Heat pump specialists · Nuneaton · since 2015
Hex Energy designs, installs and looks after ground, air and water source heat pump systems for homes, businesses and public buildings. Certified GeoExchange design, groundworks and servicing, all from one in-house team.
Who we work with
Homes
Retrofits, new builds, barn conversions and listed homes. We size the heat pump and the heating system together, so your home stays warm at low running costs.
Business & public sector
Feasibility, thermal response testing, design, installation and maintenance of commercial heat pump systems, working as contractor or principal contractor.
Why Hex
A heat pump is only as good as the system around it. Undersized ground loops, high flow temperatures and guesswork radiators are why some installations disappoint. We design the whole system in-house, then install exactly what we designed.
Founder Andy Howley is certified by the International Ground Source Heat Pump Association and the Association of Energy Engineers. He was a founding member of the UK’s Ground Source Heat Pump Association and wrote its Vertical Borehole Standards in 2011.
Drilling and trenching are part of every ground source package. We supervise all drilling so boreholes go in exactly as designed, and cut narrow, clean trenches with our own trenching machine.
Room-by-room heat-loss calculations, and underfloor heating designed with the heat pump rather than around it. Our Derbyshire new build runs its underfloor heating at a 35°C flow temperature.
Our repairs and maintenance team services what we install and looks after other installers’ heat pumps too, with engineers trained across multiple manufacturers.
Heat source finder
Answer three quick questions for a starting point. Your survey confirms it with a full heat-loss calculation.
Prices are Hex Energy ballparks for a new three-bed detached house. Your quote depends on the size of the property and how well it is insulated.
How it works
Every system is designed as a whole: the heat source, heat pump, cylinder, emitters, ventilation and controls. Pick a heat source, then explore each part.
Collector pipes laid in narrow trenches around 1.2 m deep, where the ground holds a steady temperature all year. We cut them with our own trenching machine and reinstate the ground afterwards.
Rule of thumb: around four times the building’s footprint for a new build.
Selected projects
Two MasterTherm heat pumps, 1,200 m² of collector loops laid by trenching machine to protect historic ridge-and-furrow fields, and an 800-litre cylinder. Heating bills fell by around 50% compared with oil, with no visible change to the house.
A mono-bore open-loop system for a luxury fashion group’s offices, presented by Andy Howley at the IGSHPA symposium in 2016. Still maintained by Hex, with virtually zero thermal breakthrough.
A bespoke system heating concrete mould beds and batch water: 36 ground loops under a landscaping bund, four MasterTherm units and a heat recovery unit lifting a 15,000-litre tank to 65°C overnight.
Two 110 m boreholes, screeded underfloor heating designed for a 35°C flow temperature and a 10.8 kW in-roof solar array that sits flush with the slate.
Seven end-of-life heat pumps swapped for ten inverter-driven, reversible MasterTherm units, with new weather-compensated controls that bring the existing boilers and chiller in only when needed.
Fifteen 100 m ground loops under the new driving range heat and cool the club house. The array runs warmer than designed, which lifts efficiency further.
Six 115 m trenches cut with our own trenching machine bring ground source heat to a barn conversion that had no heating system at all.
Outdoor units on concrete pads, with cylinders and buffers neatly in the loft. Payback is projected within eight years.
A closed loop laid in the lake turned a body of water into the heat source, replacing an LPG boiler.
Just completed
Seven MasterTherm AQ45iP R290 ground source heat pumps now supply low-temperature hot water and passive cooling to a new school building, supplied and installed by Hex under the CF21 framework.
Reviews
Their tender was both competitive and thorough … We are very happy with the installation, which is expected to reduce the carbon footprint of the building by around 60% and save 40% on our energy bills.
Braunstone Town CouncilAir source heat pump, community centre
From design to completion I found them both knowledgeable & professional. The quality of their work is excellent.
Gary HarperBespoke ground source system
The engineers are excellent. They are courteous, knowledgeable and really good at what they do.
Steve NaylorHeat pump, underfloor heating and servicing
We’ve had their underfloor system throughout our house for at least 6 years now and cannot complain about the effectiveness.
Joshua McLeanHeat pump and underfloor heating
Communication is always clear and professional, and they’re organised, responsive, and easy to collaborate with.
Rob PalmerSupplier to Hex Energy
How a project runs
A site visit and room-by-room heat-loss calculation. For commercial sites, a feasibility study and thermal response test.
Heat pump selection, ground array or source design, emitters, hydraulics and controls, drawn in CAD and Revit where needed.
Our own team handles groundworks, supervised drilling, plant and pipework. We can act as principal contractor.
Tested, commissioned and explained, with a user guide. As an MCS installer we apply for your Boiler Upgrade Scheme grant.
Servicing, water-quality testing and repairs from our in-house team, backed by 7 to 10 year warranties.
Grants and savings
We handle the paperwork. You get the savings.
£7,500
Boiler Upgrade Scheme grant towards an air, ground or water source heat pump in England and Wales when you replace fossil-fuel heating. Smaller commercial buildings can qualify too.
+£1,500
Extra until March 2027 if your property is heated by oil or LPG and has no mains gas connection: up to £9,000 in total.
0% VAT
On heat pumps, solar panels and battery storage installed in homes, until 31 March 2027.
Grant rules from GOV.UK, checked October 2026. Self-builds can qualify; most developer-built new homes cannot. We confirm your eligibility at survey.
About Hex Energy
Andy Howley has designed ground source systems since the 1990s. He founded Hex Energy in 2015 to close the gap between good design and the quality of installation homeowners actually received.
With design engineers, a domestic services team, commercial project management, and a dedicated repairs and maintenance team, all in-house in Nuneaton.
It depends on the size of the property and how well it is insulated. As a ballpark for a new three-bed detached house:
All before the £7,500 Boiler Upgrade Scheme grant. You get a fixed quote after your survey.
A horizontal ground loop generally needs around four times the footprint of a new-build house. Vertical boreholes need very little space: each one sits around 8 m from the next.
Yes, as long as the whole system is designed properly. That means sizing the heat pump and the radiators or underfloor heating together. Designed and installed correctly, you get a warm home and as much hot water as you need.
In England and Wales the Boiler Upgrade Scheme gives £7,500 towards an air, ground or water source heat pump when you replace fossil-fuel heating, plus £1,500 more until March 2027 if your property is heated by oil or LPG and has no mains gas. Heat pumps, solar panels and batteries for homes are also zero-rated for VAT until 31 March 2027.
As an MCS certified installer we apply for the grant for you once your system is commissioned. For a retrofit you’ll need an EPC.
That depends on what you pay for electricity. A well-installed ground source heat pump gives 4 to 5 kW of heat for every kW of electricity; air source gives 2.5 to 3.5 kW. Your MCS quote includes estimated running costs compared with your current fuel.
Yes. We provide feasibility studies, thermal response testing, design with in-house CAD and Revit, installation as contractor or principal contractor (we’re Constructionline Gold), and planned and reactive maintenance.
Yes. Our repairs and maintenance engineers are trained across multiple heat pump manufacturers and look after ground arrays as well as heat pumps. Tell us the make and model when you get in touch.
We’re based in Nuneaton, Warwickshire, and work across the Midlands and beyond, with projects in the Cotswolds, Oxfordshire, Derbyshire, Staffordshire and Central London.
Get started
A few details now saves time at your survey. We’ll come back to you to arrange the next step.
