Octopus Cosy Air Source Heat Pump
Octopus Energy's own heat pump, designed in the UK and installed by Octopus's in-house teams at disruptive prices - their average install runs about £4,460 after the £7,500 grant, with many quotes near £1,000. Pairs with Octopus's heat pump tariffs for cheap running costs.
Octopus Cosy air source heat pump price UK (2026)
The Boiler Upgrade Scheme takes £7,500 off in England and Wales (£9,000 for oil and LPG heated homes from 21 July 2026); 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 25p/kWh electricity. Accurate as at June 2026.
Specifications and pricing are indicative for the UK market as at June 2026. Confirm current models and exact pricing with your MCS-certified installer.
Available Models
Cosy 6
Cosy 9
Specifications and pricing are indicative for the UK market as at June 2026. Running costs assume ~10,000 kWh of heat a year at 25p/kWh (Ofgem cap average; changes quarterly). 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
- Cheapest mainstream route to a heat pump (avg ~£4,460 post-grant via Octopus)
- UK-designed, end-to-end install by one company
- Tariff pairing cuts running costs
- Grant handled entirely for you
Cons
- Install only through Octopus (no independent quotes on the hardware)
- Newer hardware with a shorter track record
- Standard 5-year warranty
Best for
Price-led switchers happy to go with one vertically integrated provider
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, 6kW heat output) starts around £8,000 pre-grant; the largest (Cosy 9, 9kW) 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. From 21 July 2026 homes heated by oil or LPG can claim £9,000 instead of £7,500. Scotland uses the Home Energy Scotland grant and loan instead; Northern Ireland currently has no equivalent scheme. Grant details accurate as at June 2026.
Is Octopus Cosy a good air source heat pump brand?
Octopus Energy's own heat pump, designed in the UK and installed by Octopus's in-house teams at disruptive prices - their average install runs about £4,460 after the £7,500 grant, with many quotes near £1,000. Pairs with Octopus's heat pump tariffs for cheap running costs. Octopus Cosy is best suited to price-led switchers happy to go with one vertically integrated provider.
What is the warranty on a Octopus Cosy heat pump?
Octopus Cosy backs the unit with a 5-year warranty and the compressor with 5 years (indicative; confirm the current terms for your specific model, as accredited-installer schemes often extend them). Workmanship cover for the installation itself comes separately from your installer and should be at least 12 months. Warranty claims generally require professional installation and servicing per the manual, so keep your installation paperwork and MCS certificate.
How efficient is a Octopus Cosy air source heat pump?
The Cosy 6 carries a SCOP (seasonal coefficient of performance) of 4.1, meaning that across a heating season every 1 kWh of electricity in delivers about 4.1 kWh of heat. At Ofgem cap electricity prices (~25p/kWh) and a typical 10,000 kWh annual heat demand, that is an estimated running cost of around £610 a year, against roughly £640 to £810 for a 90%-efficient gas boiler at the 2026 cap gas rates (5.74p rising to 7.33p/kWh on 1 July 2026). Estimates, not quotes; heat-pump time-of-use tariffs can do better.
How long does a Octopus Cosy heat pump last?
Octopus Cosy warrants the unit for 5 years and the compressor for 5, and with an annual service heat pumps are generally expected to run well beyond their warranty period. 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 the lowest-cost mainstream route: Octopus designs the unit and installs it in-house, averaging about £4,460 after the grant. See the side-by-side comparisons below for direct head-to-head specs.
Compare with other brands
Where are you?
See indicative costs and local installers for your area