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Replacement Boilers

Compare Boiler Replacement Costs

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Smart Thermostat

Why Replace Your Boiler?

Buying a new boiler is something that many homeowners put off for a long time. That’s no great surprise because of the sheer amount of time, money, and hassle involved in putting in a new on. After all, you have a boiler already and while it might be a bit temperamental, it does the job most of the time and it only needs the occasional engineer visit to put it right when it goes wrong.

However, even though it may feel like you’re saving money now, you could be costing yourself a lot of money in the long run.

If you have to get a boiler engineer out every so often to fix it, it will not have been working at anywhere near its best for quite some time now. Given that a properly functioning boiler can save you up to £200 a year on your electricity bill, it could be that you’re making no savings at all by keeping the boiler you’ve got now going.

And let’s not forget the call-out charges. If your boiler’s magnetic filter breaks, it could cost £300 or more to replace it. Even replacing the timer can cost £90.

How Much Does My Old Boiler Cost to Run?

Think back over the last two years – how much have you actually spent on keeping your current boiler? If it’s more than £200, you’re throwing good money and, if you delay it for another couple of years, the total cost of maintaining and repairing your current boiler could total nearly as much as having a brand new one put in instead.

If one or more has been happening over the last two years more than you’d like, then it’s time to change:

Energy bills seem to be creeping up every three months.
Boiler makes some really loud, funny, rattling noises.
Radiators never get as warm as they used to get.
Boiler is switching itself off for no reason I know of too many times.
My thermostat doesn’t get the house or the hot water to the temperature I want it to.
My pilot light is always going out.
ver since I had a new conservatory/extension put on, my boiler’s never been the same.
Gold pipe from inside a boiler

How Much Can I Save on My Energy Bills with a New Boiler?

Your Existing Boiler

Mid-floor Apartment

Terraced House

Bungalow, Detached

Home, Detached

Home, Semi-detached

























On the left of the table above, you can see an energy efficiency rating. “G” is the very lowest rating any boiler can get for its energy efficiency rating. Did you know that many boilers that were state of the art ten years ago would perform badly in today’s tests? If your boiler is more than 15 years old, it almost certainly would fail a modern energy efficiency test completely.

The figures above are from the Energy Savings Trust. They show you the types of savings you can make every year on your heating bills by switching to a model A-rated boiler with thermostatic radiator controls, a modern programmer, and a room thermostat.

Let’s say that you live in a semi-detached house where your current boiler is F-rated. By switching to a new boiler, you’ll save up to £140 a year. If you replace your current combi boiler with a new one and no additional work is needed, it’ll cost you around £2,000. That means that your new boiler will pay for itself in 14 years.

What’s better? To spend £2,000 on a new boiler that will save you money or spend £2,000 over three to four years on a boiler that keeps breaking down and which doesn’t heat your home the way it used to?

What are The Main Types of Boilers?

There are three main types of boilers in the UK today, the most popular of which is the combination boiler. We’ll describe the differences between the boilers shortly but, below, you can see what it would cost, in most cases, to replace your existing boiler with a new one of the same type:

Boiler Type

Supply Only

In its Current Location

In a New Location

Conventional boiler




Sealed system boiler




Combination boiler




Boiler Types

Combination boilers

The Best Combi boilers provide heat on demand to deliver hot water to the taps and heat to the radiators. Compared with conventional and system boilers, they don’t require a separate water tank and, in terms of their overall footprint, they’re generally the smallest types of boiler on the market – great if your home is not the biggest.

Combi boilers are the most popular types of boiler in the UK but they struggle with power showers and providing hot water to more than one tap at any given time.

Conventional boilers

Sometimes called open vent boilers, heat-only boilers, regular, or traditional boilers, conventional boilers require space for a storage cylinder (for example, an airing cupboard or large utility room) and a water tank (generally located in a loft).

They take up far more room than combination boilers but, unlike combi boilers, they handle power showers well and they can distribute hot water at a high pressure to two or more taps at the same time.

