| Ambassador Engineers | 020 8423 8300 | | 26 Walton Avenue, Harrow, HA2 8QX |  Map & Directions |
| Fairdeal Heating Co | 020 8422 9600 | | 62 Lower Road, Harrow, HA2 0DH | | Map & Directions |
| Shepherd & James | 020 8429 4500 | | 112 Cambridge Road, Harrow, HA2 7LE | | Map & Directions |
| A P Builders & Plumbers | 020 8422 2145 | | 111 Carlyon Avenue , Harrow, HA2 8SN | | Map & Directions |
| Plumbing & Heating Direct | 020 7723 0505 | | Unit 13, Hailsham Drive, Waverley Industrial Estate, Harrow, HA1 4TR | | Map & Directions |
| Quality Heating | 01895 623574 | | 41 Eastcote Road , Ruislip, HA4 8BE | | Map & Directions |
| Peter Brown Plumbing & Heating | 020 8863 1155 | | Unit 3, 29-31 Frognal Avenue, Harrow, HA1 2SG | | Map & Directions |
| Arc Plumbing & Heating Services | 01923 821090 | | 86 Harrison Close, Northwood, HA6 2PN | | Map & Directions |
| M S Plumbing & Heating Services | 020 8907 8006 | | 93 Alicia Gardens, Harrow, HA3 8JD | | Map & Directions |
| Russell Black Ltd | 020 8907 7757 | | 399 Kenton Lane, Harrow, HA3 8RZ | | Map & Directions |
| A C Contractors Ltd | 020 8904 3502 | | 100 Sudbury Court Drive , Harrow, HA1 3TF | | Map & Directions |
| L H Plumbing & Heating Services Ltd | 020 8864 2311 | | 132 Vaughan Road, Harrow, HA1 4ED | | Map & Directions |
| Kiwi Drainage Ltd | 020 8908 9000 | | 44 Lulworth Avenue, Wembley, HA9 8TP | | Map & Directions |
| I S Cassidy | 020 8907 0701 | | 15 Willowcourt Avenue, Harrow, HA3 8ER | | Map & Directions |
| Metman Enterprises Ltd | 020 8907 1400 | | 291 Kenton Road, Harrow, HA3 0HQ | | Map & Directions |
| Heatsave Installations | 020 8903 8643 | | 10 Craigmuir Park, Wembley, HA0 1NY | | Map & Directions |
| Kevin Sheedy | 01895 632366 | | 32 Westholme Gardens, Ruislip, HA4 8QH | | Map & Directions |
| Heating Repairs Ltd | 07956 449602 | | 28 Mount Park Road, Pinner, HA5 2JR | | Map & Directions |
| Heat Solutions Ltd | 020 8426 2119 | | 212 Whitby Road, Ruislip, HA4 9DY | | Map & Directions |
| T Services | 020 8427 0342 | | Unit 1062, 1a Neptune Road, Harrow, HA1 4HY | | Map & Directions |
| Planvale Services | 0800 074 8394 | | 27 Edwards Avenue, Ruislip, HA4 6UP | | Map & Directions |
| A J Chapman & Son | 020 8428 4117 | | 11 Briants Close, Pinner, HA5 4SY | | Map & Directions |
| H S Contractors | 020 8795 0535 | | 1 Victoria Court, Wembley, HA9 6QJ | | Map & Directions |
| Ptp Services | 01923 827030 | | The Croft, Rickmansworth Road, Northwood, HA6 2RF | | Map & Directions |
| All-Ways Plumbing & Heating | 020 8952 5200 | | 111 Beverley Drive , Edgware, HA8 5NH | | Map & Directions |
| Jem Building Services | 020 8428 4318 | | 36 The Avenue, Hatch End, Pinner, HA5 4EY | | Map & Directions |
| Hallesy Services Ltd | 01895 674740 | | 105 Manor Way, Ruislip, HA4 8HW | | Map & Directions |
| R Davies Maintenance Ltd | 020 8423 2423 | | 130 Manor Way, Ruislip, HA4 8HR | | Map & Directions |
| T G A Plumbing Services | 01895 634582 | | 5 Cranley Drive, Ruislip, HA4 6BZ | | Map & Directions |
| G C P S Power Flushing | 07837 620953 | | Studio 44 Building 56, Magnet Road , East Lane Business Park , Wembley, HA9 7RG | | Map & Directions |
| Smith D W Plumbing & Heating | 020 8958 3868 | | 186 Broadfields Avenue, Edgware, HA8 8TF | | Map & Directions |
| Emery Installations | 020 8426 1224 | | 6 Birchmead Avenue, Pinner, HA5 2BG | | Map & Directions |
| Mahadev Heating Ltd | 020 8204 8221 | | 62 St. Pauls Avenue, Harrow, HA3 9PS | | Map & Directions |
| Brogan Plumbing Services | 07985 584889 | | 39 Montrose Avenue , Edgware, HA8 0DX | | Map & Directions |
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