What size boiler do I need?

Find the right size boiler for your home.

Moving into a new property? Or perhaps your home isn’t being efficiently heated? You may be asking yourself ‘what size boiler do I need?’ So, here’s our guide to choosing the right size to get your home feeling cosy.

How big a boiler do I need?

Firstly, you need to assess how much power you need your boiler to deliver. This is governed by the size of your home, how many radiators you have and how high the demand for heating and hot water is. The higher the demand, the bigger the boiler you'll need.

How to measure up for a boiler.

Depending on the size of your property, and how much energy you use, you’ll need to find the correct sized boiler to heat your home efficiently.

A boiler that is too small, for example, will work harder to heat a large space. This will equate to larger energy usage and bills.

The table below will give you an idea for which sized boiler you need in relation to the size of your property:

Number of bedrooms

Number of bathrooms

Number of radiators

Boiler output

2 bed




3 bed




4 bed




Source: Boiler Guide

The best thing to do is to speak with a Gas Safe registered engineer, or call us on 0800 731 3344.

You can also contact us online via our website. All of our engineers are Gas Safe registered, so you can be sure that the advice you receive is reliable and trustworthy.

1. Find a large cupboard or wall space.

Favourite boiler locations in the home include kitchens, lofts, storage cupboards, airing cupboards or utility rooms.

Before committing to an installation, ensure you’re happy with its placement as it is key to the boiler’s accessibility for servicing as well as the visual aesthetic.

2. Find the best boiler for you.

Now you’ve done your research, you can choose the best boiler to suit your needs and budget. Click here to get a boiler quote or to enquire about a new boiler. 

Why choose Swale Heating?

We were founded in 1972 to focus on top quality installation with follow-up maintenance to the same standard. Our Gas Safe registered engineers are experts in installing high quality boilers, with brands including Worcester Bosch, Vaillant and Baxi.

Swale Heating is now one of Kent's largest installers of boilers and heating systems, completing thousands of installations each year, and keeping homes safe and warm, via our maintenance and repair services.

We understand that the failure of your heating system can leave you feeling anxious, which is why we're available 24 hours a day, 365 days a year. You can find out more about our boiler cover plans and use our online portal to book your repair or annual service. If you would like a quote for a new boiler, click here.