- Borehole
- A deep vertical hole holding part of a ground loop where land is limited. More
- Boiler Upgrade Scheme
- The government grant that takes a fixed sum off an installer's quote for a heat pump; the installer applies. More
- Capped or clamped meter
- A gas meter that has been disconnected or locked; for the higher grant band it still counts as mains gas. More
- Class C
- The permitted development rule for ground source heat pumps within a home's grounds. More
- Class D
- The permitted development rule for water source heat pumps. More
- Class G
- The permitted development rule for air source heat pumps, with size, number, position and sound conditions. More
- Consortium
- The three councils that deliver the Warm Homes: Local Grant together, managed by Cheshire East. More
- EPC
- Energy Performance Certificate, rating a home A to G; the consortium grant is for homes rated D, E, F or G. More
- Ground loop
- Pipe buried in trenches or boreholes, carrying fluid that collects heat from the ground. More
- Higher grant band
- £9,000 for an air or ground source heat pump replacing oil or LPG in a home with no mains gas, to 31 March 2027. More
- LPG
- Liquefied petroleum gas, delivered by tanker to a tank or in bottles; common in homes off the gas main. More
- Off-gas grid
- Not connected to mains gas; for the grant, defined precisely by Ofgem. More
- Park home
- A residential mobile home on a licensed site; census counts them with caravans. More
- Permitted development
- Work that has planning permission granted in advance by national order, subject to conditions. More
- Warm Homes: Local Grant
- Government funding delivered by councils for lower-income households in less efficient homes. More
Two terms people mix up
"Off the gas grid" in everyday speech means a home with no gas supply. For the higher grant band the meaning is narrower: Ofgem treats a home with a capped or clamped gas meter as on mains gas, even if gas has not been used for years. And "installer" in this site's name describes what people search for; the site itself is a guide, not an installer.