Heating installations, heating boilers, heating elements and structural parts therefor, heat cells sold as an integral part of condensing boilers; gas-water copper heat exchangers not being parts of machines; water-water stainless steel heat exchangers not being parts of machines; heat exchanger used for gas water heaters not being parts of machines, stainless steel plate heat exchangers not being parts of machines, thermostatic brass valves for heating installations
Environmental Control Apparatus