| Bengco | Hampshire |
| www.bengco.co.uk | |
| Dowling Stoves | Dumfries |
| www.dowlingstoves.com | |
| Eberspacher UK Ltd. | Hampshire |
| www.eberspacher.com | |
| Harworth Heating | South Yorkshire |
| www.oilstoves.co.uk | |
| Lockgate Oil Stoves Ltd. | Nottinghamshire |
| www.lockgate-stoves.co.uk | |
| Seath Automarine Systems | Norfolk |
| www.seathsystems.co.uk | |
| Sowester Simpson-Lawrence Ltd. | Dorset |
| www.sowester.com | |
| Webasto Thermosystems UK Ltd. | Yorkshire |
| www.webasto.de | |