6
Water pipes and accessories of metal
11
Heating installations; Gas fired heating installations; Oil fired heaters; Combined heating and air conditioning apparatus; HVAC systems (heating, ventilation and air conditioning); Solid-fuel heating systems; Heat pumps; Solar thermal installations; Heat regenerators; Water filtering installations; Sanitary installations; Sanitary installations; Sanitary water fittings
19
Water pipes and accessories, not of metal; Drain pipes
37
Construction services; Construction services; Installation, commission, maintenance and repair of electrical installations for buildings, photovoltaic installations, monitoring, control and regulating equipment for automation of buildings, shading systems, heating systems, gas heating systems, oil heating systems, solid-fuel heating systems, hot air pumps, hot water pumps, geothermal pumps, solar thermal installations, air conditioning installations, ventilating installations, heat recovery systems, sanitary facilities and bathroom fittings for buildings
42
Technical consultancy relating to building technology, including energy supply, thermal technology, refrigerating technology, heating technology, gas heating systems, oil heating systems, solid-fuel heating systems, air heating pumps, water heating pumps, geothermal heat pumps, solar thermal installations, air conditioning installations, ventilating installations, heat recovery systems, sanitation technology and bathroom fittings; Technical design in relation to building technology, including energy supply, thermal technology, refrigerating technology, heating technology, gas heating systems, oil heating systems, solid-fuel heating systems, air heating pumps, water heating pumps, geothermal heat pumps, solar thermal installations, air conditioning installations, ventilating installations, heat recovery systems, sanitation technology and bathroom fittings