- Abermaw Gas Heating
- 0870 7574481 - Fronheulog Gellfechan Rd, Barmouth, Gwynedd, LL42 1DE
- Flameright
- 01691 777784 - Westwood Holyhead Rd, Chirk, Wrexham, Clwyd, LL14 5NA
- K.M Grimley
- 01691 777325 - Tranmere, Halton, Chirk, Wrexham, Clwyd, LL14 5BG
- Town & Country Heating Supply
- 0870 8147739 - Mns Services, Pentre, Chirk, Wrexham, Clwyd, LL14 5AN
- A.J Pipeline Services
- 01248 724642 - Ty Newydd, Llangefni, Gwynedd, LL77 7YG
- Ash Heating
- 01352 741922 - Le Monte Cilcain Rd, Gwernaffield, Mold, Clwyd, CH7 5DJ
- Aston Jones
- 01978 856985 - Unit 10 Miners Pk Llay Indust Est, Llay, Wrexham, Clwyd, LL12 0PQ
- Border Gas North West
- 01978 855252 - 20 Mayflower Drive, Marford, Wrexham, Clwyd, LL12 8LD
- C & V Services Ltd
- 01352 751800 - Hanrhys House, Main Rd, Mold, Flintshire, CH7 6QW
- Calor Gas (Calor Gas Direct)
- 01248 450719 - 2d Glanydon Industrial Estate, Pwllheli, Gwynedd, LL53 5YT
- Clwyd Heating
- 01745 361636 - 36a Tynewydd Road, Rhyl, Clwyd, LL18 3SP
- Crescent Services
- 01745 825335 - 6 Dundonald Avenue, Abergele, Clwyd, LL22 7SP
- Cumbria Heating Components
- 01978 363777 - Wrexham Auto Elect Rivulet Rd, Wrexham, Clwyd, LL13 8DT
- Cumbrian Heating Components
- 01978 363444 - Rivulet Road, Wrexham, Clwyd, LL13 8DT
- Delyn Hire
- 01244 812888 - Queens Lane, Bromfield Industrial Estate, Mold, Clwyd, CH7 1XB
- P & L Denney
- 01745 890204 - Ty Gwyn, Llanynys, Denbigh, Clwyd, LL16 4LH
- R.T Downs
- 01352 744908 - Unit 1 Mold Bsns Pk Maes Gwern, Mold, Clwyd, CH7 1XP
- James Edwards
- 01978 841802 - Bryn Gwyn Fennant Rd, Ponciau, Wrexham, Clwyd, LL14 1PG
- Fireprotect
- 01244 536595 - Factory Rd, Sandycroft, Deeside, Clwyd, CH5 2QL
- T.J Fixit
- 01286 676858 - Eisteddfa, North Road, Caernarfon, Gwynedd, LL55 1BE
- Flamerite
- 01492 573355 - Unit 7/8 Llandudno Jcn Indust Est, Llandudno Junction, Gwynedd, LL31 9SX
- L Gardner
- 01248 853777 - 108 Lon Penmon, Benllech, Tyn-y-Gongl, Gwynedd, LL74 8RR
- Gas Care Central Heating
- 01248 372442 - Llandygai, Bangor, Gwynedd, LL57 4YH
- Gas Services Direct
- 01492 592473 - 1 Deganwy Road, Deganwy, Conwy, Gwynedd, LL31 9DH
- Griffiths
- 01244 537800 - Hawarden Bsns Pk Clwyd Clo Manor La, Hawarden Industrial Park, Hawarden, Deeside, Clwyd, CH5 3PZ
- Gwespyr Heating
- 01745 856562 - Westhill Llanasa Rd, Gwespyr, Holywell, Clwyd, CH8 9JS
- George S Hall
- 01407 742408 - Portacabin RAF Valley, Valley, Holyhead, Gwynedd, LL65 3NY
- Heating Services
- 01492 580257 - Wheatsheaf Bldgs Glan Conwy, Glan Conwy, Colwyn Bay, Clwyd, LL28 5SS
- Hopol
- 01492 536676 - 4a Rhiw Road, Colwyn Bay, Clwyd, LL29 7TE
- Hydro-Tech Heating
