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Mitsubishi Electric Ecodan Air Source Heat Pump in South Harefield, London

Japan / UKUK brandClimate Zone 3

Looking at a Mitsubishi Electric Ecodan air source heat pump for your South Harefield home? Installed pricing for Mitsubishi Electric Ecodan in London runs £9,000 - £14,000 before any support (indicative, June 2026). After the £7,500 Boiler Upgrade Scheme grant, that is illustratively £1,500 - £6,500 out of pocket; your MCS-certified installer claims the grant for you. Homes keeping their existing radiators, from a UK-built range.

Mitsubishi Electric Ecodan's pre-grant pricing of £9,000 - £14,000 aligns closely with the local typical installed range of £8,400 - £14,400, offering a solid balance of performance and value.

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.

Mitsubishi Electric Ecodan is a UK brand, which many buyers value for local support and parts availability. It makes no difference to the grant: every air-to-water brand here qualifies on the same terms when fitted by an MCS-certified installer.

£9,000 - £14,000
Installed before grant
£1,500 - £6,500
After grant (illustrative)
4.62
Best SCOP at 35°C (MCS)
3 yr (up to 7)
Warranty (standard)

Mitsubishi Electric Ecodan Models Available

Ecodan R290 8.5kW

£9,000 - £13,000
installed before grant, indicative
Size
8.5kW
SCOP 35°C / 55°C (MCS)
4.47 / 3.51
Running cost (est.)
~£660/yr
Sound power
54 dB(A)
Suitable for
3-4 bed semi or detached
After £7,500 grant (illustrative)
£1,500 - £5,500
Outdoor unit (HxWxD)
1040x1050x480mm
Weight
103kg

Ecodan R290 10kW

£10,000 - £14,000
installed before grant, indicative
Size
10kW
SCOP 35°C / 55°C (MCS)
4.62 / 3.48
Running cost (est.)
~£650/yr
Sound power
55 dB(A)
Suitable for
larger or older detached homes
After £7,500 grant (illustrative)
£2,500 - £6,500
Outdoor unit (HxWxD)
1040x1050x480mm
Weight
120kg

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 Mitsubishi Electric Ecodan Performs in South Harefield's Climate

ExcellentClimate Zone 3 | R290 refrigerant

Mitsubishi Electric Ecodan 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 (4.47 at 35°C, 3.51 at 55°C) and running costs at the lower end of estimates. It reaches 75°C flow, which helps existing radiators carry the load without a full re-pipe.

Noise Levels in a Regional Area

Mitsubishi Electric Ecodan declares a sound power of 54 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. With more space between homes, meeting the noise standard is usually easier, but your installer still checks the siting.

Pros

  • Made in Livingston, Scotland
  • R290 range reaches 75°C flow, so existing radiators can often stay
  • Quiet Mark certified (R290 8.5, 10 and 12 kW)
  • The 8.5, 10 and 12 kW sizes all come in single phase

Cons

  • Standard warranty is 3 years; 7 needs a top-tier Mitsubishi installer
  • Single-phase 10 and 12 kW units need a dedicated 32 A or 40 A supply

Grants for Mitsubishi Electric Ecodan in South Harefield

Boiler Upgrade Scheme

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

Every Mitsubishi Electric Ecodan 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. 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 South Harefield 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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All brand costs in South HarefieldFull Mitsubishi Electric Ecodan review

Heat pump guides for London

Mitsubishi Electric Ecodan in South Harefield: Frequently Asked Questions

How much does an air source heat pump cost in South Harefield?
Most South Harefield households pay £900 to £6,900 out of pocket (indicative, June 2026) after the £7,500 Boiler Upgrade Scheme grant is deducted from a typical pre-grant installed price of £8,400 to £14,400. 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 South Harefield?
South Harefield 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. 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 South Harefield's climate?
South Harefield 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 South Harefield?
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 South Harefield?
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 South Harefield?
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 South Harefield?
In South Harefield'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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