Kensa Heat Pump Review: The UK Ground Source Specialist
Kensa is Britain’s only dedicated ground-source heat pump maker. Its compact Shoebox is one of the most efficient heat pumps going, with the lowest running costs and no outdoor unit at all — but ground source means a high upfront cost and a garden.
The short verdict
Kensa makes some of the best heat pumps in Britain — but they’re ground source, which suits specific homes rather than every one. As the UK’s only dedicated ground source manufacturer (British-made in Cornwall for 25+ years), Kensa’s standout Shoebox NX is genuinely excellent: SCOP up to 5.39 (~500% efficient, A+++) — among the most efficient heat pumps on the market — with the lowest running costs of any heating system (£550–£850/year), a high 65°C flow that suits older radiators, and — uniquely — no outdoor unit at all (everything’s indoors, the array buried), making it silent and invisible.
The honest catches are inherent to ground source: a high upfront cost (£15,000–£28,000, or £7,500–£20,500 after the BUS grant), the need for land (a garden for loops or a borehole), and a relatively short 5-year warranty. But Kensa’s innovative shared ground loops can slash the cost for suitable developments. So Kensa is superb for conservation areas, noise-sensitive sites, homes with land, and lowest-running-cost seekers — less so if you’ve no garden or a tight upfront budget. Full review below. Our score: 4/5.
What this review covers
The UK’s ground source specialist
Kensa occupies a unique spot in the UK heat pump market: it’s the only dedicated ground source heat pump manufacturer in Britain, designing and building its units in Truro, Cornwall for over 25 years. That specialism matters. While the big names you’ll see in our best heat pumps guide (Vaillant, Mitsubishi, Samsung and the rest) focus overwhelmingly on air source heat pumps, Kensa has spent decades perfecting ground source — a fundamentally different (and in efficiency terms, superior) technology. Ground source heat pumps extract heat from the stable temperature of the earth via buried pipes or boreholes, rather than from the outdoor air. Because the ground stays at a steady temperature year-round — even in winter when you most need heat — ground source is inherently more efficient than air source, and Kensa’s British engineering has made it a genuine world leader. If you’re specifically interested in ground source, Kensa is the UK name.
The range: Shoebox, Evo & Duo
| Model | Best for | Notable |
|---|---|---|
| Shoebox NX | Flats, small homes, new builds | Fits a cupboard, SCOP 5.39 |
| Evo | Standard homes | Up to 32kW, stainless steel |
| Duo | Homes wanting all-in-one | Integrated hot water cylinder |
Kensa’s headline product is the award-winning Shoebox NX — a remarkably compact ground source heat pump that fits inside a standard kitchen or airing cupboard (just 595×595×410mm), yet delivers a SCOP of up to 5.39 and A+++ efficiency — one of the highest ratings on the market. It provides heating and hot water up to 65°C (near boiler temperature), can offer passive cooling in summer, and the unit itself starts from around £4,625–£6,495. The larger Evo handles up to 32kW for bigger properties, and the Duo integrates a hot water cylinder for an all-in-one solution. Newer models use eco-friendly R290 refrigerant. Across the range, the defining Kensa traits are compactness, class-leading efficiency, and British manufacturing.
Three things that make Kensa special
Kensa’s genuine advantages over a typical (air source) heat pump
1. No outdoor unit — silent and invisible. This is the big one. Unlike air source heat pumps (which have an outdoor fan unit), a Kensa system has no external equipment at all — the heat pump sits indoors and the ground array is buried in your garden. That means zero outdoor noise and nothing visible, which makes Kensa ideal for conservation areas, listed buildings, and anyone worried about heat pump noise near a bedroom or neighbour.
2. The lowest running costs of any heating system. Because ground temperature is stable year-round, Kensa’s SCOP of up to 5.39 (~500% efficient) delivers running costs of just £550–£850/year for a typical home — 15–30% more efficient than air source, and the cheapest heating you can get.
3. High 65°C flow — kinder to old radiators. Kensa reaches near-boiler flow temperatures, so it can heat existing radiators effectively — making it well-suited to older homes without a full radiator overhaul.