- 01352 754265 - Tyn Y Cae Ruthin Rd, Gwernymynydd, Mold, Clwyd, CH7 5LG
- Industrial Gas Services
- 01244 813426 - Bumble Bee Gar Church St, Connah's Quay, Deeside, Clwyd, CH5 4AR
- J R S Mechanical Services Ltd
- 01978 753676 - Unit 33, Five Crosses Industrial Estate, Minera, Wrexham, Clwyd, LL11 3RD
- Brian Jones
- 01766 762788 - Y Wenllys, Ffestiniog, Blaenau Ffestiniog, Gwynedd, LL41 4LH
- David F Jones
- 01492 580774 - Brynawel Craig, Graig, Glan Conwy, Colwyn Bay, Clwyd, LL28 5TW
- J.W Jones & Son
- 01492 531414 - 3-5 Bay View Rd Colwyn Bay, Clwyd, LL29 8DW
- W.G Jones
- 01758 740457 - Bryn Goleu, Llanbedrog, Pwllheli, Gwynedd, LL53 7NU
- Kiwi Supplies
- 01244 543513 - Woodlands Alltami Rd, Alltami, Mold, Clwyd, CH7 6LG
- Margden Plumbing & Heating Engineers
- 01244 548018 - The Croft Alltami Rd, Buckley, Clwyd, CH7 3PG
- Marval Heating
- 01492 547766 - 123 Penrhyn Avenue, Rhos On Sea, Colwyn Bay, Clwyd, LL28 4LG
- S.A Maybury
- 01244 550561 - 12 Delamere Avenue, Buckley, Clwyd, CH7 3BU
- MJR Bathrooms Gas & Heating Installations
- 01824 705908 - Unit 11 Lon Parcwr Bsns Pk, Ruthin, Clwyd, LL15 1NJ
- Morton Services
- 01758 612800 - 2d Glanydon Industrial Estate, Pwllheli, Gwynedd, LL53 5YT
- Oakmere Plumbing
- 01286 674610 - 9 St. Helens Road, Caernarfon, Gwynedd, LL55 2YD
- I Parry
- 01248 853742 - Gwel Y Don, Marianglas, Gwynedd, LL73 8PA
- Power Services, The
- 01286 676727 - Caegarw Llanberis Rd, Caernarfon, Gwynedd, LL55 2DF
- Profile Services
- 01248 670450 - Y Felinheli, Gwynedd, LL56 4JR
- Quay Home Heating
- 01244 812517 - 116 High Street, Connah's Quay, Deeside, Clwyd, CH5 4DF
- J.F Sherwin
- 01978 840258 - Bryn Vw Afoneitha Rd, Penycae, Wrexham, Clwyd, LL14 2DH
- D Shorney
- 01407 740831 - Ewyn Y Don Maes Alaw, Valley, Holyhead, Gwynedd, LL65 3BA
- Spencers Plumbing & Heating Supplies Ltd
- 01244 813470 - 7 Nelson Street, Shotton, Deeside, Clwyd, CH5 1DH
- Taylor & Jones Plumbing & Heating
- 01407 760555 - 13 Rhos Y Gaer Avenue, Holyhead, Gwynedd, LL65 2BE
- Town & Country Heating Supply
- 01978 823242 - Park Road, Rhosymedre, Wrexham, Clwyd, LL14 3AX
- Turkington Engineering
- 01978 363048 - Unit 12, Whitegate Industrial Estate, Whitegate Road, Wrexham, Clwyd, LL13 8UG
- A.G Twitchett
- 01286 881442 - 56 Bryn-Celyn Rd, Talysarn, Caernarfon, Gwynedd, LL54 6AB
- G.T Wilson
- 01978 861118 - 3 Arosfa Crescent, Llangollen, Clwyd, LL20 7PW
- Neataheat
- 0845 8064822 - 15 Maesteg Gwynfryn, Wrexham, LL11 5YU
- Heat Care North West
- 01978 755945 - 5 Y Berllan, Coedpoeth, Wrexham, LL11 3UQ
- Corr Gas Services
- 01352 761572 - 56 Min Awel, Flint, Clwyd, CH6 5TG
- Cadnant Plumbing & Heating
