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158 Google reviews
1–2 days
Typical install time
£7,500
BUS grant amount
Henman Dunn Limited is an MCS certified air source installer based in Derbyshire. They are registered with the Boiler Upgrade Scheme, meaning they can help you claim up to £7,500 towards your installation.
Based in Derbyshire, DE5 9QT
Areas served:
5.0
158 Google reviews
Based on verified Google reviews
Claire Cowlishaw
We had the pleasure of using Herman Dunn to install our new radiators . Ben and Sin arrived at our house at the time agreed. As I had to leave for work before they arrived my mother met them at home and said what lovely and polite men they both were. I was really impressed by the workmanship and professional attitude from Ben and Sin. I would highly recommend the company and will be definitely using them in the future.
Luanne Hunt
Henman Dunn came recommended to us and I’m so glad we used them. They moved our boiler, fitted an unvented cylinder and removed our existing cylinder and water tank. Ashleigh quoted and understood everything than we wanted to do. Everything happened so smoothly. Nothing was a problem. Michael and George worked flat out. So courteous and respectful. Cleaned up after themselves and took all the rubbish away. We have an old house with lots of work to do, so this is one less job to do. We will definitely use them again. Thank you.
Garry Hague
Received a recommendation for this company and very pleased that I did. Was lucky to get a quick appointment due to a cancellation. The engineer arrived right on time. He was polite and courteous and very efficient in the work he carried out. I will certainly use them again in the future and would definitely recommend them to others.
Kim Woodhall
Highly recommend Ash and his team at Henman Dunn from start to finish........ We had a full bathroom makeover. Ash, came out and planed the bathroom with us design it nothing was to much trouble for them, workmanship was outstanding, a big thank you to Tim & Adam arrived to start the job totally removed all bathroom fittings airing cupboard and wall was took out old water tank and system. Fitted new combi boiler and pipe work to get the system up and running again... New drencher and shower cubicle fitted plus new vanity unit and loo and sink... mermaid board fitted to walls ceiling done with pvc new spot lights in. Fitted mirror tower rail heater, And floor covering... Have to say how the old bathroom looked it was a totally amazing transformation... Just like to say Excellent service great guys and would highly recommend them .. Thank you again we love it... Steve & Kim Woodhall. AAAAA
Dean Yates
The engineer’s turned up on time, worked in a professional manner and cleaned up after the job was done. I would thoroughly recommend this company if you’re considering a boiler installation. Lastly we had a few queries that needing resolving. Julia in the office was very professional, reassuring and had the engineers out the next day. Nothing was too much trouble. The customer service was excellent. Thank you.
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We are MCS‑certified and registered with an approved consumer protection/competent person scheme, which is essential for quality assurance and to access grants like the Boiler Upgrade Scheme (BUS).
We carry out a detailed home assessment, including property type, insulation levels, existing heating system and available outdoor space, to confirm whether a heat pump is a good fit.
We design the system using a heat‑loss calculation for your home, then match the correct kW size and model (for example, air‑source vs ground‑source) so it runs efficiently and reliably.
Our fixed quote clearly lists the heat pump, cylinder, controls, labour, scaffolding (if needed), electrical work and any radiator or pipework upgrades, so you know exactly what you’re paying for.
Yes, as an MCS installer we can confirm your eligibility, apply for the BUS grant (worth up to £7,500) on your behalf and deduct it directly from your quote.
A typical air‑source heat pump installation takes around 2–5 days, and we’ll agree locations for the indoor and outdoor units, manage any planning considerations and keep you informed each day.
After the heat‑loss survey, we’ll advise if any radiators, pipework, electrics or hot‑water cylinder need upgrading so the system can run efficiently at lower flow temperatures.
Modern heat pumps are designed to be quiet and must meet UK noise regulations; we’ll position the unit to minimise any impact on you and your neighbours and comply with local planning rules.
You’ll get manufacturer warranties on the heat pump plus our workmanship guarantee, and we offer ongoing servicing and support to keep your system performing at its best.
We’ll estimate your likely annual running costs and potential savings based on your current fuel type, insulation level and tariffs, using real‑world performance data rather than lab figures.
Boiler Upgrade Scheme
Up to £7,500
off your heat pump installation
This installer handles the full BUS grant application — deducted directly from your quote. No upfront payment needed for the grant amount.
Scheme open until 2028 — limited funding available
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