22.33.00 Electric Domestic Water Heaters
22.33.36 Commercial Domestic Water Electric Booster Heaters
22.33.13 Instantaneous Electric Domestic Water Heaters 22.33.13.13 Flow-Control, Instantaneous Electric Domestic Water Heaters 22.33.13.16 Thermostat-Control, Instantaneous Electric Domestic Water Heaters 22.33.30 Residential, Electric Domestic Water Heaters 22.33.30.13 Residential, Small-Capacity Electric Domestic Water Heaters 22.33.30.16 Residential, Storage Electric Domestic Water Heaters 22.33.30.23 Residential, Collector-to-Tank, Solar-Electric Domestic Water Heaters 22.33.30.26 Resi. Collector-to-Tank, Heat-Exchanger-Coil, Solar-Electric Domestic Water Heaters 22.33.33 Light-Commercial Electric Domestic Water Heaters 22.33.36 Commercial Domestic Water Electric Booster Heaters 22.33.36.13 Commercial Domestic Water Electric Booster Heaters 22.33.36.16 Commercial Storage Electric Domestic Water Heaters