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Local boilers & heating experts you can trust.

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Improved energy efficiency

A new boiler will be more efficient, this means it will cost you less to heat your home.

Peace of mind

Our boilers come with up to 12 years parts and labour guarantee, so you can relax and enjoy.

Spread the cost

Use our flexible payment options to spread the cost with little or no deposit.

A new Worcester Bosch boiler being delivered and installed by two Diamond Green Energy engineers
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How it works

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You answer

Answer a few quick questions to get an online estimate in seconds, including installation options and product details

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You pick

Our team will arrange a free, no obligation, home assessment at a time that suits you with one of our trained engineers to discuss which installation options will best suit you and your home.

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We install

Our experienced installation team will arrive at a date and time that suits you and will look after your installation from start to finish.

Why choose us?

Quality products

All of our boilers come with a manufacturer-backed guarantee and are Which? Best-Buy rated.

Honest pricing

We provide fast and accurate quotations with no hidden fees or costs.

Care packages

We offer flexible and scalable packages to suit your needs.

Friendly & professional

Our engineers are Gas Safe registered, they follow strict practice guidelines.


Our head office is in Fareham, we cover Portsmouth, Southampton, Bournemouth, Brighton on the south coast. We go north as far as Basingstoke and Farnborough.

We are an independent family owned and run company. Ian and Louise Simm are the company owners, their son and daughter both work for the company.

We employ our own engineers who will install your boiler, if an electrician is required for the installation he will also be our own employee.

We have been fitting boilers for a long time and know which ones are likely to cause you issues, so we’re always happy to advise. However it’s your home and we’ll fit the boiler you want.

Yes we have lots of options available. This includes interest free and no deposit options.

The best boiler type for your home depends on factors such as the size of your property, your heating and hot water needs, and your budget. Common options include combi boilers, system boilers, and regular boilers. We can help you determine the most suitable option during a consultation.

We offer heat pumps and boilers so we can give you honest advice of what will suit your home best. For the majority of uk homeowners, a gas boiler is still the best choice.

Ready? Use our quote tool to find the perfect solution for you.

Or, if you prefer to talk to a human feel free to call us on 0330 818 8529