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Aira Air Source Heat Pump in Harrow, London

SwedenClimate Zone 3

Looking at a Aira air source heat pump for your Harrow home? Installed pricing for Aira in London runs £14,229 - £19,500 before any support (indicative, June 2026). After the £7,500 Boiler Upgrade Scheme grant, that is illustratively £6,729 - £12,000 out of pocket; your MCS-certified installer claims the grant for you. Homeowners who want one company to handle design, installation and upkeep, and are happy to pay a monthly plan for 15-year cover.

Aira sits above the £7,900 - £13,900 typical pre-grant installed range for this area. The premium reflects Aira's specification and efficiency, which usually pays back through lower running costs over the system's life. The grant applies the same either way.

Air source heat pumps perform strongly in this part of the UK. With comparatively mild winter temperatures, a correctly sized unit holds its seasonal efficiency (SCOP) well, and running costs sit toward the lower end of estimates. The MCS heat-loss survey that comes with every Boiler Upgrade Scheme installation confirms the right output and radiator sizing for your home.

£14,229 - £19,500
Installed before grant
£6,729 - £12,000
After grant (illustrative)
4.62
Best SCOP at 35°C (MCS)
5 yr (up to 15)
Warranty (standard)

Aira Models Available

Aira 8kW

£14,229 - £19,500
installed before grant, indicative
Size
8kW
Aira: output at -7°C/35°C; ErP rated heat output 9.2 kW at 55°C
SCOP 35°C / 55°C (MCS)
4.62 / 3.52
Running cost (est.)
~£645/yr
Sound power
56 dB(A)
Suitable for
homes of 150 to 200 m² (Aira's sizing guide)
After £7,500 grant (illustrative)
£6,729 - £12,000
Outdoor unit (HxWxD)
1005x1216x425mm
Weight
126kg

Specifications and pricing are indicative for the UK market as at June 2026. Running costs assume ~10,000 kWh of heat a year at 26.32p/kWh (Ofgem cap average, October to December 2026; changes quarterly). Confirm current models and exact pricing with your MCS-certified installer.

How Aira Performs in Harrow's Climate

ExcellentClimate Zone 3 | R290 refrigerant

Aira performs at its best in this mild southern climate (zone 3 on our 1-7 scale). Expect seasonal efficiency in line with its certified SCOP (4.62 at 35°C, 3.52 at 55°C) and running costs at the lower end of estimates. It reaches 70°C flow, which helps existing radiators carry the load without a full re-pipe.

Noise Levels in a Built-Up Area

Aira declares a sound power of 56 dB(A) for this model: the noise the unit itself emits. What you hear next door is much lower and falls with distance, and permitted development rules require the installation to meet the MCS noise standard at the nearest neighbour. In built-up areas the outdoor unit often sits close to neighbouring homes, so ask your installer to show you the noise calculation for your spot.

Pros

  • Designed, sold, installed and maintained by Aira itself
  • R290 refrigerant, rated A+++ at 35°C
  • 15 years of parts, labour and maintenance cover on the All Inclusive Plan (first year free)
  • Publishes real-world UK performance data: average SPF 3.79 for November to March
  • Published pricing: £7,150 to £12,000 after the grant, per Aira

Cons

  • Only available through Aira, so there are no competing quotes on the same hardware
  • Without the paid plan, the product warranty is 5 years, parts only, with no labour
  • Aira's headline SCOP of 4.7 is above its MCS-listed figures (4.40 to 4.62)
  • Declared sound power of 56 dB(A) (8 kW), higher than the LG and NIBE models here (49 to 50 dB(A))

Grants for Aira in Harrow

Boiler Upgrade Scheme

£7,500 off, claimed for you by your MCS-certified installer

Every Aira air-to-water model on this page qualifies for the Boiler Upgrade Scheme in London when fitted by an MCS-certified installer, who applies on your behalf so the grant comes straight off the quote. Homes heated by oil or LPG get £9,000 until March 2027. The EPC precondition was removed in April 2026 and the scheme runs to 2030. 0% VAT until 31 March 2027 applies on top. Accurate as at July 2026.

