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Installing a 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 cascade systems. Read them
carefully before designing or installing the system.
5.1 Connecting Water Supplies
Several options are available for plumbing a cascade system of water heaters. The options shown here are only
examples. The setup you choose will vary based on the installation location, local building codes, and other
factors. Follow all applicable regulations when installing a cascade system.
You can connect up to two water heaters to meet high-volume hot water demands.
Communication
Cable
DHW Supply Line
Cold Water Supply Line
Gas Supply Line
Union
Ball Valve
Check Valve
Faucet
Expansion Tank
Pressure Relief Valve
[Example of Water Heater 2-Unit Cascade System]
Communication
Cable
DHW Supply Line
Cold Water Supply Line
Gas Supply Line
Union
External Pump
Ball Valve
Check Valve
Faucet
Expansion Tank
Pressure Relief Valve
[Example of Water Heater 2-Unit Cascade System with Recirculation]
5. Installing a Cascade System