Where they struggle is that, once the hot water has been used up, you’ll not have any more hot water until the storage cylinder is full again.

System boilers

System boilers are even bigger and require more space than conventional boilers however they’re really only suitable for really large premises with lots of taps that require hot water at the same time.

As with a conventional boiler, you have to wait for the storage cylinder to heat more water up if it has been emptied through heavily family usage.

What Size boiler Do I Need?

There are three main groupings of boiler according to size – 24-27kW, 28-34kW, and 35kW and above. Different types of property require different sized boilers and this table below will give you a good guide to the size you need for yours.

№ Bedrooms

№ Bathrooms

№ Radiators

Property Type

Boiler Size Recommendation

Boiler Type Recommendation

1 or 2



Small mid-terraced , Small bungalow, Apartment



3 or 4

1 or 2


Medium mid-terrace, Medium bungalow, Semi-detached house






Substantial semi-detached, Detached house


Combi or Conventional

The size of your boiler gives you an indication to how much hot water it can produce at any one time to provide to your radiators and your taps.

It’s important to get this right because if you or your installer choose a boiler which is too small, it will have ongoing problems providing you with the amount of water you need. You may suffer from real water pressure issues particularly if someone is running a bath and someone else is doing the washing up at the same time.

If you or your installer choose one which is too large, then hot water and heat will not be a problem. What will be negative for you and your family is that so much energy will be consumed keeping the boiler going that savings on your utility bills may be wiped out or you may end up paying more than you did before.

On most occasions, your installer will recommend that you do a straight swap to the same type of boiler in the same location as it is now. This will save you money and greatly reduce the time that installation takes. However, after speaking with you about how you use water, your installer may recommend a switch to a conventional boiler (or a system boiler if your home is particularly large).

What to do next?

You will be pleased to read that we have a vetted panel of reliable suppliers and installers of replacement boilers whom we can put you in touch with. They will be able to provide you with one or more free, no-obligation competitive quotes for your perusal.

When Should you Replace a Boiler and Why.

Did your boiler withstand the Beast from The East? Colder temperatures can often lead to boiler problems. When it is cold the boiler naturally becomes the most important technology in the home so it is very important to know that your boiler is working well.

Modern boilers are currently expected to last up to 15 years. More expensive boilers that are well looked after can last up to 20 years.

A new energy-efficient boiler can significantly reduce your energy bills, as shown by the Energy Saving Trust below. The not for profit energy group Ebico suggests that heating your home is likely to account for up to two-thirds of the total expenditure on energy in the home.

England and Scotland

Old Boiler Rating

Semi-detached House

Detached House

Mid terrace House

Mid Floor Flat

G (<70%)





F (70-74%)





E (74-78%)





D (78-82%)





Replacement Boilers

Things You Need to Consider Before Getting a Boiler Replacement:

To replace your existing boiler you need to know that you have the means to pay for it either in a lump sum or on a monthly boiler payment plan.

Which? magazine has rated different boiler brands, including leading boiler brands such as Worcester Bosch, Viessman, Baxi and Vaillant. They discovered that boiler prices range from £600 to £2,400. You then need to consider the boiler’s installation cost, which can range from £400 to £1,500 depending on the part of the country that you live and what you are having done.

8 Signs You Need a New Boiler

According to Plumbcare there are a number of tell signs to suggest that it may be time for a new boiler beyond the boiler age and knowing that you have the means to pay for the boiler.

The energy efficiency rating of the boiler is below ‘A’
The boiler flame burns yellow and not blue
You seem to be having to get your boiler repaired more often
The cost of maintaining the boiler are increasing
Your house isn’t as warm as it should be
Your fuel bills are increasing
Your boiler makes strange noises
Strange smells are coming from your boiler

If you are considering replacing your boiler, the Energy Savings Trust recommends getting three quotes from different installers and making sure that they are on the Gas Safe Register.

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