Air valves for steam heating installations; Boilers for heating installations; Central heating radiators; Furnaces; Heating boilers; Heating furnaces; Heating systems composed primarily of tubes, pipes and manifolds through which warm or high temperature water circulates; Heating systems composed primarily of tubes, pipes and pre-assembled manifolds through which cold or low temperature water circulates; Heating systems for residential and commercial buildings comprised of biomass burners, boilers, valves, pipes, manifolds, solar panels, control panels, switches and electrical wire, all sold as a unit; Heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, control panel switches, and electrical wire, all sold as a unit; Heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, solar panels, control panel, switches and electrical wire, all sold as a unit; Heating units for industrial purposes; Heating boilers; Heating elements; Steam generating installations; Steam generators; Steam heating apparatus; Steam radiators for heating buildings; Steam superheaters; Automatic temperature regulators for central heating radiators; Boilers for heating installations; Economisers, namely, devices for warming feed water in heating boilers; Economisers, namely, devices for warming feed water in heating boilers; Electric boilers; Electric floor heating systems, namely, cables, electric mats and sensors for floor heating systems sold as a unit; Electric floor heating systems, namely, cables, electric mats and sensors for floor heating systems sold as a unit; Electrical boilers; Furnace boilers; Furnaces, other than for laboratory use; Heating boilers; Heating units for industrial purposes; Heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, control panel switches, and electrical wire, all sold as a unit; Heating systems for residential and commercial buildings comprised of biomass burners, boilers, valves, pipes, manifolds, solar panels, control panels, switches and electrical wire, all sold as a unit; Heating systems for residential and commercial buildings comprised of biomass burners, boilers, valves, pipes, manifolds, solar panels, control panels, switches and electrical wire, all sold as a unit; Heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, control panel switches, and electrical wire, all sold as a unit; Heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, solar panels, control panel, switches and electrical wire, all sold as a unit; Humidifiers for central heating radiators; Ignition systems comprised of a gas supply tube with a nozzle and an electrical igniter to create a flame at the nozzle for industrial applications, namely, for igniting waste gases being discharged from industrial stacks and for igniting gas-fired boilers; Indoor radiant heating systems; Indoor radiant heating systems; Industrial boilers; Pipes for heating boilers; Pipes for heating boilers