- The Boiler Clinic
- 0191 2742876 - 10-12 Heighley St Newcastle Upon Tyne, Tyne And Wear
- Hurlstone and Champ Ltd
- 01782 626575 - 95 High Street Silverdale, Staffordshire, ST5 6LY
- Ridwell
- 01248 602182 - 1 Bangor Road, Groomsport, Bangor, County Down, BT19 6JF
- A K S Plumbing & Heating
- 028 91821919 - Newtownards, BT23 4II
- Abbey Real Estates
- 028 93323136 - 52 Main Street, Ballyclare, County Antrim, BT39 9AA
- Abbott Boiler & Heating Services
- 028 90618444 - 49 Glenhead Avenue, Dunmurry, Belfast, County Antrim, BT17 9AX
- Action Plumbing & Heating
- 028 90610944 - 73 Stewartstown Park, Belfast, County Antrim, BT11 9GJ
- Ad Plumbing & Heating
- 028 90611191 - Unit 27a, Springbank Industrial Estate, Pembroke Loop Road, Dunmurry, Belfast, County Antrim, BT17 0QL
- All Spares Heating Supplies
- 028 91817915 - 60 Frances Street, Newtownards, County Down, BT23 7DY
- Armstrong Heating & Plumbing
- 028 92676875 - 113 Saintfield Road, Lisburn, County Antrim, BT27 5PA
- Ballyearl Heating & Plumbing
- 028 93352652 - 7 Ballybracken Road, Ballyclare, County Antrim, BT39 9QZ
- Ballywilliam Plumbing & Heating
- 028 70354448 - 37 Killeague Road, Macosquin, Coleraine, County Londonderry, BT51 4NL
- Boiler & Heating Solutions
- 0800 7839764 - 67 Valley Business Centre, Church Road, Newtownabbey, County Antrim, BT36 7LS
- Brownlow Radiators
- 028 38324382 - 1 Wenlock Road, Lurgan, Craigavon, County Armagh, BT66 8QR
- John Byrne
- 028 41754064 - 6 Lazy Hl, Warrenpoint, Newry, County Down, BT34 3GB
- C & F Heating & Plumbing
- 028 90403389 - 5 Garland Park, Belfast, County Antrim, BT8 6YN
- C & F Heating & Plumbing
- 028 90403389 - Belfast, BT8 4YN
- Knockbracken Fuels
- 028 90812733 - 19 Knockbracken Dv, Belfast, BT8 8EX
- Corry (Plumbing & Heating)
- 028 87726952 - 1001 Shore Road, Belfast, County Antrim, BT15 4HR
- P J Heating Ltd
- 028 90782755 - 1001 Shore Road, Newtownabbey, County Antrim, BT36 7DE
- Curran Heating & Plumbing
- 028 90603130 - 112 Trench Park, Belfast, County Antrim, BT11 9FG
- D H Plumbing & Heating
- 028 90860124 - 25 Sycamore Drive, Newtownabbey, County Antrim, BT37 0PA
- E Davidson
- 028 40622836 - Scarva Rd Ind Est Scarva Rd, Banbridge, County Down, BT32 3QD
- Derry City Council Environmental Services
- 0800 512012 - Londonderry, County Londonderry, BT48 7AA
- Dundonald Plumbing and Heating
- 028 91459294 - 31 Brianville Park Bangor, Co. Down, BT19 6DZ
- Evans Brothers
- 028 90410354 - 4 Cumberland Court, Dundonald, Belfast, County Antrim, BT16 2AP
- United Boiler Services
- 028 90457501 - 111 Airport Rd Wst, Belfast, County Antrim, BT3 9ED
- George Nelson Plumbing & Heating Ltd
- 028 90502800 - 43a Tates Avenue, Belfast, County Antrim, BT9 7BY
- Handley Heating Services
- 028 92693588 - 30 Edenordinary Road, Banbridge, County Down, BT32 4HA
- Handley Heating Services
- 028 92699955 - Banbridge, County Down, BT32 4HA
- Handley Heating Services
- 028 94454033 - Aldergrove, Crumlin, BT29 3HU
- Harris Heating & Plumbing Supplies
- 028 90551720 - Valley Bus Cntr, 67 Church Rd, Newtownabbey, County Antrim, BT36 7LS
- Knox
- 028 92693636 - 30 Killysorrell Road, Dromore, County Down, BT25 1LA
