| CENTRAL HEATING By-Pass Valves | AALBERTS INTEGRATED PIPING SYSTEMS LIMITED |
| DANFOSS LTD |
| CENTRAL HEATING Control Valves | AALBERTS INTEGRATED PIPING SYSTEMS LIMITED |
| DANFOSS LTD |
| CENTRAL HEATING Electric Booster Units | DUNSLEY HEAT LTD |
| CENTRAL HEATING LPG Propane | CALOR GAS LTD |
| CENTRAL HEATING Motorised Valves | AALBERTS INTEGRATED PIPING SYSTEMS LIMITED |
| DANFOSS LTD |
| CENTRAL HEATING Multiple Boiler Linking Systems | DUNSLEY HEAT LTD |
| ESSE ENGINEERING LTD |
| CENTRAL HEATING Service Interval Programmers | TIMEGUARD - PROGRAMASTAT PLUS HEATING CONTROLS |
| CENTRAL HEATING Stoves | DUNSLEY HEAT LTD |
| ESSE ENGINEERING LTD |
| EUROSTOVE LTD |
| GDHV HEATING - GLEN DIMPLEX HEATING & VENTILATION |
| CENTRAL HEATING System | AALBERTS INTEGRATED PIPING SYSTEMS LIMITED |
| DUNSLEY HEAT LTD |
| ESSE ENGINEERING LTD |
| GEBERIT SALES LTD PIPING SYSTEMS |
| GEORGE FISCHER SALES LTD |
| Hep2O PUSH-FIT PLUMBING |
| REHAU BUILDING SOLUTIONS |
| UPONOR PLUMBING SOLUTION |
| WAVIN UNDERFLOOR HEATING & COOLING |
| CENTRAL HEATING Systems | DANFOSS LTD |
| DUNSLEY HEAT LTD |
| FLEXEL INTERNATIONAL LTD |
| GAIA CLIMATE SOLUTIONS LTD |
| GDHV HEATING - GLEN DIMPLEX HEATING & VENTILATION |
| Hep2O PUSH-FIT PLUMBING |
| REHAU BUILDING SOLUTIONS |
| VAILLANT LTD |
| VIESSMANN LTD |
| WAVIN UNDERFLOOR HEATING & COOLING |
| CENTRAL HEATING Valves | AALBERTS INTEGRATED PIPING SYSTEMS LIMITED |
| DANFOSS LTD |
| Hep2O PUSH-FIT PLUMBING |
| CENTRAL HEATING Wiring Accessories | DANFOSS LTD |
| MK ELECTRIC UK |
| CENTRAL HEATING Wiring Centres | AALBERTS INTEGRATED PIPING SYSTEMS LIMITED |
| CENTRAL HEATING Zone Valves | AALBERTS INTEGRATED PIPING SYSTEMS LIMITED |
| DANFOSS LTD |