Cost & the innovative shared-loop option
Here’s the honest cost picture. A standard single-home Kensa ground source install costs £15,000–£28,000 including ground works — considerably more than an air source heat pump (£8,000–£11,000), because the ground array (horizontal loops in trenches, or a vertical borehole) is expensive to install. The £7,500 Boiler Upgrade Scheme grant applies to all Kensa installs, bringing the net cost to £7,500–£20,500 (0% VAT too). But Kensa has a genuinely clever answer to the cost problem: shared ground loops (via Kensa Utilities). Here, an external investor (a utility or local authority) owns and pays for the expensive ground array, and you only pay for your indoor unit plus a connection — bringing ground source down close to air source prices, and making it viable for flats, terraces and homes without much land. It’s a genuinely distinctive innovation no rival offers at scale. And remember: the very low running costs (£550–£850/year) offset the higher upfront cost over the system’s long life.
The honest downsides
The trade-offs of ground source — and Kensa’s short warranty
Kensa is superb, but ground source has inherent limitations, plus one Kensa-specific point:
1. High upfront cost. £15,000–£28,000 (£7,500–£20,500 after grant) — much more than air source, with a longer payback (the low running costs help, but the capex is real).
2. Needs land. Horizontal loops need ~200–400m² of garden; a borehole needs drilling-rig access. Not every property is suitable — small or gardenless homes are ruled out unless a shared loop is available.
3. Short warranty (the Kensa-specific one). Kensa offers only a 5-year warranty on the core unit — notably shorter than rivals’ 7, 10 or up to 15 years (though it gives lifetime technical support, and GSHPs are inherently long-lived). Worth clarifying directly.
4. Installation disruption. Digging trenches or drilling a borehole is more disruptive than an air source install, and fewer installers specialise in ground source.
None is a dealbreaker for the right property — but they mean Kensa suits specific situations, not every home.
Ground source (Kensa) vs air source
Since most heat pumps are air source, here’s the honest comparison. Ground source (Kensa) wins on: efficiency (15–30% higher), running costs (the lowest of any system), noise (silent, no outdoor unit), aesthetics (invisible — great for conservation areas), and lifespan (20–25 years for the pump, 50–100 for the ground array). Air source wins on: upfront cost (much cheaper, no ground works) and universality (fits almost any property, while ground source needs land). So it’s a genuine trade-off: Kensa is more efficient, cheaper to run, quieter and longer-lasting, but costs more upfront and needs a garden or borehole. If you have the land and want the best long-term system, ground source is superb; if budget or space is tight, an air source heat pump is the more practical choice. Kensa’s shared-loop option narrows the cost gap for suitable developments. Compare the field in our best heat pumps guide.
Who Kensa heat pumps are right for
✓ Great for
- Homes with a garden or borehole space
- Conservation areas / listed buildings (invisible)
- Noise-sensitive sites (silent, no outdoor unit)
- Lowest-running-cost seekers
- New builds & forever homes
- Shared-loop developments / flats
✗ Less ideal for
- Homes with no/small garden (unless shared loop)
- Tight upfront budgets (air source cheaper)
- Those wanting a long warranty
- Quick-payback seekers
- Properties unsuitable for ground works
In short: Kensa is outstanding for homes with land that want the most efficient, quietest, cheapest-to-run heating — especially in conservation areas or noise-sensitive spots where an air source outdoor unit would be a problem. If you have no garden or a tight upfront budget, an air source heat pump is the more practical route (unless a shared loop is available in your area).
Our verdict
Frequently asked questions
Are Kensa heat pumps any good?
Excellent — Kensa is the UK’s only dedicated ground source manufacturer (British-made, Cornwall, 25+ years). The Shoebox NX is among the most efficient heat pumps going (SCOP up to 5.39, ~500%), with the lowest running costs of any system (£550–£850/yr), 65°C flow for old radiators, and no outdoor unit at all. Trustpilot 4.8. The catches: high upfront cost and the need for land.
How much does a Kensa heat pump cost?
