Dreading the Cost of a New Boiler? Don't.
Professional boiler installations by Gas Safe registered, Baxi Approved engineers. From your first call to the final check — we handle everything.
A new boiler installation can make a real difference to your home. Modern A-rated boilers are built to run more efficiently, meaning lower energy bills, reliable heating, and hot water whenever you need it. With trusted brands like Baxi, Worcester Bosch, and Vaillant, a new boiler could save you hundreds each year on your gas bills.
Every installation is carried out by our Gas Safe registered engineers, so you can be confident your new boiler is fitted safely and to the highest standard. Not sure if you need an upgrade? We offer free home surveys across Derbyshire and Nottinghamshire, and provide a personalised quote tailored to you and your home's specific needs.
Book Free Survey
It's not always obvious when a boiler needs a replacement rather than a repair. If your boiler is over 10 years old, losing pressure, making unusual noises, or costing more to run each year, it could be time to consider an upgrade. But if it's a straightforward fix, our experienced engineers will tell you — we'll never recommend a boiler replacement if a repair makes more sense.
Not sure what you need? Take our free 60-second boiler health check to find out whether a repair, service, or replacement is likely your best option — or book a free home survey for a personalised recommendation.
Which Type Is Right For You?
Best for: Flats, 1–3 bed homes, single bathrooms
The most popular choice in UK homes. A combi boiler heats water on demand — no hot water tank or cylinder needed. Compact, efficient, and cost-effective to install.
Best for: 3–4 bed homes, families, multiple bathrooms
A system boiler works with a hot water cylinder to store heated water. That means you can run hot water to multiple taps and showers at once without losing pressure.
Best for: Older properties, homes with existing traditional systems
Also called regular or heat-only boilers. These use a hot water cylinder and a cold water tank, usually in the loft. Often the best option if your home already has this type of system.
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How Much Does a New Boiler Cost?
A new boiler is a big investment — but it doesn't have to be a big upfront cost. Most boiler installations range from £1,800 to £3,500 depending on the type of boiler, the complexity of the installation, and your property.
That's why we've partnered with Phoenix Financial Consultants to offer flexible finance on every boiler installation. You can buy now and pay later, or spread the cost at 0% APR — whatever works for your budget. All finance is subject to status and credit checks.
Nothing to pay for 6 months, then spread over 60 months at 10.9% APR
Spread the cost over 1 to 10 years with no interest to pay
Finance provided through Phoenix Financial Consultants. Subject to status.
How It Works
We visit your home, assess your needs, and provide an honest, fixed-price quote.
Our Gas Safe engineers install your new boiler — usually completed in just one day.
We register your warranty, walk you through everything, and we're here if you need us.
At KAS Energy, we're committed to delivering reliable, high-quality heating & plumbing services across Derbyshire & Nottinghamshire. Here's why homeowners choose us with confidence:
Quick, dependable service when you need it most—no long waits.
Gas Safe registered professionals with 20+ years hands-on expertise.
Spread the cost with flexible payment plans.
Trusted by 315+ local customers for reliability, professionalism, and results.
WHAT OUR CUSTOMERS SAY
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"The KAS representative physically attended to survey the house and old boiler, checking water flow rate etc before leaving a written quote at the end of the visit. The quote was very competitive compared to another local company and an online franchise. Kim speedily replied to a lot of my queries and provided other quotes on different boilers without pressuring me to make a speedy decision. This particular project required replacing two Combi boilers in the property. In fact the engineer who arrived on time, Alex, was so competent and knowledgeable about the boilers I had chosen that he fitted both boilers on the same day. The work was carried out to a neat high standard. On completion the house was left as clean and tidy as when Alex arrived. Would highly recommend this company."
"YOU WANT A BOILER Fitting KAS are the Number 1. KAS Energy Plumbing and Heating, Alfreton, Derbyshire yesterday installed a new Worcester Bosch wall boiler. They were on time, gave me and my wife full details of what we were looking for and measured up for installation. We were sent a full breakdown of the price and how long it would take. We had got other prices from other companies but they bettered that and gave us an extra 5 years free service cover and an extra 5 years cover on the Worcester Boiler. They turned up on time, carried out all the work leaving no mess. They are fully approved Gas Safe, plumbing and electrical. Brilliant 100%."
"Very professional service from KAS. Competent plumber fitted the boiler in a day and explained how to operate in an understandable language. He was very tidy and the price from KAS was very competitive. I would have no reservations about recommending this company."
"Really happy with the service received from KAS Energy, excellent communication and they were able to book me in quickly. Sam replaced my old boiler and was very efficient and professional. I would recommend KAS Energy to anyone and will be using again in the future."
"Sam was very polite and professional. The work was completed and Kimberley kept us up to date with appointment times, availability and documentation. The price was competitive. Overall we're really happy with the work and will be saving their number for the future."
"I can confirm that they have excellent Knowledge, Attitude & Skills (KAS). I am very happy and relieved to have a Combi boiler installed perfectly with good finish, replacing an old heater boiler and placing it where the old cylinder was."
"I've had a brilliant experience with Kas Energy Plumbing and Heating. My mums boiler had stopped working so I messaged them and I got an immediate response, they came out the same day and got the boiler working again. Work was done at a fair price. So refreshing to find a company that offer this level of customer service."
"We have used KAS Energy Plumbing and Heating on several occasions and have never been let down. They have installed Underfloor Heating, carried out Boiler Repairs and installed replacement radiators. The communication was always good and the end product first class. We wouldn't use anyone else."
"I had a new boiler installed last June by Sam, and I've just recently had the boiler serviced for the 1st time since installation, would recommend, great service provided!"
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Where We Work
Based in Alfreton, we cover a wide area across Derbyshire and Nottinghamshire.
We're local, which means fast response times and quick arrival when you need us. No long waits, no chasing — just reliable service from a team that's right on your doorstep.
Not sure if we cover your area?
Contact us to check!
Get In Touch
Ready to get started? Contact us for a free, no-obligation quote. We're here to help with all your plumbing and heating needs across Derbyshire & Nottinghamshire.
Phone
01773 424563Address
Genesis Centre, Office 15,
King St, Alfreton, DE55 7DQ
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