Class 037
Construction and Repair Services
Water heaters; heating installations for water; water dispensing units comprised primarily of water tank, hot water heater units, faucets, and component parts therefor, sold as a unit; residential water heaters; energy saving water heaters; combination and indirect water heaters; electric water heaters, tankless water heaters, instant water heaters, and solar water heaters; combination water heater and hot water space heater; air cooling and ventilation apparatus and instruments; residential thermal battery; residential thermal battery system