UK Heat Pump FAQ 2026

Typical 3-bed: £12,000-£15,000 gross, £4,500-£7,500 net after BUS grant. New builds: £4,500-£7,500 included in build price. Listed buildings: +£1,500-£3,500. See London Borough Breakdown for region variation.

The Boiler Upgrade Scheme pays £7,500 directly to your MCS installer, deducted from the final invoice. Your installer submits the application on your behalf — you sign the customer authorisation form. Approval takes 10-15 working days. See BUS 2026 Guide.

Wales uses BUS. Scotland has its own Home Energy Scotland scheme — more generous (up to £9,000 grant + £15,000 interest-free loan). NI has the Sustainable Energy Programme. See HES Subsidies.

Yes. Beyond BUS/HES: ECO4 and Great British Insulation Scheme (low-income), some council top-ups (Lambeth, Islington, Hackney), and limited green finance products. See All UK Grants.

Almost always yes if you can claim the BUS grant. Real-world savings vs gas: £200-£700/year on standard cap; £400-£1,200/year on Octopus Cosy. Payback typically 8-14 years on Tier 1 brand install. See Savings Calculator.

Yes. Modern air source heat pumps maintain output down to -15°C. UK design outdoor temperatures: -2°C London to -7°C Highlands — all within range. Ground source units work even more steadily (ground temp ~8-12°C year-round).

SCOP (Seasonal Coefficient of Performance) is heat output ÷ electricity input averaged over the heating season. UK ASHP: 3.0-3.4 good. GSHP: 4.0+ good. SCOP 3.0 means 1 kWh electricity becomes 3 kWh of heat. See SCOP Explained.

ASHP (air source) extracts heat from air — cheaper install (£10-15k), SCOP 3.0-3.5, suits most UK homes. GSHP (ground source) uses buried coils — pricier (£20-28k), SCOP 4.0+, suits larger homes or off-gas-grid with good garden space. See ASHP vs GSHP.

Often yes — heat pumps run at lower flow temperatures (35-50°C vs boiler's 60-80°C), so radiators need more surface area. Typically 4-8 radiators upgraded to K2/K3 (double/triple panel). Cost: £150-£300 per radiator fitted. Sometimes existing radiators are big enough — your installer's heat loss calc tells you.

Yes — heat pumps heat your cylinder to 50-55°C, with weekly Legionella cycles at 60°C. Same as a gas combi boiler delivers to your taps. The unvented cylinder (200-300L) provides hot water at mains pressure.

3-5 working days on-site, 6-10 weeks from first quote to commissioning. Listed buildings or planning permission: add 8-12 weeks. See Install Timeline.

Most homes: no — Permitted Development covers it since the May 2025 reform. Exceptions: listed buildings (need Listed Building Consent), conservation Article 4 zones, and any unit failing the 42 dB neighbour noise test. See Planning Permission.

MCS (Microgeneration Certification Scheme) is the UK quality mark for installers and equipment. Mandatory for BUS grant. Verify at mcscertified.com. See MCS Explained.

Spring (March-May) is optimal: shortest installer lead times, mild outdoor weather, fresh BUS budget, and you bank a full winter of savings. See Best Time of Year.

Ground-floor with private garden: usually yes. First-floor or above: complex — wall-mounted units typically need planning, and freeholder consent. Communal heat pumps for the building are common for new builds.

Top 3 in 2026: Mitsubishi Ecodan R290, Vaillant aroTHERM Plus, Daikin Altherma 3. Best value: Grant Aerona 290 (£1.5-2k cheaper). All hit SCOP 3.2+ and have 7-year warranties. See Best UK Brands.

R290 (propane) is the 2026 preferred choice — GWP 3, no F-Gas phase-out, fitted in current Mitsubishi, Vaillant, Samsung, LG, Grant. R32 (GWP 675) is still legal and excellent. R410A (GWP 2,088) banned for new installs. See F-Gas Rules.

Most homes: cylinder (£900-£1,400 installed, proven tech). Heat battery (Sunamp, Tepeo, £2,800-£5,500) wins when space is critical — flats, no airing cupboard, listed buildings. See Heat Battery vs Cylinder.

3-bed semi at SCOP 3.2 on standard cap: £1,100-£1,700/year. On Octopus Cosy: £700-£1,200/year. Compared with a gas boiler running cost: typically saves £200-£700/year. See Running Costs.

For most owners, yes. Cosy's 3 daily cheap windows (4-7am, 1-4pm, 10pm-12am at ~12.5p/kWh) save £180-£420/year vs standard cap if you schedule your heat pump properly. See Cosy vs Standard.

On standard cap: typically yes by £100-£400/year. On Octopus Cosy: definitely yes by £300-£800/year. Best case (new build with UFH on Cosy): £800-£1,500/year saving. Use our Savings Calculator for your specific home.

£150-£250 in most of UK (£200-£300 in London). Cover plans bundling service with parts: £180-£350/year. Annual service is required to keep manufacturer warranty valid. See Maintenance Cost.

15-25 years for a Tier 1 brand with annual service. Compressor often the limiting factor — usually 15-20 years. Compares with 12-15 years for typical gas boiler. Cylinder: 15-25 years.

3 layers: (1) home insurance for theft/damage/water egress, (2) manufacturer warranty for product faults (5-10 years), (3) MCS workmanship cover via HIES/RECC/QANW (2-6 years). See Insurance & Warranty.

Yes — UK home insurance requires disclosure of material changes. Most insurers don't increase premium. Email at install date with brand, model, MCS number.

Modern UK heat pumps: 28-42 dB(A) at 1m — quieter than a fridge. Peak winter defrost briefly 45-52 dB. The 42 dB at 1m from neighbour rule (MIS 020) is the legal limit. See Noise Levels.

For well-sited modern units, typically no — running noise is below urban background. Exceptions: very tight terrace gardens with unit against party wall, older pre-2020 units. Your installer must demonstrate ≤42 dB compliance before install.

Yes. With UK 2026 grid carbon intensity (~140 g/kWh) and SCOP 3.0+, heat pump CO₂/kWh of heat is 70-80% lower than gas boiler. Gap widens each year as the grid decarbonises further.

Yes — Listed Building Consent required but 75-85% of applications approved. Discreet siting (rear garden, hidden by hedging) and a heritage statement are key. See Listed Buildings.

Rough formula: floor area in m² × heat loss factor W/m² ÷ 1,000. Typical: new build 45 W/m², 1980s cavity 55, Victorian solid wall 95. A 100m² 1980s home needs 5-7 kW. Always confirm with a room-by-room heat loss calc. See Capacity by Size or use the Size Calculator.