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Daikin Altherma Air Source Heat Pump in Lymm, North West England

JapanClimate Zone 4

Looking at a Daikin Altherma air source heat pump for your Lymm home? Installed pricing for Daikin Altherma in North West England runs £7,000 - £14,000 before any support (indicative, June 2026). After the £7,500 Boiler Upgrade Scheme grant, that is illustratively £0 - £6,500 out of pocket; your MCS-certified installer claims the grant for you. Buyers wanting a split system with a small outdoor unit, or 70°C flow for radiators (3 H HT).

Daikin Altherma's pre-grant pricing of £7,000 - £14,000 aligns closely with the local typical installed range of £7,900 - £13,900, offering a solid balance of performance and value.

Air source heat pumps are well proven in this climate. Expect a modest efficiency dip on the coldest mornings, when units run short defrost cycles, but seasonal performance (SCOP) remains strong for a correctly sized system. The MCS heat-loss survey carried out before installation makes sure the unit and radiators are sized for your home rather than a brochure average.

£7,000 - £14,000
Installed before grant
£0 - £6,500
After grant (illustrative)
4.47
Best SCOP at 35°C (MCS)
2 yr (up to 7)
Warranty (standard)

Daikin Altherma Models Available

Altherma 3 R 8kW

£7,000 - £12,000
installed before grant, indicative
Size
8kW
SCOP 35°C / 55°C (MCS)
4.36 / 3.24
Running cost (est.)
~£695/yr
Sound power
62 dB(A)
Suitable for
3-4 bed homes
After £7,500 grant (illustrative)
£0 - £4,500
Outdoor unit (HxWxD)
740x884x388mm
Weight
58.5kg

Altherma 3 H HT 14kW

£10,000 - £14,000
installed before grant, indicative
Size
14kW
14 is the size class; rated output 13 kW at -10°C
SCOP 35°C / 55°C (MCS)
4.47 / 3.54
Running cost (est.)
~£655/yr
Sound power
54 dB(A)
Suitable for
large or hard-to-heat homes
After £7,500 grant (illustrative)
£2,500 - £6,500
Outdoor unit (HxWxD)
1003x1270x533mm
Weight
146kg

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 Daikin Altherma Performs in Lymm's Climate

ExcellentClimate Zone 4 | R32 refrigerant

Daikin Altherma handles this temperate climate (zone 4) comfortably. Cold snaps trigger short defrost cycles that trim efficiency slightly, but a correctly sized unit holds a seasonal efficiency near its certified SCOP (4.36 at 35°C, 3.24 at 55°C). The MCS heat-loss survey confirms output and radiator sizing for your home.

Noise Levels in a Built-Up Area

Daikin Altherma declares a sound power of 62 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

  • Split design with a compact outdoor unit (58.5 kg for the 3 R 8kW)
  • Altherma 3 H HT reaches 70°C flow for radiator systems
  • Rated to work down to -25°C (3 R) and -28°C (3 H HT)

Cons

  • Standard warranty is 2 years; 5 needs Stand By Me activation and annual maintenance
  • The 3 R 8kW has a high sound power (62 dB(A)), so siting matters

Grants for Daikin Altherma in Lymm

Boiler Upgrade Scheme

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

Every Daikin Altherma air-to-water model on this page qualifies for the Boiler Upgrade Scheme in North West England 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 North West England→

The heating picture in North West England

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.

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 Lymm 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 North West England

Daikin Altherma in Lymm: Frequently Asked Questions

How much does an air source heat pump cost in Lymm?
Most Lymm 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 Lymm?
Lymm 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 Lymm's climate?
Lymm has a temperate climate with cool winters. Air source heat pumps are well proven in this climate. Expect a modest efficiency dip on the coldest mornings, when units run short defrost cycles, but seasonal performance (SCOP) remains strong for a correctly sized system. The MCS heat-loss survey carried out before installation makes sure the unit and radiators are sized for your home rather than a brochure average.
Is a heat pump cheaper to run than a gas boiler in Lymm?
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 Lymm?
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 Lymm?
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 Lymm?
Lymm sits in climate zone 4 on our 1-7 scale, where every brand we track performs well. The differences are in flow temperature (the R290 units reach 70 to 75°C for radiator systems), warranty terms, declared sound power and price, which our brand comparisons set side by side.
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