- 01248 717169 - 9 Mill Lodge Estate, Llandegfan, Menai Bridge, Gwynedd, LL59 5YB
- Fueltech Gas and Oil Boiler Services
- 01824 709537 - The Bungalow, Upper Clwyd St, Ruthin, Denbighshire, LL15 1HY
- Ggs Heating Services
- 01745 814682 - Colomendy Indust Est Rhyl Rd, LL16 5TA
- Heating Economy
- 01978 754466 - Valkyrie Heol Llewelyn, Wrexham, Wrexham, LL11 3PB
- E.b.m Heating Services
- 01352 733000 - Gwelfor Tyddyn Messham, Bagillt, CH6 6DG
- Astbury Heating
- 01248 372400 - Penybont, Treborth, Gwynedd, LL57 2NX
- P.M Norman
- 01829 270158 - Whitegates Green St, Holt, Wrexham, Clwyd, LL13 9JF
- Foelas Heating
- 08448 006845 - Gors Nug, Pentrefoelas, Betws-y-Coed, Gwynedd, LL24 0TF
- Colwyn Fireplace Centre Ltd
- 01492 540033 - Bron Y Nant, Colwyn Bay, Clwyd, LL28 4YL
- Heating & Technical Services
- 01745 826344 - Unit 4a, Station Business Park, Pensarn, Abergele, Clwyd, LL22 7PX
- Alcock Heating Services
- 01745 730766 - 3 Clwydian Pk Vw, St. Asaph, LL17 0BX
- J & E Evans
- 01341 247617 - Doigau Gwynedd, Dyffryn Ardudwy, LL44 2RQ
- G P Davies Gas Services
- 0845 8061664 - 94a Brunswick Road Buckley, Clwyd, Flintshire, CH7 2ER
- S & J Plumbing and Heating
- 0845 4916923 - 32 Cambrian Walk, Rhyl, Denbigshire
- Worthingtons Plumbing Services
- 07708 616696 - 8 Queens Park Holyhead, Gwynedd, LL65 1PP
- Dew Plumbing and Heating
- 07789 968427 - 17 Manod Road, Blaenau Ffestiniog, Gwynedd, LL41 4DE
- Monument Gas
- 0845 2632127 - Spion Kop Chapel Street, Penysarn, Gwynedd, LL69 9YE
- Tony Howard Heating and Plumbing
- 0845 2632219 - Waen Fawr Pentre Celyn, Ruthin, Clwyn, LL15 2HW
- Llanfair Gas Services
- 0845 2634096 - Gwynllys Park Crescent, Llanfairechan, Gwynedd, LL33 0BA
- RW McKenzie
- 07748 268149 - 1 Cross Field Road Greenfield, Hollywell, CH8 7JB
- Norton Plumbing And Heating
- 01978 761843 - 3 Sunny Bank, Cefn Y Bedd, Wrexham, LL12 9YN
- Gaslec Technical Services Limited
- 01341 247973 - Brif Heol, Dyffryn Ardudwy, Gwynedd, LL44 2DG
- Wood The Gas Man
- 07729 149584 - 75 Daneside Park Holmes Chapel Road, CHESHIRE, CW12 4SL
- Lawton Heating & Plumbing
- 01286 678861 - 10 Glanffynnon Rd, Cearnarfon, Gwynedd, LL55 4PS
- Eddie Barker Services
- 0845 5435075 - 27 Maenan, Colwyn Bay, LL29 9BA
- Eddie Barker Services
- 0845 0991099 - 27 Maenan, Colwyn Bay, LL29 9BA
- Ian Tait Plumbing & Heating
- 01745 342863 - 29 Derwen Drive, Rhyl, Denbighshire, LL18 2PB
- Eryri Building Services
- 01492 546633 - Unit 7 Phoenix Workshops, Mochdre, Conwy, LL28 5EF
- Am Plumbing And Heating
- 01978 365461 - 5 Trem-y-llyn, Wrexham, Wrecsam, LL11 3BX
- Psp Plumbing & Heating
- 07753 820155 - Langholme Halkyn, Mold, Flintshire, CH8 8DL