- Ballywilliam Plumbing & Heating
- 028 70354448 - 37 Killeague Road, Macosquin, Coleraine, County Londonderry, BT51 4NL
- Derry City Council Environmental Services
- 0800 512012 - Londonderry, County Londonderry, BT48 7AA
- 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
- North West Radiators
- 028 71268383 - 27a Bennett Street, Londonderry, County Londonderry, BT48 6SG
- S.A.C Plumbing & Heating Engineers
- Unit 3 Sperrin Vw Busines Pk Glen Rd, Coleraine, BT46 5LT
- TMC Gas Services
- 028 71813531 - Lynwood Bsns Cntr Campsie Indust Estate, Eglinton, Londonderry, County Londonderry, BT47 3XX
- Boiler Systems
- 028 71360800 - Unit 8 Northland Rd Indust Est, BT48 0LD
- T J Mcconnell & Sons
- 028 71363539 - 32 Balliniska Road, Londonderry, County Londonderry, BT48 0NA
- S.a.c Plumbing & Heating Engineers
- 028 79645525 - Unit 3, Sperrin Vw Busines Pk Glen Road, BT46 5LT
- S.a.c Plumbing & Heating Engineers
- 028 79644225 - Lisnamuck Road, Maghera, BT46 5LA
- James Conner Plumbing and Heating
- 028 29571699 - 107 Tamlaght Road Rasharkin, Ballymena, BT44 8RH
- Maiden City Sweep & Heating Services
- 028 71347447 - Lisnagelvin Rd, Londonderry, Co Londonderry, BT47 6DF