Lighting apparatus, namely, lighting installations; electric water boilers; cooling installations for water; air-conditioning installations; gas scrubbing apparatus; electric air dryers; air filtering installations; air sterilizers; heat pumps; heating installations; heaters for baths; air-source heat pump water heaters; water purifying apparatus and machines; sewage disposal plants; water purification installations; disinfectant apparatus; filters for drinking water; water softening apparatu...