22.34.00 Fuel-Fired Domestic Water Heaters
22.34.36.29 Commercial, Grid-Type, Finned-Tube, Gas Domestic Water Heaters
22.34.13 Instantaneous, Tankless, Gas Domestic Water Heaters 22.34.30 Residential Gas Domestic Water Heaters 22.34.30.13 Residential, Atmospheric, Gas Domestic Water Heaters 22.34.30.16 Residential, Direct-Vent, Gas Domestic Water Heaters 22.34.30.19 Residential, Power-Vent, Gas Domestic Water Heaters 22.34.36 Commercial Gas Domestic Water Heaters 22.34.36.13 Commercial, Atmospheric, Gas Domestic Water Heaters 22.34.36.16 Commercial, Power-Burner, Gas Domestic Water Heaters 22.34.36.19 Commercial, Power-Vent, Gas Domestic Water Heaters 22.34.36.23 Commercial, High-Efficiency, Gas Domestic Water Heaters 22.34.36.26 Commercial, Coil-Type, Finned-Tube, Gas Domestic Water Heaters 22.34.36.29 Commercial, Grid-Type, Finned-Tube, Gas Domestic Water Heaters 22.34.46 Oil-Fired Domestic Water Heaters 22.34.46.13 Large-Capacity, Oil-Fired Domestic Water Heaters 22.34.56 Dual-Fuel-Fired Domestic Water Heaters