- Gas-Elec Safety Systems
- 01287 201001 - 2 Old Brew House, Bow Street, Guisborough, Cleveland, TS14 6PR
- Kevin Ralston
- 01287 643704 - 22 St. Cuthberts Walk, Liverton, Saltburn-by-the-Sea, Cleveland, TS13 4QL
- M.R Anderson
- 01757 708904 - 4 Larkfield Road, Selby, North Yorkshire, YO8 9AS
- H B Dobson (Gas) Ltd
- 01423 564131 - 37-39 Tower Street, Harrogate, North Yorkshire, HG1 1HS
- Natural Gas Services
- 01723 586203 - Seamer Ct Hopper Hl Rd, Scarborough, YO11 3YP
- Gas Maintenance Services
- 01423 860906 - Monkswell Ho Manse La, Knaresborough, North Yorkshire, HG5 8NQ
- The Heating People Ltd
- 01723 518327 - Unit 2, The Brigg, Station Avenue, Filey, North Yorkshire, YO14 9AQ
- C & A Wilson
- 01642 487317 - Unit C, Limerick Road, Redcar, Cleveland, TS10 5JU
- Heating Plumbing Gas
- 01423 566702 - Oakbeck House Electric Avenue, Harrogate, HG1 2BB
- Gas-tech
- 01423 548463 - 13 Grimbald Road, Knaresborough, North Yorkshire, HG5 8HD
- Gas Magic
- 01642 299880 - 30 Spencer Road, Middlesbrough, Cleveland, TS6 9BH
- Gas Magic
- 01642 299880 - 30 Spencer Road, Middlesbrough, Cleveland, TS6 9BH
- C & A Wilson Plumbing & Heating Ltd
- 01642 487309 - Unit C Limerick Road, Redcar, North Yorkshire, TS10 5JU
- All Aspect Gas Services
- 01423 540799 - Over Nidd, Harrogate, North Yorkshire, HG1 3DB
- Wharfedale Plumbing And Heating
- 0845 8393474 - Hiver Cottage Pateley Bridge Road, Harrogate, HG3 3EG
- O'garas Plumbing & Heating
- 01642 279629 - 83 Chalford Oaks, Middlesbrough, Cleveland, TS5 8QQ
- Ad Gas Heating & Plumbing Services
- 01423 550770 - 8-10 South Park Road, Harrogate, North Yorkshire, HG1 5QU
- Trevor Hill Plumbing and Heating
- 0845 4917304 - 33 Wilton Green, Middlesbrough, TS6 8DP