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.
Start your new quote here
How it works
Answer a few quick questions to get an online estimate in seconds, including installation options and product details
You pick the package that best suits your needs. Our team will confirm any products chosen are suitable for your home. If needed we will carry out a home survey by video call or in person
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?
All of our boilers come with a manufacturer-backed guarantee and are Which? Best-Buy rated.
We provide fast and accurate quotations with no hidden fees or costs.
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.
What our customers say
Everything went to plan
After getting a number of quotes for a new boiler, we chose Diamond Green Energy and I’m so pleased that we did.
Great installation and customer service
The team at Diamond have been great from start to finish. We’re so pleased with our air conditioning.
Really pleased with the end result
No pushy salesperson, just a genuine solar expert giving us all the facts and figures so that we could make an informed decision.
The cost savings are huge
The job was far from straightforward and Diamond exceeded our expectations with their technical knowledge.
Diamond were quick and professional
Diamond were quick and professional from the initial enquiry, right through to completing the install.
The service has been impeccable
I’ve been a WarmCare customer for nearly 8 years. The service has been impeccable.
Thanks all for great service
Diamond were great and only wanted us to get what we needed. Thanks all for great service.