Heat Pump vs LPG Boiler Running Cost UK 2026

Heat pump vs LPG: annual + 10-year running cost, LPG tank rental + safety inspection, BUS grant economics, when LPG still makes sense.

LPG bulk tank installation representing LPG-to-heat-pump conversion economics
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By Rob Griffiths17 June 2026 · 5 min read

If you're one of the ~150,000 UK households heated by LPG, the case for switching to a heat pump is strong - though typically tighter than for oil. This guide walks through the running-cost maths, the often-overlooked LPG ancillary costs (tank rental, safety inspections, supply scheduling), and the situations where staying on LPG still makes sense.

Annual running cost: head-to-head

Typical UK 3-bed property, mid-2026 prices.

Realistic annual cost for a typical UK 3-bed semi (heat demand ~11,000-13,000 kWh/year):

  • LPG boiler at ~80% efficiency, LPG bulk price ~55-75p/litre (varies by supplier + delivery distance), propane heat value ~7.1 kWh/litre: ~1,600-2,000 litres/year × GBP 0.55-0.75 = GBP 880-1,500/year direct fuel cost. Add tank rental (GBP 100-200/year) + 2-yearly safety inspection (~GBP 70-100, amortised ~GBP 35-50/year) + boiler servicing (~GBP 80-120/year) = total ~GBP 1,100-1,800/year for fuel + ancillaries.
  • Heat pump on standard electricity tariff at COP 3.0, ~27p/kWh: ~4,000 kWh × 27p = GBP 1,080/year.
  • Heat pump on Cosy Octopus or similar tariff (~16p effective rate), COP 3.0: ~4,000 kWh × 16p = GBP 640/year.

Net annual saving: GBP 460-1,160 on standard rates, GBP 460-1,160 on heat-pump tariff. Margin is tighter than the oil-to-heat-pump case because LPG (especially on a fixed-price contract) is cheaper per kWh than oil. Tank rental + safety inspection costs add roughly GBP 150-250/year of non-fuel cost to the LPG side that the heat pump eliminates.

10-year cost analysis including install

Break-even is 4-7 years post-grant for typical LPG-heated properties.

Two 10-year scenarios for a typical UK 3-bed LPG-heated semi:

Stay on LPG:

  • LPG boiler replacement during the period (~GBP 4,000-5,500 typical).
  • Annual LPG + tank rental + servicing: ~GBP 1,400 average.
  • 10-year total: ~GBP 18,000-19,500 (one boiler replacement during).

Switch to heat pump now:

  • Install cost: ~GBP 11,000 pre-grant - £7,500 BUS = ~GBP 3,500-6,500 net.
  • Annual electricity (Cosy Octopus): ~GBP 700-1,000.
  • Tank removal / decommission (one-off): ~GBP 200-800.
  • 10-year total: ~GBP 11,500-15,500.

Net 10-year saving: ~GBP 3,500-7,500 in favour of heat pump. Tighter than oil but still positive across the realistic range.

LPG-specific costs people forget

Three ancillary costs that don't appear on the LPG fuel bill.

1. Tank rental. Most UK LPG users rent the tank from their supplier (Calor, Flogas, Avantigas) rather than owning it outright. Typical rental: GBP 100-200/year. Switching supplier mid-contract often incurs tank-removal + reinstall costs of GBP 300-500. Heat-pump switching eliminates this ongoing cost + the supplier-lock-in entirely.

2. Safety inspections. LPG installations require a Gas Safe inspection every 2 years (cost GBP 70-100). Tanks themselves need re-inspection every 10 years (cost GBP 200-400). These are mandatory + can't be skipped.

3. Delivery scheduling + winter supply risk. LPG delivery requires forward planning + bulk orders (1,000+ litres at a time). In cold winters, delivery slots can slip 2-3 weeks - homes running close to empty have been left without heat during cold snaps. Heat pumps eliminate this delivery-dependency entirely (electricity supply is virtually 100% available in UK domestic homes).

Hot water cost comparison

LPG comes out slightly ahead - until you add ancillary costs.

Hot water represents ~20-30% of UK home heat demand. Comparison:

  • LPG boiler producing hot water (~80% efficiency, 65p/litre LPG): ~9-10p per kWh of hot water delivered.
  • Heat pump producing hot water (~COP 2.5-3.0, lower than space heating because tank temp is higher): ~9-11p per kWh on standard electricity, ~5-7p per kWh on Cosy Octopus tariff.

So hot water costs are similar on standard rates + heat pump comes out ahead on heat-pump-optimised tariffs. Add LPG's ancillary costs + the heat pump's case strengthens further.

Switching from LPG: timeline + tank removal

The decommission step is more involved than for oil.

The LPG-to-heat-pump conversion timeline:

  1. Get an MCS heat-loss survey from your chosen installer. 2-4 weeks for survey + design.
  2. BUS grant application handled by installer alongside the quote.
  3. Heat pump install: 3-5 days on-site for a typical 3-bed property.
  4. Heat pump commissioning + initial use: typically leave the LPG system as backup for the first winter.
  5. LPG tank decommission: contact your supplier to schedule removal. Tank is typically removed at no charge (the supplier owns it on rental contracts); your responsibility is making the area accessible. Cost can apply if you own the tank outright (~GBP 500-1,000 disposal).
  6. Cancel supply contract + tank rental. Check minimum-term commitments - some LPG supply contracts have early-termination fees.

Plan around the LPG contract end-date if practical - cancelling mid-contract can incur GBP 200-800 in early-termination charges depending on supplier + remaining term.

Q01Is a heat pump cheaper to run than LPG heating?
Yes - typically GBP 460-1,160/year cheaper on standard electricity rates, with the gap widening on heat-pump-optimised tariffs like Cosy Octopus. Tighter margin than oil-to-heat-pump but still positive, and elimination of tank rental + safety-inspection costs adds non-fuel savings.
Q02How long until a heat pump pays back vs LPG?
Typically 4-7 years post-£7,500 BUS grant. Slightly longer payback than oil-to-heat-pump (4-6 years) because LPG fuel is cheaper per kWh than oil, narrowing the annual saving gap.
Q03What happens to my LPG tank when I switch?
Rented tanks are typically removed at no charge by the supplier when you cancel the contract; your responsibility is making the area accessible. Owned tanks have removal cost (GBP 500-1,000). Check supplier contract terms + minimum-commitment dates before cancelling.
Q04Will I still need a Gas Safe inspection?
No - once the LPG appliance + tank are removed, no Gas Safe inspections are required. This saves GBP 35-50/year amortised cost on top of fuel-bill reduction. Make sure the installer issues a removal certificate so future home insurance + sale documentation is clean.