Carmarthenshire - Retrofit
Ffos y Broga retrofit
Oil heating was replaced by an 18kW air source heat pump paired with solar PV at this pre-1850 home, retaining its radiator system.
Read their story
For homeowners
Heat pumps for a warmer home in Wales and the South West.
A carefully designed heat pump can keep your home comfortable and may lower heating bills. The result depends on your home, the fuel you replace, your electricity tariff and how the system is used. Our family-run team, based at Capel Hendre near Ammanford, can guide you through design, installation and available grants.
No EPC? Send an enquiry or call 01269 833100. We can check the evidence needed for your property.
20+ years operating
4,000+ systems installed
MCS certified
Certified and accredited
How your home will feel
More than heating. A feeling.
A heat pump doesn't blast and stop like a boiler. It keeps your whole home at a steady, gentle warmth — the kind you stop noticing, in the best way.
Even, gentle warmth
No more cold corners or chasing the thermostat. Just steady comfort, all day.
Sound considered from the start
Air source heat pumps have a fan and are not silent. We assess the equipment and its position to manage sound.
Everything a boiler isn't.
Your old boiler
- Burns oil, LPG or gas, with running costs affected by fuel prices
- Blasts hot, then cold — uneven rooms
- A flame in your home, serviced yearly
- No equivalent heat-pump grant support
A Thermal Earth heat pump
- Designed to use ambient heat efficiently
- Steady, gentle warmth in every room
- No combustion in the heat pump; annual servicing still matters
- Grant support for eligible homes
The Boiler Upgrade Scheme
Grant support, made simpler.
Grant values and eligibility depend on your property and system. We can check the current Boiler Upgrade Scheme rules and guide the application for eligible homes.
Eligible residential heat-pump installations are zero-rated for VAT until 31 March 2027. Welsh homeowners can also explore Green Homes Wales advice and interest-free finance, subject to its eligibility and application process.
We check eligibility
We guide the paperwork
Applied to eligible quotes
Up to £9,000
£7,500 for eligible air-to-water or ground-source installations. £9,000 when replacing oil or LPG at a property with no mains gas connection, for applications properly made from 21 July 2026 to 31 March 2027. We check eligibility and handle the paperwork.
Get a free estimate
Planning your budget
Typical heat-pump installation costs.
Typical UK ranges before the grant, as of October 2026. These published figures are a guide, not a Thermal Earth quote. Your home's heat demand, radiator and hot-water work, access and ground conditions affect the price.
| System | Before the grant | After a £7,500 BUS grant, if eligible |
|---|---|---|
| Air source (air-to-water) | £8,000–£16,500 | £500–£9,000 |
| Ground source (collector types combined) | About £19,000–£38,000 | About £11,500–£30,500 |
Sources: Nesta's published air source range and Which?'s 2026 ground source guide, reporting BUS installations from October 2022 to December 2025, rounded here. They do not cover every installation or provide separate ranges for each ground collector.
Horizontal collector or borehole? The Energy Saving Trust gives around £15,000 as a typical trench-based installation cost. Boreholes generally cost more; its heat-pump guide says the cost can reach around £57,000 where drilling is needed. A ground source project can therefore sit outside the combined range above.
Replacing oil or LPG? Eligible homes with no mains gas connection can receive £9,000 rather than £7,500 for applications properly made by 31 March 2027. For example, a £12,000 installation would leave £4,500 after the standard grant or £3,000 after the uplifted grant. We confirm the applicable grant and show it on your quote. Check the grant rules.
Use the estimator for a figure based on your home; a survey and agreed specification are needed for a firm quote. No EPC? Send an enquiry or call 01269 833100.
How it works
From first question to switch-on.
Start with a conversation, then a survey and a written design. We agree the programme for your home before work starts.
A friendly chat
Tell us about your home. We'll talk through options and rough costs — no pressure, no jargon.
Free home survey
Allow 1–2 hours; there's no charge. We assess insulation, radiator sizes, hot-water demand, space for equipment, garden access and ground conditions where relevant. Bring your questions and recent energy bills so we can discuss how you use your heating.
Design and proposal
Allow 1–2 weeks for the design stage. We calculate heat loss, size the system and set out the proposed equipment, work and estimated running costs. We also check grant eligibility.
Installation and switch-on
Allow 3–7 days for the internal installation. We connect the equipment and pipework, test and commission the system, then explain the controls and leave the handover documents.