Full grant details for London→

The heating picture in London

Most homes here heat with a mains-gas boiler, and the Ofgem price cap gas rate has risen 39% since spring 2026 (5.74p per kWh in April-June to 7.97p from 1 October 2026). With £7,500 off through the Boiler Upgrade Scheme and 0% VAT until March 2027, replacing the boiler with an air source heat pump at end-of-life is now cost-competitive up front and on running costs. London homes are mostly gas-heated terraces and flats; air-to-air units (£2,500 grant) suit many flats where a wet system is impractical.

There is no gas ban in the UK and nobody is forcing the switch. The pressure is price: the Ofgem price cap gas unit rate has risen 39% since spring 2026 (5.74p per kWh in April-June to 7.97p from 1 October 2026). For Harrow households on a gas boiler, the practical takeaway is to plan ahead: keep using and repairing the boiler you have, but when it reaches end-of-life, pricing a heat pump against a new boiler (with the £7,500 Boiler Upgrade Scheme and 0% VAT in the maths) is now the rational default.

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Heat pump guides for London

Aira in Harrow: Frequently Asked Questions

How much does an air source heat pump cost in Harrow?
Most Harrow households pay £400 to £6,400 out of pocket (indicative, June 2026) after the £7,500 Boiler Upgrade Scheme grant is deducted from a typical pre-grant installed price of £7,900 to £13,900. Your MCS-certified installer claims the grant for you, so the discount comes straight off the quote. 0% VAT on residential installations (until 31 March 2027) is already reflected in quoted prices. Combi-to-cylinder conversions and radiator upgrades push costs toward the top of the range.
What heat pump grants are available in Harrow?
Harrow households can use the Boiler Upgrade Scheme: £7,500 off an air-to-water or ground-source heat pump (£2,500 for air-to-air, £5,000 for biomass), rising to £9,000 for homes heated by oil or LPG until March 2027. The EPC-certificate precondition was removed on 28 April 2026, and the scheme has been extended to 2030. Your installer must be MCS-certified and applies on your behalf, so the grant comes straight off the quote. 0% VAT on residential installations applies until 31 March 2027 on top.
Do air source heat pumps work in Harrow's climate?
Harrow has a mild southern climate with relatively gentle winters. Air source heat pumps perform strongly in this part of the UK. With comparatively mild winter temperatures, a correctly sized unit holds its seasonal efficiency (SCOP) well, and running costs sit toward the lower end of estimates. The MCS heat-loss survey that comes with every Boiler Upgrade Scheme installation confirms the right output and radiator sizing for your home.
Is a heat pump cheaper to run than a gas boiler in Harrow?
On the Ofgem price cap (electricity 26.32p per kWh, gas 7.97p per kWh from 1 October 2026), a heat pump running at a seasonal efficiency (SCOP) of 3.8 to 4.5 delivers heat at roughly 5.8 to 6.9p per kWh, against roughly 8.9p for a 90%-efficient gas boiler, so it runs below gas-boiler cost on cap rates. The 39% rise in the gas rate since spring 2026 has tilted the comparison further toward the heat pump. Households on heat-pump time-of-use tariffs typically do better again, though tariffs change so compare current offers. These are estimates: your actual costs depend on your tariff, your home's heat loss and how the system is set up.
How does the installation process work in Harrow?
Every grant-backed installation starts with a heat-loss survey of your home (an MCS requirement), which determines the heat pump output, the radiator sizing and whether your hot water cylinder needs upgrading or adding. The installer then fits the outdoor unit, cylinder and controls, commissions the system and walks you through it. If a gas boiler is being removed, that part of the work must be done by a Gas Safe registered engineer. Timescales are usually measured in days, not weeks; your installer will confirm after the survey.
What size air source heat pump do I need in Harrow?
Sizing in the UK is driven by your home's heat loss, not just bedroom count: the heat-loss survey that comes with every Boiler Upgrade Scheme installation calculates it room by room. As a rough guide from the current UK model ranges, smaller well-insulated homes suit units around 5 to 8kW of heat output, typical 3 to 4 bed homes around 8 to 12kW, and large or older properties may need more. In your milder climate, correctly sized systems hold their efficiency well through winter.
Which air source heat pump brand is best for Harrow?
In Harrow's milder climate (zone 3 on our 1-7 scale), every brand we track performs well, so price and installer support matter most. Octopus says its median quote for the Cosy was £4,064 after the grant (June to September 2026), installed by Octopus or its accredited installers; the other brands are fitted by independent MCS-certified installers, so you can compare quotes.
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More Air Source Heat Pump Info for Harrow

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