| Mayne Gas Heating Limited, E5 The Enterprise Village, Prince Albert, DN31 3AT |
| TAL Plumbing and Heating, Grimsby, DN32 0EZ |
| Steve Jones Plumbing and Heating, Cleethorpes , DN35 7HE |
| M2O Plumbing, Doncaster, DN31 2TP |
| Pro Plumb Ltd, Cleethorpes, DN35 9ER |
| Total Heating Solutions, Grimsby, DN33 3SJ |
| Denis Thorpe P & H Services, Grimsby, DN36 4AY |
| C D Plumbing & Heating Solutions, Grimsby , DN36 4YE |
| Eco Heating Engineers Ltd, Grimsby, DN36 4UW |
| ESL Grimsby Limited, Grimsby , DN37 7WA |
| Leisure Gas Services, , DN36 5YG |
| TC Heating, Tetney, DN36 5LZ |
| MSC Plumbing & Heating Specialist, Grimsby, DN36 5SX |
| Steven Richardson Plumbing, Hull, HU12 9PN |
| A Shaw Plumbing & Heating, Barnetby, DN38 6AH |
| District Heat, North Somercotes , LN11 7PS |
| All Things Gas Limited, Withernsea, HU19 2DW |
| Gas Solve Ltd, , LN11 0UZ |
| GGS, Lincolnshire, LN11 9BX |
| Advanced Gas Services (East Yorkshire) Limited, Hotham Street, Hull, North Humberside, HU9 1RD |
