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How much does a boiler cost?

Installing a new boiler radiator on orange wall

New boiler cost, September 2020

If you are looking to buy and install a new boiler, then chances are yours has failed or is coming towards the end of its life. Most good quality boilers come with warranties of between five and ten years. But it is best to ask about your own boiler’s projected lifespan when you have it serviced. You also need to weigh up the cost of repairs versus replacing your current model if you are having problems with your heating and water.

The thing you will first notice when you look at the cost of replacing a boiler is that there really is no cheap option. But there are a huge variety of factors to consider when thinking about costs and how to reduce them. Do you consider replacing your back boiler/system boiler, hot water tank and immersion with a compact combi boiler? Do you buy an electric boiler for its energy efficiency? Or do you simply focus on deciding between a Worcester Bosch and a Vaillant?

Our guide to buying, moving or replacing a boiler aims to guide you in the right direction. We have set out the pricing basics you will need to know in a table below, too.

Searching our site for a Gas Safe boiler installer near you will give you access to our vetted experts. They can help you decided and give you a quote for the costs of buying, fitting and maintaining a new boiler.

Why does it cost so much to buy and install a boiler?

Boiler itemLow range Upper range
Boiler purchase only (no labour) £500£2,500
Boiler installation plus labour ( + VAT )£2,000£4,000
Biomass boiler£6,000-
MagnaClean use potential savings on bills£200£350
Wifi-enabled heating controller£200

Buying a new boiler is quite an investment for most people and represents a purchase that will probably outlast your latest car or computer. You want to get it right. Just the boiler itself can cost between £500 and £2,500 without the cost of labour. So your installer may not be making much at all on the cost itself. Their profit is usually tied up in the labour costs and any extra services. Depending on the size of the house and the placement of the boiler, its installation may take two tradespeople between one and two days.

Nest thermostat installation with new boiler

What is my budget for a new boiler?

To buy a new boiler and have it installed costs anything from £2,000 to £4,000 labour included but add VAT. You want to buy something that you can afford, but don’t scrimp on cost if you don’t have to. More expensive boilers are not always the best, but price is often an indication of build quality, longevity and efficiency.

It’s a choice between Vaillant, Baxi and Worcester Bosch, isn’t it?

Most plumbers and heating engineers will have their favourite brands, with Vaillant being seen as the mid-range go-to for many in the trade. Worcester Bosch is another favourite, although tends to be a little pricier in set-up costs and parts. Baxi and Ideal boilers are other names you may see, although the Viessmann brand is gaining popularity and good reviews of late. The better-known the boiler brand, the easier it will be to find parts should something go wrong. You may wish to research brands or consult one of our vetted expert tradespeople in your area.

Do I stick with a gas boiler or change to an electric boiler installation?

When it comes to boilers, most of us think of a gas combi-boiler. This provides hot water on demand, powers your central heating system and usually lives in a kitchen or bedroom cupboard. Electric boilers are becoming more popular, as they are seen as more environment-friendly and can be more fuel-efficient. These provide heat and water in much the same way and usually need less maintenance (especially as they don’t have the potential to leak carbon monoxide). Electric boilers work best in small-to-medium homes. But do remember that electricity does tend to cost more than gas and that fuel prices can vary. Biomass boilers are also favoured by some looking to be greener, but these are a large investment cost-wise at over £6,000. Talk to one of our vetted central heating engineers in your area to discuss which boiler type is best for you.

What size boiler do I need?

Your boiler installer will be able to advise on boiler size, which also impacts price. If you have a 1-bedroom flat, you will need a smaller gas boiler than if you live in a 3-bedroom house. Generally speaking, you will need a 24kw to 30kw boiler in anything up to a 3-bed home. Larger homes will need something over 35kw, due to the number of radiators. If you are installing an electric boiler then you will 9kw to 12kw for the average home. The simplest way to calculate the size of electric boiler to install is to times the number of radiators you have by 1.5 to give you the number of kw you need. Consult your boiler installer as to the correct size of electric of gas boiler, as buying an overly-powerful boiler leads to wasted energy and unnecessary cost.

What other costs are there when buying and new boiler?

The main extra costs of installing your new boiler includes factors such as moving the boiler moved to a new location or changing fuel types. Obviously, it is simpler to replace your boiler where it is, with the existing pipe work rather than relocating it.

Find a local boiler expert

There are other costs associated with having a new boiler installed that can save you money in the long-run and these include a powerflush of your heating system, as well as installation of magnetic filtering systems like MagnaClean, which can improve heat efficiency and reduce bills at between £200 and £350. Thermostats are another cost, with many now choosing to upgrade to a wifi-enabled heating controller such as Nest, Honeywell or Hive. This can add around £200 to the bill.  Of course, thinking about loft installation or draught-proofing is also essential if you wish to cut down on bills in the long-term.

Key boiler cost guide takeaways

  • Think about your budget before you think about which boiler to buy
  • Remember that a boiler is an investment that will last and should help cut bills
  • Consider whether gas or electric is best for you
  • Get your central heating engineer to recommend the right size boiler for your home
  • Consider new technology such as wifi-enabled thermostats

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