I have never received any form of compensation.
Wish I had never used them in the first place. I must say their engineers are polite even if they don't know what they are doing.
Published on: 26 May 2015
8 out of 10


The engineer who installed the boiler could not have been more helpful on the day,particularly when the boiler which had been recommended could not be installed as agreed because the flue would not fit through my roof space. As a result of this a plasterer had to be called out to fill the hole the fitter had put in the ceiling to install the flue, and the boiler had to be fitted on the wall at a lower level than I had anticipated. None of this was the fault of the fitter but I was disappointed that the heating adviser did not take enough steps and measurements to ensure that the boiler he advised me to order could be fitted in my kitchen in the way he told me it would be, but at least it led to me getting a substantial refund on the price quoted as the lengthy flue he had ordered could not be fitted.
Published on: 26 May 2015
8 out of 10


Luton Homeowner
Heating advisor needs to be more diligent when doing the survey. The installation engine came across several issues that I think should of been flagged on the initial survey
Published on: 25 May 2015
10 out of 10


Lower Earley, READING, Berks. Homeowner
The Boiler-replacement went very well, from the booking of the Job to the Parts Delivery, finishing with the Rubbish Removal. The Contractor, who did the work, was excellent!
Published on: 25 May 2015
10 out of 10


The installation engineer was prompt, clean and installed the boiler with a minimum of fuss.
Published on: 25 May 2015