Boiler replacement

Fixed-price, next day boiler replacement¹

Get a new boiler from £1,790 or £12 a month² with flexible finance options. Plus, get a free Hive Thermostat Mini with code FREEHIVEMINI*.

We'll beat any like-for-like price

UK's most trusted boiler installers

One year workmanship warranty on every installation

Next day boiler replacement

When your heating and hot water stop working, we know that the last thing you want is to wait days before a heating engineer can come and inspect the problem. That's why at BOXT, we offer next working day boiler replacement when you order your boiler before 3pm. Whether you have a system, gas, or combi boiler, your heating will be back up and running before you can say, "Wow, that was easy!" 

Plus, with a 12 month workmanship guarantee, and up to 12 year manufacturer-backed warranty, you can relax knowing that in the unlikely event that something isn't quite right, you're completely covered and we'll work with you to make it right. 

Should I replace my boiler?

In some cases, you may not need to replace your boiler if there's a minor fault that can be fixed. Typically, the newer the boiler is, the more likely a repair will suffice rather than a full replacement. However, the older your boiler is, the more likely a boiler replacement would be the better option in the long run. 

Signs your boiler may need replacing

  1. Leaks or dripping pipes
  2. Repeated low water pressure
  3. Banging or gurgling noises
  4. Odd smells
  5. You can’t find the parts needed
  6. Higher energy bills
  7. Not enough hot water
  8. Frequent breakdowns

How BOXT works

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Discover

Answer some questions about your home and get a tailored boiler replacement quote in minutes.

Choose

Compare brands, models and sizes to choose the perfect boiler for your home. Pay upfront or spread the cost in instalments.

Install

Order online by 3pm to have your replacement boiler installed next working day by a BOXT accredited engineer.

Maintain

Download the BOXT app to keep track of your installation and view all your important documents.

Need a boiler replacement?

Worcester Bosch Greenstar 4000

The UK's best-selling boiler, with a new & improved design

Our most popular model and one of the quietest combi boilers available, the Greenstar 4000 is perfect for small and medium sized homes.

Get a quote

Navien NCB 300

Quality performance, without the price tag

Featuring a smart digital display so you can easily control your heating and hot water, plus a stainless steel heat exchanger to provide long-term efficiency.

Get a quote

Vaillant ecoFIT Pure

Flexibility to fit almost anywhere

This compact model fits seamlessly into your home, while offering plenty of power with quality components to ensure long-lasting reliability and efficiency.

Get a quote

Worcester Bosch Greenstar 8000+

Super powerful, super efficient

One of the most powerful wall-hung boilers on the market, with amazing performance for a range of home sizes whilst working intelligently and efficiently.

Get a quote

When to replace your boiler

Your boiler will last 10-15 years on average, if serviced and properly maintained. 

Generally, a boiler that has been annually serviced by a Gas Safe registered engineer should last you longer than a boiler that hasn't been serviced. This is because a service can find issues arising before they turn into more serious faults, preventing your boiler from working. 

A boiler lasting 10-15 years is an estimate and will differ by manufacturer and how well your central heating system has been maintained.

Why get a boiler replacement?

Even if your current boiler is still working, it’s worth considering getting a boiler replacement before you're left without heating or hot water when you need it most—especially if your boiler is over 15 years old.

A key reason it's worth upgrading older boilers is because modern gas boilers are more energy efficient than old ones. In fact, depending on how old your existing boiler is and the type of home you live in, you could save over £500 a year on your energy bills with a new, A-rated boiler! 

Plus with the addition of smart technology, it's simple to build a heating schedule and control the temperature in your home from anywhere. In fact, this extra efficiency can help save up to an extra 10% on your energy bills.

Flexible boiler replacement payment options

Spread the entire cost on selected boilers with up to 36 payments at 0%

Finance from 12-120 months

All-inclusive worry-free BOXT Life boiler plan from £33.35 a month

120 month boiler plan

All major credit and debit cards accepted so you can pay in full today

Pay today

Get your fixed price

Comparing boiler replacement costs?

Make new boiler installation simple with BOXT. We enjoy saving you time and money; that's why we regularly review our prices. In fact, we guarantee to beat any like-for-like boiler installation quote by £50, so you can shop with peace of mind.

Rated Excellent on Trustpilot

Boiler replacements from leading brands

We’re creatures of habit, and that’s a-ok. BOXT stocks energy-efficient boilers from all the leading brands, meaning you can get a replacement you know you’ll love.

The home heating industry can be complicated, but with BOXT, it doesn’t have to be. Explore boilers from trusted brands to find your perfect replacement.

Want to know more about replacing your boiler?

Check out our advice guides full of hints and tips from our expert BOXT accredited engineers.

Boiler replacement questions

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Ready to get your boiler replacement?

*Saving of £173.55 based on the Ofgem medium annual gas consumption of 11,500 kWh at the October 2025 UK average unit price of 6.288 pence per kWh including VAT. Emissions saved per year: 508 kg CO2 (0.184kg per kWh). Actual savings will vary depending on individual circumstances. Terms and conditions apply to Free Hive Mini promotion.

¹Next working day installation when you order before 3pm, subject to availability. 

²New boiler prices start from £12 a month with a 50% deposit.