| Aga | ACV | Alpha | Biasi | Ferroli |
| Glow-worm | Halstead | Ideal Stelrad | Interpart | Nabic |
| Ravenheat | Robur | Saunier Duval | Vaillant | Worcester |
| Powrmatic | Keston | Viessmann | Morco | Ariston |
| Chaffoteaux | Benson | Gledhill Cylinders | Johnson & Starley | Atag |
| Combat | Dunphy | Powrmax | B & Q | Kinder Fires |
| Lincat | Lennox | Elm Leblanc | Baxi | Santon |
| Andrews | Thorn | Argos | Sime | Format |
| Potterton | Burco Maxol | Beeston | Clyde Combustion | Colt |
| Crystal Fires | Eurotech Fires | Proserve | Rinnai | Reznor |
| Trident | Winter Warm | Protherm | Dunham Bush | Cochran |
| Eurocal | Mira | Weishaupt | Ocean | ICI Caldai |
| Flavel | Kinder | Parkinson Cowan | Myson | Main |
| Glen Dimplex | Cannon | Hamworthy | Drugasar | Sirocco Fires |
| Heatrae Sadia | Jaguar Spares | Liff | Numatic | Monoflame |
| Gazco | Valor | Vulcana | Creda | Focal Point |
| Redring | Biddle | Legend | Geminox | A.O.Smith |
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