- Lecale Plumbing & Heating
- 028 44842001 - 15 Crossmore Road, Ardglass, Downpatrick, County Down, BT30 7TA
- Newtownabbey Boiler Services
- 028 90852999 - 15 Sherwood Avenue, Newtownabbey, County Antrim, BT36 5GF
- McBurney Heating & Plumbing
- 028 25891613 - 119b Fernisky Rd, Antrim, County Antrim, BT41 2JX
- McCandless Bathrooms Plumbing & Heating
- 028 70344422 - Loguestown Industrial Estate, Coleraine, County Londonderry, BT52 2NS
- McCandless Bathrooms Plumbing & Heating
- 028 70343196 - Coleraine, County Londonderry, BT52 2NS
- McIntyre Plumbing & Heating
- 028 91810982 - 25 The Willows, Newtownards, County Down, BT23 8FJ
- Magma Underfloor Heating
- 028 86762931 - 29 Killymoon Street, Cookstown, County Tyrone, BT80 8JZ
- Maxwell Lyons
- 028 30267412 - Unit 4 Greenbank Business Centre, Greenbank Industrial Estate, Newry, County Down, BT34 2QX
- Mid Ulster Heating Services-
- 028 85557105 - 40 Castletown Road, Dungannon, County Tyrone, BT70 1SN
- Mid Ulster Heating Services-
- 07860 422071 - Dungannon, County Tyrone, BT70 1TW
- North West Radiators
- 028 71268383 - 27a Bennett Street, Londonderry, County Londonderry, BT48 6SG
- Paul Darby Plumbing & Heating
- 028 90551885 - Valley Business Centre, Church Road, Newtownabbey, County Antrim, BT36 7LS
- The Radiator Shop
- 028 91815991 - Unit 1 Scabro Business Park, Newtownards, BT23 4YH
- Paul Robinson
- 028 90798452 - 59a Kensington Road, Belfast, County Antrim, BT5 6NL
- S.A.C Plumbing & Heating Engineers
- Unit 3 Sperrin Vw Busines Pk Glen Rd, Coleraine, BT46 5LT
- Taylor Heating
- 028 90484922 - Unit C17, Dundonald Enterprise Park, Carrowreagh Road, Dundonald, Belfast, County Antrim, BT16 1QT
- Tec Heating Controls
- 028 79650466 - 2 Brecart Road, Toomebridge, Antrim, County Antrim, BT41 3TH
- Tec Heating Controls
- 028 79659501 - Toomebridge, Antrim, County Antrim, BT41 3SF
- H Thompson
- 028 90844103 - 19 Cherryvale Avenue, Newtownabbey, County Antrim, BT36 7UG
- Warmfloor Heating Ireland
- 028 82259515 - Omagh, County Tyrone, BT78 5EJ
- Warmflow Engineering
- 028 92621515 - Lissue Indust Est Moira Rd, Lisburn, BT28 2RB
- Willis Heating & Plumbing
- 028 90781236 - Unit 28, Somerton Indust Pk Dargan Cres, Belfast, County Antrim, BT3 9JP
- Willow Heating & Plumbing
- 028 90370375 - 19 Grasmere Gardens, Belfast, County Antrim, BT15 5EG
- A1 Domestic Boiler Services
- 028 97561363 - 12 Piney Hill, Ballynahinch, Down, BT24 8RB
- Boiler Systems
- 028 71360800 - Unit 8 Northland Rd Indust Est, BT48 0LD
- William Mcallen & Sons Ltd
- 028 43723306 - 33 Bryansford Gardens, Newcastle, County Down, BT33 0EQ
- Alternative Heat
- Station Road, Castlewellan, County Down, BT31 9NF
- Bros Devlin
- 028 79650401 - Toomebridge, Antrim, County Antrim, BT41 3NT
- Warmfloor Heating Ireland
- 028 87729009 - Beech Valley Wy Ballygawley Rd, Bt70, BT70 1BS
- N I Gas & Heating
- 028 38830999 - 11 Scarvagh Locks, Scarva, Craigavon, County Armagh, BT63 6NB
- Fusion Heating
- 028 44821777 - 20 Shore Road, Killyleagh, Downpatrick, County Down, BT30 9UE
- Huston Heating
- 0800 7839076 - 23 Ballysculty Road, Muckamore, County Antrim, BT41 4QU
