Octopus Cosy Accredited Installer — Greentech Renewables, Manchester
Greentech Renewables has been an Octopus Cosy Accredited Installer since 2026, authorised by Octopus Energy to design and fit the full Cosy heat pump range (6, 9 and 15.5kW) for homes across Greater Manchester and the North West. The team has completed over 1,000 Octopus Cosy installations, alongside 2,000+ renewable energy installations overall since 2009, and handles the full process in-house — survey, Boiler Upgrade Scheme grant application (£7,500, rising to £9,000 for homes switching from oil or LPG), installation, and Octopus Cosy tariff set-up.
"Every Cosy install starts with an honest survey — we tell customers straight away if their home isn't a good fit, rather than sell a system that won't perform. That's why over 1,000 Greater Manchester homes have trusted us with their Cosy installation since we were accredited in 2026."
What Is an Octopus Cosy Accredited Installer?
An Octopus Cosy Accredited Installer is a heating engineer vetted and authorised by Octopus Energy to design and fit the Cosy heat pump range to Octopus's own installation standard. It's a small national pool of installers — most concentrated in Scotland and the South — and Greentech Renewables is one of the few active accredited partners covering Greater Manchester and the North West.
The accreditation sits on top of MCS certification and HIES Consumer Code membership, so you get Octopus's install standard plus every consumer protection that comes with the Boiler Upgrade Scheme.
How Greentech Installs the Octopus Cosy Heat Pump (6 / 9 / 15.5kW)
The Octopus Cosy range is available in three sizes — 6kW, 9kW and 15.5kW — sized to match a home's heat loss rather than its floor area alone. During the free home survey we run a room-by-room heat loss calculation, review your existing radiators, and confirm the correct Cosy unit for your property. Most installations complete in 1–2 days.
- Cosy 6kW — flats and small 2–3 bed homes with modern insulation.
- Cosy 9kW — typical 3–4 bed Manchester semi-detached and detached homes.
- Cosy 15.5kW — larger 4–5 bed detached, older solid-wall properties or high hot-water demand.
Octopus Cosy Tariff Savings vs a Gas Boiler
The Cosy Octopus tariff prices electricity roughly 50% below the price cap across three off-peak windows a day — matched to when a well-set-up heat pump does most of its heating. Octopus states an average heat pump customer on Cosy Octopus saves around £315 a year on heating costs compared with a gas boiler on a standard variable tariff, before factoring in that you no longer pay a gas standing charge.
The Boiler Upgrade Scheme Grant + Cosy Tariff, Combined (£7,500–£9,000)
The £7,500 BUS grant reduces the upfront cost of fitting a Cosy heat pump; the Cosy Octopus tariff reduces the ongoing running cost. They stack. Homes replacing oil or LPG heating qualify for £9,000 from July 2026. Greentech handles the full BUS application on your behalf as part of the install — see our Boiler Upgrade Scheme 2026 guide for the step-by-step.
Is My Manchester Home Suitable for a Cosy Heat Pump? (Do I Need New Radiators?)
The Cosy range is designed to run at flow temperatures up to 75°C, so it's compatible with most existing radiator systems — a genuine advantage over lower-temperature heat pumps that force radiator upgrades. A small number of homes may need one or two radiators resized after survey; a full radiator replacement is the exception. Your survey covers this before you commit.
- Runs up to 75°C flow — most rads stay
- R290 natural refrigerant — 82% less carbon
- Wireless Cosy Pods — room-by-room control
- Managed via the Octopus app
Frequently Asked Questions
What is an Octopus Cosy Accredited Installer?
An Octopus Cosy Accredited Installer is a heating engineer vetted and authorised by Octopus Energy to fit the Cosy heat pump range to Octopus's installation standard. Greentech Renewables has held this accreditation since 2026, has completed over 1,000 Octopus Cosy installations, and covers Greater Manchester and the North West.
How does the Octopus Cosy heat pump work?
The Cosy 6 extracts heat from outside air, even down to -20°C, and amplifies it via a refrigerant cycle to heat your home and hot water. It pairs with the Cosy Octopus tariff, which prices electricity roughly 50% below the price cap across three off-peak windows a day.
How much can I save on the Cosy Octopus tariff?
Octopus Energy states an average heat pump customer on Cosy Octopus saves around £315 a year on heating costs compared with a gas boiler customer on a standard variable tariff, including no longer paying gas standing charges. Actual savings depend on home size and usage.
Do I still get the Boiler Upgrade Scheme grant with Octopus Cosy?
Yes. The standard Boiler Upgrade Scheme grant is £7,500 towards an air source heat pump, rising to £9,000 if you're replacing an oil or LPG heating system. It applies regardless of which energy tariff you switch to afterwards, so it combines with Cosy Octopus. Greentech Renewables handles the grant application as part of the installation.
Will I need to replace my radiators for an Octopus Cosy heat pump?
Usually not. The Cosy range is designed to run at higher flow temperatures — up to 75°C — so it's compatible with most existing radiator systems. A small number of homes may need a radiator upgraded or resized after survey, but a full replacement is the exception rather than the rule.
Who is the Octopus Cosy heat pump for?
It suits homeowners replacing a gas, oil, or LPG boiler who want lower running costs and a smart, app-controlled heating system — particularly useful for homes in Greater Manchester with a valid EPC and no outstanding loft or cavity wall insulation recommendations.
How long does an Octopus Cosy heat pump installation take?
Most residential installations complete in 1–2 days, in line with Greentech Renewables' standard renewable energy installation timeline, following an initial home survey to confirm suitability.
What makes the Octopus Cosy different from a standard heat pump?
The Cosy range uses the natural refrigerant R290, cutting heating-related carbon footprint by around 82% versus a gas boiler, and includes up to four wireless Cosy Pods — room sensors that monitor temperature and humidity for room-by-room control via the Octopus app. It's available in 6kW, 9kW and 15.5kW models to match different home sizes.
How do I get started with Greentech Renewables as my Octopus Cosy installer?
Book a free home assessment, either by calling 0333 577 7010 or requesting a quote online. Greentech will confirm BUS grant eligibility, survey your property, and set out the Cosy Octopus tariff savings in writing before you commit.
Book a Free Octopus Cosy Home Survey
We'll confirm BUS grant eligibility, size the correct Cosy unit for your property, and set out the Cosy Octopus tariff savings in writing before you commit.