£15,000–£28,000 installed including ground works — more than air source because of the ground array. The £7,500 BUS grant brings it to £7,500–£20,500 (0% VAT too). Kensa’s shared ground loops (a utility owns the array, you pay for the indoor unit) can cut this close to air-source prices for suitable developments. Running costs are the lowest going (£550–£850/yr).
Kensa (ground source) vs air source — what’s the difference?
Ground source draws heat from the stable ground (buried pipes/borehole); air source from outdoor air. Kensa wins on efficiency (15–30% more), running cost (lowest of any system), noise (silent, no outdoor unit), aesthetics (invisible — great for conservation areas) and lifespan. Air source wins on upfront cost and fitting almost any property. Kensa needs land.
What are the downsides of Kensa heat pumps?
Three main ones: high upfront cost (£15,000–£28,000, or £7,500–£20,500 after grant); the need for land (~200–400m² garden for loops, or a borehole — not every property suits); and a short 5-year warranty on the core unit (vs rivals’ 7–15yr, though with lifetime tech support). Also more installation disruption. Superb for the right property, not universal.
Are Kensa heat pumps quiet?
Yes — the quietest option available, because there’s no outdoor unit at all. Everything is indoors (the unit runs at ~47–52dB, like a dishwasher) and the ground array is buried, so there’s zero external noise. That makes Kensa ideal where heat pump noise is a worry — near a bedroom or neighbour, or in a conservation area where an air-source outdoor unit would be a problem.
Do Kensa heat pumps qualify for the £7,500 grant?
Yes — all Kensa ground source installations are MCS-certified and eligible for the full £7,500 Boiler Upgrade Scheme grant (via an MCS installer), plus 0% VAT to March 2027. Because ground source costs more upfront, the grant covers a smaller proportion than on a cheaper air-source unit, but it still meaningfully reduces the cost — and shared-loop schemes can reduce it much further.
Superb, super-efficient & invisible — if you have the land
The bottom line: Kensa makes genuinely world-class ground source heat pumps — the Shoebox NX is among the most efficient heat pumps available, silent, invisible, British-made, and the cheapest heating to run. It’s held back only by the things inherent to ground source: high upfront cost and the need for land, plus a shorter 5-year warranty than rivals. For a home with a garden — especially in a conservation area or where noise matters — it’s outstanding. For homes without land or budget, air source is more practical. A superb 4/5 for the right property.
See if ground source suits your home →The verdict
Kensa is a genuine British success story and makes some of the finest heat pumps available anywhere — as the UK’s only dedicated ground source manufacturer, its Shoebox NX combines class-leading efficiency (SCOP 5.39), the lowest running costs of any heating system, near-boiler 65°C flow, and a silent, completely invisible installation (no outdoor unit). For the right home, it’s about as good as home heating gets, earning a strong 4/5.
The honest caveats are inherent to ground source, not failings of Kensa: the high upfront cost (£15,000–£28,000, or £7,500–£20,500 after the BUS grant) and the need for land (a garden or borehole) mean it isn’t right for every property, and the 5-year warranty is shorter than some rivals’. But if you have the space — and especially if you’re in a conservation area or somewhere an air source unit’s noise or appearance would be a problem — Kensa is outstanding, and its shared-loop innovation can make ground source far more affordable. Pair it with solar panels and you’d have about the greenest, cheapest-to-run home heating possible. The best way to know if it suits your home is an expert survey — a couple of free, no-obligation home surveys will confirm whether ground source works for your land and property, or whether an air source alternative is the smarter fit.
Important
Going Solar UK is an independent introduction service, not a heat pump manufacturer or installer. This review reflects our honest editorial opinion based on publicly available specifications, pricing and information for Kensa ground source heat pumps as of September 2026: models, specs, warranty terms, pricing and grant details change – always confirm current details, including warranty terms and property suitability, before buying. Ground source heat pumps require suitable land and ground conditions, which must be assessed for your specific property. Grant eligibility (Boiler Upgrade Scheme) and figures depend on your circumstances. Always get itemised quotes from MCS-certified installers before deciding. We have no commercial relationship with Kensa.
We may receive a commission when we introduce you to an installer, at no cost to you. Any contract for work is directly between you and the installer.