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Water Connections continued-
TWO-TANK SYSTEM INSTALLATION
THE TYPICAL TWO-TANK SYSTEM
A typical two-tank system is provided in Figure 5. This system holds two separate volumes of water. The cold
water supply is delivered to the solar water heater. If solar energy is available, the water in the solar heater is heated.
This heated water is delivered into the backup water heater. If no solar energy were available, the backup water
heater would heat the water through electric elements or gas combustion, depending on the backup water heater.
Figure 5 – Water Heater Piping in a Two-tank Installation
The solar with electric element backup can be used to replace either the solar or backup water heater in the two- tank
installation. Replacement installation configurations are provided in Figures 6 and 7. By replacing either tank with
the new solar with backup heater, replacing the remaining tank when it eventually fails may be unnecessary. This is
due to the solar heater’s capability to satisfy the requirements of a two-tank system.