The Best 40kW Combi Boilers for Powerful and Efficient Heating

April 14, 2023 | News

Best 40kw boiler to install

The Best 40kW Combi Boilers for Powerful and Efficient Heating

Are you in the market for a powerful and efficient combi boiler? Look no further than the best 40kW options available on the market today. In this guide, we’ll provide you with everything you need to know about 40kW combi boilers, including how they work, if they are the right choice for your home, how much they cost, and which are the best options to consider.

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Which is the Best 40kW Combi Boiler?

When it comes to choosing the best 40kW combi boiler for your home, there are several great options to consider. We have done extensive research and identified the top choices based on their reliability, efficiency, performance, and user reviews. Here are our top picks:

  1. Worcester Bosch Greenstar 8000 Life 40
  2. Baxi 800 Platinum Plus
  3. Ideal Vogue Max
  4. ATAG i40C

Each of these boilers has its own unique features and benefits, so it is important to do your own research to determine which one will best meet your specific needs.

How Does a Combi Boiler Work?

Combi boilers, also known as combination boilers, are a popular choice for many homeowners because they provide instant heating and hot water on demand. Unlike traditional boilers, which store hot water in a cylinder, combi boilers heat water directly from the mains supply and send it directly to the tap or shower.

This means that you can enjoy hot water whenever you need it, without having to wait for a cylinder to heat up. However, it is important to note that combi boilers may struggle to meet high hot water demand if multiple outlets are being used simultaneously.

Is a 40kW Boiler a Good Choice?

A 40kW combi boiler is a great choice for larger homes with multiple bathrooms, as it is capable of producing 40 kilowatts of domestic hot water heating output. However, it is important to choose the right output rating for your specific needs, as a boiler that is too powerful will lead to higher heating bills, while one that is not powerful enough may not be able to meet your hot water needs.

Combi Boilers Up to 40 kW

All of the top 40kW combi boilers from major manufacturers are capable of heating 15-20 radiators while maintaining a high-efficiency energy rating. However, it is important to note that the central heating output of any combi boiler is not as high as 40kW. If you have a larger home with multiple bathrooms, a system boiler may be a better choice.

How Much Do 40kW Combi Boilers Cost?

Combi boilers are generally the most economical boiler type, as they do not require external tanks or cylinders. A natural gas 40kW combi boiler can cost less than £2,300 before installation costs, with full installation prices averaging around £3,500. However, prices can vary depending on the boiler type, complexity, and location, so it is important to compare multiple quotes to get the best deal.


In conclusion, if you are looking for a powerful and efficient combi boiler, then a 40kW combi boiler could be the perfect solution for your home. It eliminates the need for a traditional cylinder, saves space, and provides hot water as needed. With all the top boiler manufacturers making powerful 40 kW combi-boilers, you have plenty of choices. The Worcester Bosch Greenstar 8000 Life, Baxi 800 Platinum Plus, Ideal Vogue Max, and ATAG i40C are some of the best 40kw combi boilers available in the UK.

When choosing a 40kW combi boiler, it’s important to consider your hot water demand and choose an output rating that meets your needs. A 40 kW combi boiler can supply hot water for homes with two bathrooms, but it’s important to note that you may experience a drop in pressure if you use two showers at once.

We hope this guide has been helpful in choosing the best 40kW combi boiler for your home. Remember to get a fixed price quote from a Gas Safe registered engineer and compare multiple quotes to get the best deal. Don’t forget to consider the long-term savings on your energy bills when choosing a new boiler. With the right choice, you can enjoy powerful, efficient, and reliable hot water for years to come.


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