Replacement Boilers - Should I repair or replace my boiler?

#Buying Guide

Replacing your boiler can be daunting but we're here to help

It's probably the hardest working appliance in your home, but your boiler is definitely one of the most under-appreciated, along with the cooker, wi-fi and lighting it is unthinkable as to how you would manage without it.

Your boiler keeps you warm when it’s cold outside, gives you hot water for that long soak in the bath and even allows you to do the dreaded washing up. So, it’s vital that your boiler is working as efficiently as possible at all times.

More often than not you will only be thinking about replacing your boiler when it has already broken down or is getting really old e.g. 15 years plus. When this happens you really do need to spend some time learning about boilers and understand what is best for your home. The technical jargon can be very confusing, “Where is your flue?”, “Is it a combi or a standard?”. That is where we are here to help you. All you need to do is answer a few simple questions and we will recommend the most suitable boilers for your home and give you all the info you need to be sure you're choosing the right one.

Should I repair or replace my boiler?

What can I do before replacing my old boiler?

If your boiler has given up the ghost or isn’t as efficient as it once was, you could look into having it repaired. You have a few options here.

  • Does your boiler still have a valid warranty?
    It is worth checking with the manufacturer as some boiler warranties cover parts and labour. Even if it just covers the parts this might help to reduce the amount you have to pay.
  • Contact a local gas engineer.
    Before you let anyone look at your boiler make sure they are Gas Safe registered. Ask the local engineer for his Gas Safe licence number and check they are still fully licenced to do the work -
  • Do your research?
    It can be tempting to just go with one of the energy suppliers e.g. British Gas or a local installer recommended by a friend. But it is well worth getting a few quotes as you might find you can get a lot more for your money by shopping around.

When should I replace my boiler?

The average lifespan of a boiler is around 10-15 years. If yours is approaching that age, then you should think about saving up for a new one or consider buying on finance. It is possible to keep your boiler going for many years as long as you make sure you have a boiler service done at least once a year. They help to keep your boilers efficient and lower the risk of faults occurring. Think about it like an MOT for your car.

If your boiler breaks down and you are thinking of having it repaired, this can sometimes be as expensive as a brand new boiler. You could easily have more problems with a repaired boiler further down the line. A brand new boiler is usually more efficient and more reliable.

Don’t forget if you do get a new boiler it will be covered by a warranty too – so if it breaks, the manufacturer will repair it with no extra charge.

How much does it cost to replace a boiler?

The cost of a brand new A-rated boiler, a brand new flue, all the right fixtures, fittings & safety attachments and installation from a Gas Safe Registered engineer would traditionally cost between £2,500 and £4,000.

BOXT can offer you an A-rated boiler, flue, attachments and Gas Safe registered installation from £1,695, or from £10.96 a month, including VAT.

Boxt Gas Installation

What type of boiler should I replace my current boiler with?

First, you should start by identifying your current boiler system, your options are:

  • Combi
    Combi boilers heat water directly from the mains when you turn on a tap. So you get hot water instantly – without a cylinder or a tank in the loft.
  • Standard
    If you have a hot water storage cylinder as well as a cold water tank in the loft, your boiler is likely to be Standard. These are also called Regular, Traditional or Conventional boilers.
  • System
    If you have a hot water storage cylinder but no cold water tank in the loft, you're likely to have a System boiler. The boiler will normally have a pressure gauge on the front of it.
  • Back Boiler
    A back boiler unit (BBU) is a boiler built-in behind an electric or gas fireplace. You can also choose this option if you have a Potterton Powermax.

Hopefully, now you know which type of boiler you have, but if your still not sure watch this video from Worcester Bosch, where they explain the main features and benefits of each type of boiler.

The most popular type of boiler is a combi boiler as they tend to be more efficient, cheaper, supply hot water almost instantly and take up less space in your house. Although you may need to consider one of the other types of boiler if you have a large house with multiple showers running off the boiler.

How efficient is your boiler?

How efficient your existing boiler is, seriously affects the amount you pay on your energy bills. Upgrading your old gas boiler to a new A-rated gas boiler with a smart thermostat and radiator controls (TRVs) installed could save you hundreds of pounds a year off your energy bills.

Not sure how efficient your existing boiler is? Visit this helpful tool, please not, you'll need to know the make and model of your boiler beforehand.

To find a new A-rated boiler visit

What do I do next?

Once you have worked out the right type of boiler for your families needs, you will need to select a boiler brand and model.

There are lots to choose from but we recommend Worcester Bosch boilers, as we think they are not only the UK's most loved boiler brand, they've been independently recognised as the best in the business. They're top of the Which? gas boiler report and have been for the last 9 years. We install their Greenstar range of combi, conventional and system boilers. So no matter what type of boiler you need, you can be sure you're getting the best.

If you would like to replace your boiler or just get a genuine fixed price visit

Has your boiler stopped working and the weather is below freezing?

If the temperature outside has been below freezing and your boiler has stopped working, you may have a frozen condensate pipe. Don't panic you do not need to call an engineer. You can defrost the pipe yourself, just follow the instructions in the video below and you will have your hot water back on in no time at all.