Heat pump vs LPG boiler in 2026: is the switch worth it?

The LPG-specific economics

LPG sits in an awkward middle ground between mains gas and heating oil. The fuel itself is more expensive per useful kWh than either (typically 8–11p per kWh in 2026 vs ~3–5p for mains gas and 7–10p for oil), and the supply chain involves more handling — regional bulk depots, road tankers, regular rotation visits — than either alternative. The Competition and Markets Authority has reviewed the domestic LPG market twice (2008, 2018) for exactly these competitive dynamics.

That all means the running-cost case for switching to a heat pump is sharper for LPG-heated homes than for mains-gas or oil-heated ones. The £7,500 BUS grant applies equally regardless of current fuel, so the day-one numbers also favour the switch.

Upfront cost — heat pump usually cheaper after grant

A new LPG boiler install runs £3,500–£7,000 in 2026, depending on tank arrangement (cylinder bank vs bulk) and the boiler position. Higher end of that range applies when the existing tank needs replacing or relocating. A typical rural 3-bed swap lands around £5,000.

Pre-grant heat-pump cost runs £8,000–£14,000 for a 7–14 kW unit with cylinder and emitter upgrades; rural LPG homes tend to need the higher end because of older fabric and larger floor areas. Call it £11,500 for a typical install. After the £7,500 BUS deduction the homeowner pays £4,000 — close to the new-LPG-boiler figure on a like-for-like basis, and the running-cost gap pulls strongly in the heat pump’s favour from year one.

Tank lease + supply contract — the unique LPG step

Unlike heating oil (where the homeowner usually owns the tank), most UK domestic LPG installations operate on a tank-lease basis: the supplier owns the tank, leases it to you for a peppercorn fee, and is your exclusive LPG supplier for the contract term. New installs typically come with a 2-year tie-in, then roll annually.

On switch to a heat pump, you’ll need to:

• Check your supply contract for tie-in expiry and any early-termination fee. The 2018 CMA Order materially loosened these, but they exist on some legacy contracts.
• Notify your supplier in writing of intent to switch off LPG. Standard notice is 4–8 weeks for tank removal.
• Co-ordinate the tank removal with your heat-pump install timeline. Most suppliers remove at no extra charge to the homeowner under the standard contract.

If your tank is owner-supplied (rare but it happens with secondhand purchases or unusual older installs), the decommissioning logistics are similar to oil — drain, lift, £400–£800.

Running cost — biggest gap of the three fossil options

At 2026 prices, heating a typical UK 3-bed semi with LPG costs roughly £1,400–£2,200 a year (12,000–15,000 kWh demand × 8–11p per kWh delivered fuel cost). A modern air-source heat pump in the same property uses 3,000–4,500 kWh of electricity (SCOP 3.5) at standard tariffs — about £750–£1,200 a year. The heat pump saves £500–£900 a year on standard tariffs; £700–£1,200 on heat-pump-specific tariffs (Octopus Cosy, British Gas Heat Pump Plus, EDF GoElectric).

The carbon angle

LPG emits roughly 0.21 kg CO₂ per kWh of fuel burned — between mains gas (0.20) and heating oil (0.27). A typical LPG-heated home using 13,000 kWh/year emits about 2.7 tonnes of CO₂ from heating. The same home on a heat pump emits 0.4–0.8 tonnes per year on the UK grid’s 2026 carbon intensity (~150 g/kWh) — roughly a 75% cut. The gap widens as the grid continues to decarbonise.

When LPG still makes sense (rare, but real)

Three scenarios where staying on LPG can still be the right call in 2026:

• Properties with no electricity-supply headroom. A handful of remote rural properties have single-phase supplies near capacity and would need an expensive DNO upgrade to add a 7+ kW heat pump. Pre-survey the supply first.
• Listed buildings where the outdoor unit fails permitted-development siting. Rare but possible on small-footprint listed cottages with no rear or side elevation that satisfies MCS 020 noise rules. Listed Building Consent is the first call.
• New-build estates where the developer has spec’d LPG as a stop-gap.Some 2018–2023 rural new builds were spec’d for LPG with the understanding the homeowner would later switch; the existing pipework and boiler may have years of remaining life. Switching still makes sense on running cost but may not be urgent until the boiler ages out.

Switching pathway — what to do this week

1. Run a free pre-survey at propertoasty.com/check to get the BUS-eligibility verdict for your specific property + an installer-ready report.
2. Send the report to 2–3 MCS-certified installers covering your area. Mention the LPG tank-removal logistics on the first conversation — most installers will price the heat pump separately from the tank decommissioning so you can compare cleanly.
3. Read your LPG supply contract for tie-in expiry; if you’re mid-contract with a penalty clause, time the heat-pump commissioning to align with expiry.

The takeaway

Of the three fossil heating fuels — mains gas, oil, LPG — LPG has the strongest running-cost case for switching to a heat pump in 2026. Day-one cost is similar after the BUS grant; annual savings are £500–£900 on standard electricity tariffs and meaningfully more on heat-pump-specific ones. The unique LPG step is unwinding the tank-supply contract, but the 2018 CMA Order made that materially easier than it used to be.