A.O. Smith BTH 300A - Manual (Page 31)

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MANIFOLD KITS
Precision cut type “L” all copper A.O. Smith manifold kits assure water flow balance of all units. Without this balance, the full water heating
and storage potential of the system cannot be achieved. Plus, the units with the higher water flow may have a shortened life. Unions shown
in piping diagrams are not included in the manifold kits.
Dimensions shown are for minimum space occupied by the water heaters assemblies.
Space for the venting system and unit servicing must be added.