Why Choose Thames Boilers?

  • We'll beat any written quote by British Gas or EON
  • £449 worth of free bonuses with every new boiler fitted
  • 10 year parts and labour guarantee on all Viessmann, Worcester Bosch, and Viessmann boilers
  • Dartford based company working in the Kent & South London areas

What Are Other People Saying?

Answers to our customers' most common questions

How much will my new boiler cost me?

You can get a very good idea of the cost of a new boiler by using the free boiler quote tool here.

However, if you would like an exact price, and free expert advice, you should book a free home survey here.

How quickly can I have my new boiler installed?

Most of the time, within a week or two of you accepting your quote. However, if it's an emergency and you have no heating or hot water, we can rearrange other jobs to get your new boiler fitted in as little as 24 hours.

What guarantees do your boilers come with?

All our Vaillant, Viessmann and Worcester Bosch boilers come with a manufacturer's backed 10 year parts and labour guarantee. This means if anything goes wrong with your boiler in the first 10 years, the manufacturers will come out and fix it for free - including all parts and labour.

The only "catch" is that you need to make sure your boiler is serviced every year. We make this easy for you with our service plans that you can learn more about here.

How can I pay for my new boiler?

There are lots of ways you can pay for your new boiler. You can pay by:

What qualifications do your engineers have?

All our engineers, at a minimum:

  • Are Gas Safe Registered
  • ACS qualified
  • Hold public liability insurance

why buy your new boiler from us?

3 great reasons to choose Thames Boilers

Price Promise

Got a written boiler quote from British Gas or Eon? Just show it to us and we'll beat it. We'll also have an almighty good go at beating quotes from any other VAT registered company.

10 Year Guarantee

If you choose a Vaillant, Viessmann or Worcester Bosch boiler, you'll get a 10 year parts and labour guarantee. So if anything goes wrong with your boiler in the first 10 years, it will be fixed for free. The only catch is you need to have your boiler serviced once a year.

Finance Available

Finance is a very heavily regulated activity. So all we can so is this:

Boiler installation finance is available via Phoenix. You can learn more and view a payment calculator here.

£449 worth of free bonuses with every boiler installation

Yes - it's a shameless, barefaced, and unashamed bribe to get your business. And it might just work. Here are all the lovely freebies you get with your new boiler...

Free Magnetic Filter & Installation (Value: £185)

Every heating system should have a magnetic filter like this. It stops sludge from your radiators creeping into your boiler.

Sludge causes most boiler breakdowns and boiler manufacturers know this. So if they find sludge in your boiler on a call out, they'll invalidate your warranty on the spot. Not good.

To stop this, you'll get a Magnaclean Pro filter for free with your boiler installation. It'll prevent sludge from breaking your boiler, keep your warranty valid, and will save you about £30 extra a year on gas.* All for free.

Free 1 Year's Gold Service Plan Membership (Value: £239)

This is the highest level service plan we offer - and you get it free for a year with your new boiler installation. It includes breakdown cover for your whole heating system (not just your boiler), including callouts, parts and labour. It also covers your boiler's first service and a gas safety check. 

Free Carbon Monoxide Alarm (Value: £25)

You will get a free carbon monoxide alarm with your new boiler. Not that you'll ever need it - all new boilers are incredibly safe and ours are always installed to stringent British Standards. However, when it comes to your health, you can never be too safe. So we'll give you one for free anyway, so you know you're completely protected.

Award Winning Boiler Brands

Choose from these top boiler brands


Viessmann are the best boiler manufacturer you've never heard of. But don't let that put you off. They're huge in Europe and, like Vaillant, they're German and have been around for over 100 years. We love Viessmann at Thames Boilers because their build quality is as good as (if not better) than Vaillant and Worcester Bosch, but their prices are a little lower. This makes them great value - and Which? agree, giving Viessmann several Best Buy awards in recent years.


Vaillant are one of the best know boiler brands in the UK. They're a German company, based in Remscheid since 1874. They were arguably the first company to make a "combi" boiler back in the early 1960's. So they're very well established. Today, they're still considered one of the best boiler manufacturer's around, winning Which? Best Buy awards on a regular basis.

Worcester Bosch

Worcester Bosch are probably the best known boiler brand in the UK. Although now owned by the German giant, Bosch, Worcester is still very much a British company. Its boilers are still made in Warndon in Worcester. Like Vaillant and Viessmann, Worcester boilers have won several Which? Best Buy awards. If you want a high quality boiler, but still want to "buy British", then Worcester Bosch is an excellent choice. Although they are among the most expensive boilers we install.

Baxi / Main

Baxi is another great British boiler brand, who can trace their roots back to Richard Baxendale, an iron founder, who began the Baxendale Company in 1866, based in Preston in Lancashire. Today, Baxi also makes boilers under the Main and Potterton brands. We recommend Baxi boilers as the least disruptive replacement to some heat-only boilers - and their Main brand for people who want to keep costs down.

book a Home Survey with a heating engineer

This is a free service that gives you the chance to ask an expert about your boiler and heating system. 

You can also get a survey of your current system, advice on the best new boiler for you, and a written quote emailed within 24 hours.

Simply complete the form and we'll be in touch to arrange a date...

What times work best for you?
  •  Day time (9am-5pm)
  •  Evenings (7pm-9pm)
  •  Weekends (Sat & Sun, 9am-4pm)