Heating apparatus, ventilation apparatus and water pipe apparatus, sanitary installations: wash basins, sinks, bathtubs, hip bathtubs, bidets, ventilation or de-aeration hoods, showers, water filters, air filters, water cocks, fittings, mixer water cocks, mixer fittings for water pipes, mouthpieces therefore, cocks and sliders for pipings, air conditioning apparatus, air heaters, draught regulators, draught sliders, chimney flues, chimney blowers, cleaning and check-up flaps for chimneys, check-up flaps and doors, storage and equalizing tanks for heating installations; water/rinsing cisterns for closets, closet cisterns, closet seats, closet rinsing devices; heat accumulators, heat pumps, heat recovering apparatus, heat exchangers, water softening installations, water systems, water distribution plants, water tap devices, central heating, boilers and control devices; regulating or controlling valves; central heating radiators; thermostat valves; ventilation fittings

Services of an engineering office for house and building engineering