- Mchugh Plumbing & Heating Contracts
- 028 80757505 - 100 Church Road, Beragh, Sixmilecross, Omagh, County Tyrone, BT79 0SA
- Mn Plumbing & Heating
- 028 30860022 - Supervalu Complex Newry Rd, County Down, BT35 9BN
- Allan Greenfield Boiler Maintenance
- 028 92603730 - 16 Thornhill Ave, Lisburn, Antrim, BT28 3EE
- Kh Boiler Services
- 028 38329995 - 10, Glenbrook Cotts, BT66 8QT
- S.a.c Plumbing & Heating Engineers
- 028 79645525 - Unit 3, Sperrin Vw Busines Pk Glen Road, BT46 5LT
- I-fix Plumbing & Heating Services
- 028 25861233 - 43 Braidwater Gardens, Broughshane, Ballymena, County Antrim, BT42 4LA
- S.a.c Plumbing & Heating Engineers
- 028 79644225 - Lisnamuck Road, Maghera, BT46 5LA
- M & A Plumbing & Heating
- 0845 8324158 - 15 Ballybriest Road, Cookstown
- James Conner Plumbing and Heating
- 028 29571699 - 107 Tamlaght Road Rasharkin, Ballymena, BT44 8RH
- Mourneview Plumbing And Heating
- 07740 857440 - 1 Tullybrannigan Walk Newcastle, County Down, BT33 0TX
- Tower Sweep
- 0845 4917405 - 40 Loughan Hill Carniny Road, Ballymena, County Antrim, BT43 5LR
- C Toman Plumbing and Heating
- 07703 343543 - Unit 27 Workwest 301 Glen Road, Andersontown, Belfast, BT11 8BU
- Valueoils
- 09058 890100 - 54 Mallusk Road, Newtownabbey, Antrim, BT36 4PX
- SP Plumbing
- 0845 8066499 - 11 Blenheim Park Carryduff, Belfast, County Antrim, BT8 8NN
- JR Waddell & Son Ltd
- 0845 8067271 - 30 Tunnell Road, Newry, County Down, BT35 6LS
- H S Mechanical Services
- 028 90868077 - 12 Glenview Crescent, Newtownabbey, Antrim, BT37 0TW
- Straid Ahead
- 0845 2635265 - 49 Seskin Road Straid, Ballyclare, Antrim, BT39 9NG
- Maineview Boilers
- 0845 2635340 - 53 Coolsythe Walk Randalstown, Antrim, BT41 3EB
- Hi-Qual Plumbing
- 0845 6834372 - 20 Empire Street, Belfast, County Antrim, BT12 6GJ
- Robert Bunting Plumbing and Heating
- 0845 6834724 - 14 Ravara Dale Ballygowan, Newtownards, County Down, BT23 6HP
- Robert Bunting Plumbing and Heating
- 028 97521863 - 14 Ravara Dale Ballygowan, Newtownards, County Down, BT23 6HP
- PH Gas Services and Heritage Plumbing
- 07928 751038 - 11 Oeghill Hill Park Drumahoe, Londonderry, County Londonderry, BT47 3HN
- AJ Boiler and Cooker Services
- 0845 6836179 - 14 Muskett Ave, Carryduff, Belfast, BT8 8QH
- E O'Rourke & Son Ltd
- 0845 8392085 - 5 Mountain View Castlewellan, Castlewellan, County Down, BT31 9SG
- Michael Turley Heating and Plumbing Services
- 0845 4817834 - 51 Collinward Avenue, Newtownabbey, County Antrim, BT36 6DY
- Maiden City Sweep & Heating Services
- 028 71347447 - Lisnagelvin Rd, Londonderry, Co Londonderry, BT47 6DF
- Nutech Renewables Ltd
- 028 41753031 - Unit 11, Warrenpoint Enterprise Centre, Newry Rd, Warrenpoint, Down, BT34 3LA
- Pcm Plumbing & Heating
- 028 30889742 - 48 New Road, Silverbridge, Armagh, BT35 9NB
- KH Boiler Services Ltd
- 0845 2502799 - 3b Bluestone Business Park Moyraverty West Road, Craigavon, BT65 5HU
- J L Services
- 0845 3475113 - 21 Edenmore Court, Newtownabbey, Northern Ireland, BT37 0ZA
- Lough Shore Plumbing and Electrical
- 0845 3475677 - 18 Back Lower Road Killycolpy, Dungannon, Northern Ireland, BT71 5ER