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What to ask before you buy a boiler?

There is a lot of research required when searching for the best boiler. Our experts are here to break down the most popular boiler-related queries so you know what system would best fit your home.

What size boiler do I need?

Boiler size is a crucial part of the decision process, as you need to make sure you have the space to fit the system but check that the power (kw's) is correct for your home as if your boiler is too powerful, it can waste a lot of energy and be less efficient.

Combi boilers are best suited for smaller homes with one or two bathrooms, as they are smaller in size and take up less space.

System and regular boilers are better suited to larger homes and need to be installed with a hot water cylinder, which often sits in an airing cupboard, garage or loft space.

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How efficient are boilers?

Boiler efficiency is measured from ratings G (least efficient) to A++ (most efficient). Modern boilers are designed with advanced technology, resulting in increased efficiency and benefits for both the environment and your energy bills. When buying a boiler, you should look for one rated in one of the higher specs (A, A+, A++,) as they use less fuel, lowering your monthly energy bills.

Our Glow-worm regular boilers are ErP A rated, meaning they use less energy, which will help you save money when heating your home.

How much maintenance do boilers require?


Boiler services should take place annually to make sure that it is operating safely, in good condition, and continues to provide your home with constant hot water and heating.


Whereas boiler repairs are performed whenever there is a fault, usually handled by a heating. It is important to keep an eye on your boiler throughout the year and check for leaks, unusual noises, and any corrosion, to make sure everything is running smoothly.


Boiler pressure should be monitored every so often, so your home is performing at maximum performance. The value should be between 1.2 and 1.5.

You should bleed your radiators every year to ensure they are working effectively and reduce strain on your boiler. Signs to look out for are if you notice any cold spots on your radiator or any unusual noises. If the noises continue you may need it repaired by a professional.

Find out more about boiler servicing here.

Is there a guarantee?

✔ Glow-worm boilers have a guarantee scheme where our Club Energy installers are on hand to fix any defects occurring in the system.

Our guarantee covers can be found here

If the issues that occur are related to the manufacturing of the boiler, then the costs for parts and labour will be covered.

✘ However, the Glow-worm boiler guarantee does not cover issues that are unrelated to the manufacturing of the product.

Check out more about our boiler guarantee scheme.

Can boilers be used with smart home systems?

Yes! Our smart home systems are here to help monitor and put you in control of your heating 24/7 through a range of smart technology.

Our smart controls allow you to access your boiler's heating and hot water settings from anywhere so that you can maximise the efficiency of your boiler while increasing comfort and lowering your energy bills.

Also, our new MiGo Link internet gateway allows you to control your heating with voice command when connected to either an Amazon Alexa or Apple HomeKit.

Check out our smart controls home products.


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Glossary of Terms

View our commonly used terms here