Quick answer: For most Scottish homes, a heat pump costs more to install than a gas boiler but can match or beat it on running costs once the system is designed properly — and after the Home Energy Scotland grant, the upfront gap narrows dramatically. The right choice depends on your home’s heat loss, your radiators and how soon you need heat.
Almost everyone who calls us is really asking one thing underneath all the others: am I going to be worse off than I am with my gas boiler? Below is the honest comparison we’d give you at your kitchen table — including the numbers.
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Heat Pump vs Gas Boiler: Quick Comparison Table
| Factor | Gas Boiler | Air Source Heat Pump |
|---|---|---|
| Efficiency | ~90% | 300–400% (SCOP 3–4) |
| Typical install cost (Scotland) | £2,000–£3,500 | £8,000–£14,000 before grant |
| Home Energy Scotland grant | Not eligible | Up to £7,500 grant |
| Effective cost after grant | £2,000–£3,500 | £500–£6,500 |
| Typical lifespan | 10–15 years | 15–20+ years |
| Annual servicing | Recommended | Recommended (lighter) |
| Carbon footprint | High (fossil fuel) | Low, falling as grid greens |
Figures are indicative for Scottish homes and vary by property. Confirm current grant levels and quotes before publishing.
How Does a Heat Pump Differ From a Gas Boiler?
A gas boiler makes heat by burning fuel; a heat pump moves existing heat instead. That single difference drives every cost argument that follows.
A boiler combusts gas and loses a little up the flue — around 90% efficient on a good day. A heat pump pulls warmth out of the outside air, even in the cold, and concentrates it indoors. Because it shifts heat rather than creating it, it delivers three to four units of heat for every unit of electricity it draws — 300–400% efficiency. Nothing else in your home comes close.
How Much Does a Heat Pump Cost vs a Gas Boiler in Scotland?
A straight boiler swap in Scotland typically runs £2,000–£3,500, while a heat pump install is higher upfront — but the Home Energy Scotland grant changes the maths completely.
| Cost element | Gas boiler | Heat pump (before grant) | Heat pump (after grant) |
|---|---|---|---|
| Equipment + installation | £2,000–£3,500 | £8,000–£14,000 | £8,000–£14,000 |
| Home Energy Scotland grant | £0 | — | −£7,500 |
| Optional interest-free loan | N/A | Available | Available |
| Net cost to you | £2,000–£3,500 | £8,000–£14,000 | £500–£6,500 |
The raw sticker price is the wrong number to compare. Scotland has its own funding England and Wales don’t share in the same shape: through Home Energy Scotland, eligible homeowners get a substantial grant toward an air source heat pump, plus an optional interest-free loan. That comes off the real installed cost — and for many households we survey, it changes the decision entirely.
This is what generic UK price articles miss. They’re written for a homeowner in Birmingham who can’t touch your Scottish funding. Your maths is different because you live here.
Which Is Cheaper to Run, a Heat Pump or a Gas Boiler?
It depends on system design — a well-designed heat pump in an insulated home can undercut a gas boiler, but a poorly sized one can disappoint.
Gas is cheaper per unit than electricity. Compared unit-for-unit, the boiler wins. But you don’t buy heat by the unit of fuel — you buy the heat itself, and the heat pump gets three to four times more from each unit it uses. So the real sum isn’t “electricity costs more than gas,” it’s “electricity costs more per unit, but I need far fewer units.”
Three things decide whether the heat pump comes out ahead, and we check all of them at survey:
- How well your home holds heat — insulation and draughts
- The flow temperature the system is designed to run at — lower is cheaper
- How you actually live in the space — patterns of use
A heat pump rewards a home that’s been thought about and punishes one that hasn’t. The technology isn’t the variable — the design is.
Do Heat Pumps Work in Older Scottish Homes?
Yes — older stone and solid-wall homes heat beautifully on a heat pump when the system is designed correctly. The claim that they “don’t work” in period properties is out of date.
We install across Edinburgh and central Scotland, much of it older, solid-walled, stone-built stock — tenements, Victorian terraces, cottages older than the cavity wall. These homes need more care at the design stage: get the heat-loss calculation right, size the emitters properly, and choose a unit that holds output when temperatures drop. The homes that struggle are the ones where someone bolted a heat pump on without doing the homework — design, not the machine.
Heat Pump vs Gas Boiler: Lifespan and Maintenance
A heat pump typically lasts 15–20+ years versus 10–15 for a gas boiler, with fewer things to go wrong because there’s no combustion.
| Gas boiler | Heat pump | |
|---|---|---|
| Expected lifespan | 10–15 years | 15–20+ years |
| Servicing | Annual | Annual, lighter |
| Combustion parts | Yes (flame, flue) | None |
| Future-proofing | Fossil fuel, declining | Gets greener with the grid |
You’re trading a familiar short cycle for a less familiar long one — plus a system that gets more sensible over time as the grid decarbonises.
Should I Get a Heat Pump or a Gas Boiler?
Get a like-for-like boiler if yours has just died and you need heat tomorrow. Choose a heat pump if you’re planning ahead, want lower-carbon heating, and want to use Scottish funding while it’s here — provided it’s designed properly for your home.
That last clause is the whole game, and it’s exactly what a survey is for. We measure heat loss room by room, check your radiators and cylinder, and give you real numbers for your actual property instead of a national average.
Book a free heat pump survey with our Edinburgh-based team and we’ll do the sums properly, for your home, with the Scottish funding factored in from the start.
