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Appendix
Cascade System
When installing a cascade system, carefully consider the design of the system and the features of the installation location. Follow all local codes
and regulations, as well as all guidelines for installing the water heater. The following sections describe additional considerations that are specific
to installing a cascade system. Read the following sections carefully before designing or installing the system.
Water supply
Several options are available for plumbing a cascading system of water heaters. The options shown here are examples only. The setup you
choose will vary depending on the installation location, local building codes, and other factors. Follow all applicable regulations when installing
a cascade system.
[VRP]
Ball valve
Circulation pump
Union
Check valve
Expansion tank
Pressure relief valve
Faucet
[VRS]
Ball valve
Circulation pump
Union
Check valve
Expansion tank
Pressure relief valve
Faucet
Gas supply
Gas supply
Hot water supply
Hot water supply
Recirculation line
Cold water supply
Cold water supply
Notice
• The recommended minimum recirculation flow rate for each water heater is 2 GPM.
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