- B.G Heat
- 01495 740638 - Bryn Bungalow Usk Rd, Pontypool, Gwent, NP4 8AG
- CM Utilities
- 01656 746243 - Sturmi Wy Village Fm Indust Est, Pyle, Bridgend, Vale Of Glamorgan, CF33 6BZ
- Domestic Appliance Centre
- 01685 388877 - 14-15 Pontmorlais, Merthyr Tydfil, Vale Of Glamorgan, CF47 8UB
- Flame'N'Grate
- 01446 744788 - 99-100 High Street, Barry, Vale Of Glamorgan, CF62 7DS
- Power Service, The
- 01633 875249 - 62 Oaklands Vw, Greenmeadow, Cwmbran, Gwent, NP44 5EE
- Brisco Williams & Sons
- 01792 894961 - Gorseinon Road, Penllergaer, Swansea, Vale Of Glamorgan, SA4 9GG
- Cosihome
- 01554 835571 - 12 Dwynant, Furnace, Burry Port, Dyfed, SA16 0YQ
- D R Electrics
- 01792 419609 - 67 Eversley Road, Sketty, Swansea, Vale Of Glamorgan, SA2 9DE
- Gas Appliance Sales (Gas)
- 0845 2305020 - 42 Queens Road, Sketty, Swansea, Vale Of Glamorgan, SA2 0SB
- Gas Services Wales
- 01792 475100 - 16 Mansel Street, Swansea, Vale Of Glamorgan, SA1 5SG
- Gas Technical Services
- 01646 683845 - Unit 1 Llanion Cntr Llannion Pk Indust Est, Pembroke Dock, Dyfed, SA72 6TZ
- Gascare
- 01792 797900 - 2 Castle Graig, Morriston, Swansea, Vale Of Glamorgan, SA6 8NW
- B.G Lewis
- 01639 637026 - 15 Kestrel Close, Bryncoch, Neath, Vale Of Glamorgan, SA10 8DX
- Pembrokeshire Gas
- 01646 651111 - 16 Milton Meadows, Milton, Tenby, Dyfed, SA70 8PL
- Premier Gas Services
- 01558 668716 - Parc Amanwy, Ammanford, Dyfed, SA18 3EP
- Premier Gas Services
- 01792 897400 - 7 Clos-Glanlliw, Pontlliw, Swansea, Vale Of Glamorgan, SA4 9DW
- Premier Gas Services
- 01269 595850 - Parc Amanwy, Ammanford, Dyfed, SA18 3EP
- Somerset Gas Company, The
- 01643 709966 - 71 Parkhouse Road, Minehead, Somerset, TA24 8AE
- Jg Powner
- 07773 121443 - Brynhowel, Glandwr, Whitland, Dyfed, SA34 0UD
- Aber Plumbing
- 01495 291919 - 7 Brynteg Road, Abertillery, Gwent, NP13 3HN
- Gaspack Services
- 01443 844608 - CF37 5SX
- Wrc
- 01495 248454 - Fern Close, Pen-y-Fan Industrial Estate, Crumlin, Newport, Gwent, NP11 3EH
- Gas Services Network Ltd
- 01554 741041 - 87 Tyisha Road, Llanelli, Dyfed, SA15 1RP
- Chris Dupre
- 01983 401430 - 46 Victoria Road Sandown, Portsmouth, Hampshire, PO36 8AL
- Illuminate Technical Services
- 01443 772076 - 33 Windsor Street, Treorchy, Vale Of Glamorgan, CF42 6DG
- Pb Heating 7 Plumbing
- 01792 863899 - 15 Quarr Rd, Pontardawe, Swansea, SA8 4JD
- Rouch Bros
- 0845 1891890 - 7 Cwrt Aethen, BARRY, CF63 1HE
- The Gas Safety Co
- 0800 9554774 - 42 Stanwell Road, PENARTH, CF64 2EY
- DWJ Mechanical Ltd
- 0845 1840107 - D W J Mechanical Ltd 20a, Cardiff, CF14 1UA
- Affordable Gas Services
- 0800 3357571 - Cardiff
- Platinum Gas Services
- 0845 1840891 - 19 Mydam Lane Gorseinon, Swansea, SA4 4YA
- Warm Care
- 07989 133047 - 55 William Belcher Drive St. Mellons, Cardiff, CF3 0NZ
- Warm Care
- 07989 133047 - 55 William Belcher Drive St. Mellons, Cardiff, CF3 0NZ
- Rhondda Gas
- 0845 8157766 - 92 Tynybedw Terrace, Treorchy, CF42 6RL
- L P G Wales
- 0845 3473348 - Unit 3 Lamby Workshops Lamby Way, Cardiff, CF3 2EQ
- L P G Wales
- 0845 3473349 - Unit 3 Lamby Workshops Lamby Way, Cardiff, CF3 2EQ
- Central Heating Services Uk Ltd
- 01656 785650 - Glenavon Cres, Porthcawl, Bridgend, CF36 3LP