22.30.00 Plumbing Equipment
22.35.00 Domestic Water Heat Exchangers
22.35.13 Instantaneous Domestic Water Heat Exchangers 22.35.13.13 Heating-Fluid-in-Coil, Instantaneous Domestic Water Heat Exchangers 22.35.13.16 Domestic-Water-in-Coil, Instantaneous Domestic Water Heat Exchangers 22.35.13.19 Heating-Fluid-in-U-Tube-Coil, Instantaneous Domestic Water Heat Exchangers 22.35.23 Circulating, Domestic Water Heat Exchangers 22.35.23.13 Circulating, Compact Domestic Water Heat Exchangers 22.35.23.16 Circulating, Storage Domestic Water Heat Exchangers 22.35.29 Noncirculating, Domestic Water Heat Exchangers 22.35.29.13 Noncirculating, Compact Domestic Water Heat Exchangers 22.35.29.16 Noncirculating, Storage Domestic Water Heat Exchangers 22.35.36 Domestic Water Brazed-Plate Heat Exchangers 22.35.39 Domestic Water Frame-and-Plate Heat Exchangers 22.35.43 Domestic Water Heat Reclaimers