Octopus Cosy Air Source Heat Pump
Octopus Energy's own heat pump, designed and built in the UK at its factory in Craigavon, Northern Ireland, and installed by Octopus or its Cosy Accredited Installers. Octopus says its median quote was £4,064 after the £7,500 grant (quotes from 1 June to 30 September 2026). It pairs with the Cosy Octopus tariff, which works with any heat pump.
Octopus Cosy air source heat pump price UK (2026)
The Boiler Upgrade Scheme takes £7,500 off in England and Wales (£9,000 for off-gas homes replacing oil or LPG heating, until 31 March 2027); your MCS-certified installer claims it for you. Scotland uses the Home Energy Scotland grant and loan instead; Northern Ireland has no equivalent. 0% VAT until 31 March 2027 is already reflected. Smallest model: Cosy 6 from £8,000 pre-grant. Largest: Cosy 9 up to £12,000. Running cost estimated at ~10,000 kWh of heat a year and 26.32p/kWh electricity (October to December 2026 cap). Accurate as at October 2026.
Warranty: 8-year manufacturer warranty on the hardware as standard, plus 2 years on workmanship. Cosy Care (paid, from £12 a month) extends cover on Octopus installs.SCOP is the MCS-certified seasonal efficiency; sound power is the maker's declared ErP figure, the like-for-like noise measure (what you hear next door depends on distance and siting). Prices are indicative; confirm with your MCS-certified installer.
Available Models
Cosy 6
Cosy 9
Specifications from the makers' datasheets and the MCS product directory, checked October 2026; prices are indicative. Running costs: Estimate for 10,000 kWh of heat a year at 26.32p per kWh (Ofgem price cap, October to December 2026), at a 45°C design flow temperature: the midpoint of the certified 35°C and 55°C SCOPs. Post-grant figures illustrate the £7,500 Boiler Upgrade Scheme in England and Wales. Confirm current models and exact pricing with your MCS-certified installer.
Pros
- Octopus median quote £4,064 after the grant (June to September 2026)
- Designed and built in the UK
- 8-year hardware warranty as standard
- Your installer handles the grant paperwork
Cons
- Only available through Octopus or its accredited installers
- Newer hardware: Cosy 6 launched in late 2023, Cosy 9 in 2025
Best for
Price-led switchers happy to buy and install through Octopus
Octopus Cosy pricing and grants in your region
The hardware is the same everywhere; the support is not. England and Wales use the £7,500 Boiler Upgrade Scheme, Scotland the Home Energy Scotland grant and loan, and Northern Ireland currently has no grant. Each regional guide covers exactly what applies.
Octopus Cosy air source heat pump FAQ
How much is a Octopus Cosy air source heat pump installed in the UK (2026)?
A Octopus Cosy air source heat pump costs £8,000 - £12,000 fully installed in the UK before any support (indicative, June 2026, with 0% VAT already applied). After the £7,500 Boiler Upgrade Scheme grant in England and Wales, that is illustratively £500 - £4,500 out of pocket. The smallest model (Cosy 6) starts around £8,000 pre-grant; the largest (Cosy 9) tops out around £12,000. Combi-to-cylinder conversions and radiator upgrades add to these figures, so always confirm with a written quote.
Is a Octopus Cosy heat pump eligible for the £7,500 grant?
Yes. Every air-to-water unit on this page qualifies for the Boiler Upgrade Scheme in England and Wales when it is fitted by an MCS-certified installer, who applies for the grant on your behalf so it comes straight off the quote. Off-gas homes replacing oil or LPG heating can claim £9,000 instead, until 31 March 2027. Scotland uses the Home Energy Scotland grant and loan instead; Northern Ireland currently has no equivalent scheme. Grant details accurate as at October 2026.
Is Octopus Cosy a good air source heat pump brand?
Octopus Energy's own heat pump, designed and built in the UK at its factory in Craigavon, Northern Ireland, and installed by Octopus or its Cosy Accredited Installers. Octopus says its median quote was £4,064 after the £7,500 grant (quotes from 1 June to 30 September 2026). It pairs with the Cosy Octopus tariff, which works with any heat pump. Octopus Cosy is best suited to price-led switchers happy to buy and install through octopus.
What is the warranty on a Octopus Cosy heat pump?
8-year manufacturer warranty on the hardware as standard, plus 2 years on workmanship. Cosy Care (paid, from £12 a month) extends cover on Octopus installs. Workmanship cover for the installation itself comes separately from your installer. Most extended terms depend on registering the product and annual servicing, so keep your installation paperwork and MCS certificate.
How efficient is a Octopus Cosy air source heat pump?
The Cosy 6 has an MCS-certified SCOP (seasonal coefficient of performance) of 4.31 at 35°C flow and 3.23 at 55°C, so over a heating season each 1 kWh of electricity delivers about 3.23 to 4.31 kWh of heat, depending on how hot your system runs. At a 45°C design flow and the Ofgem cap rate (26.32p/kWh), 10,000 kWh of heat costs an estimated £700 a year, against roughly £890 for a 90%-efficient gas boiler at the current cap gas rate (7.97p/kWh from 1 October 2026). Estimates, not quotes; heat pump time-of-use tariffs can do better.
How long does a Octopus Cosy heat pump last?
With an annual service, heat pumps are generally expected to run well beyond their warranty period (Octopus Cosy: 8 years). Longevity depends on correct sizing (the MCS heat-loss survey), sensible siting and regular servicing. Confirm design life and extended-warranty options for your specific model with your MCS-certified installer.
Octopus Cosy vs other brands: which should I pick?
Octopus Cosy sits at the value end of the UK market on pre-grant pricing. It is sold and installed by Octopus or its accredited installers; Octopus says its median quote was £4,064 after the grant (June to September 2026). See the side-by-side comparisons below for direct head-to-head specs.
Octopus Cosy vs other heat pump brands
Heat pump guides
- Air source heat pump installation cost in the UK
- The best air source heat pumps in the UK, compared
- The £7,500 Boiler Upgrade Scheme, explained
- Air source heat pumps: costs, grants and brands
- Heat pump grants in London
- Heat pump grants in South East England
- Heat pump grants in South West England
- Heat pump grants in East of England
- Heat pump grants in East Midlands
- Heat pump grants in West Midlands
- Heat pump grants in Yorkshire and the Humber
- Heat pump grants in North West England
- Heat pump grants in North East England
- Heat pump grants in Scotland
- Heat pump grants in Wales
- Heat pump grants in Northern Ireland
Other heat pump brands
Where are you?
See indicative costs and local installers for your area