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

5,181 reviews

Reviews from: Sort by:
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Scores 9.0 out of 10 based on 5181 reviews
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10 out of 10


Reading Homeowner
All materials were delivered as arranged. All work was carried out as quoted and everything was left clean and tidy at the end of the installation. All flooring and worktops were covered where possible. I am a pensioner and the different engineers were all very affable and helpful where decisions had to be made which means a lot to someone living alone. I hasten to add that I did supply endless cups of tea (or cold drinks) to keep everyone happy!!! The engineer who was 'in charge' of the installation phoned me next day to make sure I did not have any problems.
0 of 1 people found this review helpful
Published on: 30 June 2015
10 out of 10


Brecon Homeowner
The advice and instalation was good, the instalation was done quite quickly and the new boiler is working very well.
6 of 8 people found this review helpful
Published on: 25 June 2015
5 out of 10


Stourbridge Homeowner
No discussion took part as to which boilers were available. We were told that the boiler would be better than our last one which is not the case. (May be more efficient). Hot water takes a very long time to reach the tap, let alone how much water is wasted getting to it. At the moment we don't use the hot tap as it takes too long to wait for it. My old water boiler was far quicker. New smart meter fitted but not registering usage at offices or on handset so can't see how much gas is being used by appliances as advertised, only electric. Several phone calls made (at my expense) but nothing done about it.
10 of 12 people found this review helpful
Published on: 25 June 2015
8 out of 10


Eckington, Pershore Homeowner
W e are delighted with the boiler and we are already feeling a difference.
I would have liked a fuller explanation from the person dealing with the
3 of 9 people found this review helpful
Published on: 24 June 2015
10 out of 10


Clifton, Swinton, Manchester Homeowner
Extremely pleased with every aspect of the job; very competent, professional and pleasant personnel.
5 of 8 people found this review helpful
Published on: 23 June 2015