11 Apparatus for heating for air in buildings, cooling apparatus, steam generating apparatus for heating and industry, boilers, ventilation shunts for use in mixing hot and cold air, water purification apparatus, air-conditioning and sanitary apparatus being heat pumps, in buildings and parts for these devices, namely, heating installations, check valves, heating boilers, thermostats, control valves, electric radiators, heat accumulators; septic tanks; flow restrictors for reverse osmosis water purification units; pressure septic, waste water treatment tanks of metal; sewage treatment machines