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Gas, water, plumbing, heating, ventilation and air conditioning (HVAC) plant installation ...

Gas appliance installation contractors (1)	Boiler installation contractors (5)
Fireplace and stove installation contractors (1)	Oil tank installation contractors
Ventilation duct installation contractors (1)	Gas and water mains installation contractors
Hot water installation contractors, legionella protected systems for public buildings (2)	Cold water system installation contractors (1)
Space heating installation contractors, radiant, hot air and gas (1)	Electric heating installation contractors
Hothouse heating plant installation contractors	Water lifting equipment for buildings, installation contractors (1)
Plumbing installation contractors, industrial (1)	Solar energy panel installation contractors (3)
Heat pump installation contractors (23)	Trace heating contractors
Pipework and plumbing installation contractors, marine (56)	Plumbing and sanitary installation and repair contractors, domestic (66)
Central heating system installation, maintenance and repair contractors	Refrigeration plant and equipment installation, maintenance and repair contractors (2)
Air conditioning installation, operation, maintenance and repair contractors (2)	Hot water system installation, maintenance and repair contractors (3)
Gas system installation, maintenance and repair contractors (1)	Ventilation plant installation, maintenance and repair contractors (1)
Conversion services, industrial gas powered equipment to natural gas	Leakage detection and location services, pipelines (1)
Remote monitoring contractors for refrigeration plant (1)	Dust extraction systems, design, installation and maintenance (56)
Maintenance and reconditioning services, sanitary and heating equipment (1)	Repair and maintenance services for fuel oil central heating systems (1)
Resurfacing services, in situ, for baths and sanitary ware	Gas, water and heating installation inspection and maintenance services (3)