What Is an Octopus Cosy Accredited Installer?
A plain-English explainer of the Octopus accreditation that sits on top of MCS — what it means, who has it in Greater Manchester, and why it matters for your install.
The short version
An Octopus Cosy Accredited Installer is a heating engineer authorised by Octopus Energy to design, install and commission 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.
What the accreditation actually requires
- Active MCS certification for air source heat pumps
- HIES or equivalent Consumer Code membership
- Engineers trained by Octopus on the Cosy range and refrigerant handling (R290)
- Documented commissioning standard, including flow temperature set-up, weather compensation, and Cosy Pod integration
- Warranty and first-year service commitment with Octopus
Why it matters vs "any" heat pump installer
The Cosy range uses natural refrigerant R290 and pairs with the Cosy Octopus tariff and Cosy Pods (wireless room sensors). Getting the best out of it depends on how it's commissioned — the flow temperature, weather compensation curve and hot water schedule. A Cosy Accredited Installer commissions to Octopus's own spec, which protects both the warranty and your day-one running cost.
Local Cosy Accredited Installer: Greentech Renewables
Greentech Renewables has held Octopus Cosy accreditation since 2026 and completed over 1,000 Cosy installations across Manchester, Salford, Stockport, Bury, Bolton, Oldham, Rochdale, Trafford, Tameside and Wigan. We handle the full journey — survey, BUS grant application, installation, and Cosy Octopus tariff hand-off.
Frequently Asked Questions
What is an Octopus Cosy Accredited Installer?
A heating engineer vetted and authorised by Octopus Energy to design, install and commission the Cosy heat pump range (6, 9 and 15.5kW) to Octopus's own installation standard — on top of MCS certification.
How is Cosy accreditation different from MCS certification?
MCS is the UK's baseline installer certification and is legally required to unlock the Boiler Upgrade Scheme grant. Cosy accreditation is an additional, brand-specific standard from Octopus Energy covering design decisions, commissioning quality, and post-installation handover for the Cosy range.
Is Greentech Renewables a Cosy Accredited Installer?
Yes. Greentech Renewables has been an Octopus Cosy Accredited Installer since 2026 and has completed over 1,000 Cosy installations across Greater Manchester and the North West.
Do I have to use a Cosy Accredited Installer to buy a Cosy heat pump?
In practice yes — the Cosy range is only fitted by installers authorised by Octopus. You can either book direct via Octopus's team or work with a local accredited installer such as Greentech Renewables, which lets you keep the BUS grant, warranty and Cosy Octopus tariff benefits with a local point of contact.
How do I verify an installer is Cosy accredited?
Ask the installer directly for their Octopus accreditation and cross-check that they hold MCS certification via the MCS installer database. Greentech Renewables displays both credentials and can provide accreditation reference details on request.
Does the Cosy accreditation cover servicing and warranty?
Yes. A Cosy Accredited Installer commissions the unit under warranty and handles first-year service and warranty claims direct with Octopus, so you don't lose warranty cover by using a local installer.
Book a Free Cosy Survey with an Accredited Installer
Greentech Renewables — Octopus Cosy Accredited since 2026 — will size, price and grant-fund your install.
