Brochure

A. O. Smith tankless water heaters can be used in a wide variety of applications. Whether used in recirculation systems, in conjunction
with storage tanks or with heating applications, our commercial units are built to provide continuous hot water when sized appropriately
for your home’s needs.
*Local codes dictate proper compliance.
TANKLESS APPLICATION DIAGRAMS
Basic Installation
(excluding 540P)
540P Basic Installation
(540P only)
All application diagrams shown are concept drawings only. These diagrams are only to be used as basic guides. It is up to the application designer to properly design the plumbing layout
and correctly size all components within an application (pumps, piping, storage tanks, water heaters, etc.). All national and local codes must be followed and will dictate proper compliance.
Hot Water to Fixtures
Hot Water Return
Gas Supply
Cold Water Supply
Expansion Tank
1. Recirculation pump shall be sized for 2-4 gpm per activated heater (4-8 gpm for 910)
2. Recirculation pump shall be controlled by an aquastat. The minimum suggested differential should be 10°F
3. For installations without recirculation, remove the check valves, pump, and aquastat.
Legend
Pump
Shut Off /
Isolation
Valves
Pressure
Relief
Valve
Air Vent
Aquastat
Check
Valve
Full Port
Ball Valve
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