For ground source, allow a separate 1–5 days for drilling or laying horizontal collectors. These are planning indications, not a fixed completion promise: ground conditions, access, permissions and the agreed scope can change the programme.
The Thermal Earth difference
One team, start to finish.
Thermal Earth coordinates design, drilling and installation so one accountable team guides the project from survey to aftercare.
How heat pumps work · Air source · Ground source · Grants · Finance · Servicing · Summer cooling · Areas we cover
Prefer to read in Welsh? Cymraeg.
- MCS-qualified design and installation
Specialists coordinate the system design and installation around your home.
- In-house drilling teams
For ground source, we own and operate our own drilling rigs.
- Designed around your home
A proper heat-loss survey means a system that's comfortable and efficient.
- Aftercare that lasts
Ongoing servicing and support are available for the life of your system if you choose to continue with Thermal Earth.
Heat pumps in real homes, at different scales.
Carmarthenshire - ASHP
Ariston Nimbus Pocket
An Ariston Nimbus Pocket 120M replaced an older air source heat pump, with a new hot-water cylinder and wireless thermostat.
Read their story
Cheshire manor - Project
Soughton House
Two MasterTherm AquaMaster AQ60i ground source heat pumps replaced oil and LPG heating at this large manor, serving the home and its swimming pool.
Read their storyThe things homeowners ask us.
Yes, when the equipment and radiators or underfloor heating are sized for your home's winter heat loss. Air source units can need defrost cycles and their efficiency changes with outdoor temperature. We design for local winter conditions and explain how the selected system meets demand.
Running costs depend on heat demand, the fuel and efficiency of your existing heating, electricity tariffs, flow temperature and how you use the controls. Savings are not automatic, particularly against an efficient gas or oil boiler. We explain the assumptions behind your estimated running costs before you decide.
Grant values and eligibility can change. We check the current Boiler Upgrade Scheme rules for your property and explain the support available before you proceed. Read about grants or see the typical cost guide.
Allow 3–7 days for the internal installation, with separate groundworks for ground source. Expect access for pipework, equipment and any radiator changes; trenches or drilling also disturb the garden. Heating and hot water may be interrupted while the old system is disconnected and the new one connected. We agree access, the work sequence, interruptions and any making-good work with you beforehand.
An annual service helps check performance and maintain the records needed for manufacturer warranty requirements. Follow the care instructions for your model and keep an air source unit clear of leaves and other obstructions. Ongoing service and maintenance contracts are available if you choose to continue with Thermal Earth. Explore servicing.
Underfloor heating works well with lower water temperatures, but it is not essential. Suitably sized radiators can work too. We check each room's heat loss and the output of your existing radiators at the proposed flow temperature; some may stay and others may need to be larger. Explore underfloor heating.
Yes, an older home can be suitable. Age alone does not decide it: insulation, draughts, room heat loss and the heating system matter. We assess these at survey and explain any improvements or radiator changes needed. Listed buildings and conservation areas may need additional permissions.
An air source unit has a fan and compressor, so it is not silent. Sound varies by model, operating conditions and position. We assess the location, nearby windows and neighbours as part of the design, including the sound and planning requirements that apply to your property.
We check the installation, test operation and set the controls for the agreed design. We show you how to use heating and hot water, explain routine care and leave the commissioning and system documents. Keep these with your warranty and service records.
Our installation work carries a 2-year workmanship guarantee. Equipment is covered by its manufacturer's warranty; the length and conditions, which can include annual servicing, depend on the model. We set out the equipment warranty and your deposit protection in writing with your quote. Keep the handover documents and service records, and contact us if you need help with a fault or a warranty enquiry.
Visit our showroom
See a heat pump system. Talk through your plans.
Book a demonstration appointment at our showroom in Capel Hendre, near Ammanford. Meet the team and ask the questions that matter for your home or project.
Find us
Ammanford
SA18 3SJ
Thermal Earth showroom
Unit 1B Capel Hendre Industrial EstateAmmanford
SA18 3SJ
Choose your visit date and time through our online booking page.
Ready to explore a warmer home with lower bills?
Tell us a little about your home for a free estimate and guidance on the grant support currently available.
The estimator takes a few minutes and helps us understand your home before we explain the next steps.
Prefer to chat? Call us on 01269 833100.