E

Heat exchangers being parts of machines

Water heater controls, boiler control instruments, boiler valve controller; electronic gateways for communication interface with HVAC automation systems; boiler management systems comprised of computer hardware, software, and controllers; isolation valve controller for boilers and electronic control units for water heater and boiler systems

Water heaters for domestic, commercial and industrial use, tankless water heaters, heating boilers, pipes for heating boilers, direct vents for gas water heaters and boilers, heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, control panel, switches and electrical wire, all sold as a unit; water heating systems comprised of domestic water storage tanks, buffer tanks, steam traps, water pumps, and air filters

Maintenance and servicing of water heater and boiler systems; repair and refurbishment of hot water and boiler systems