Water Connections continued-
Figure 7 – Replacing the Backup Water Heater in a
To replace the previous backup water heater with the new solar water heater with electric backup, remove the backup water heater. The new solar water heater with electric backup has an internal heat exchanger allowing direct heat transfer to the water. For installation of the new solar water heater with electric backup, refer to “INSTRUCTIONS FOR POTABLE CONNECTIONS” earlier in this section and Figure 7. Connect the solar piping in series from the new solar water heater to the previous solar water heater as shown in Figure 7. This allows the solar heat to transfer directly into the backup tank. The remaining heat that was not transferred into the backup tank is then made available to the previous solar water heater before going back to the solar collector. One installation advantage is that the solar heat makes up for heat losses that occur when water is not flowing. Another is that more heat is absorbed into the potable water system from the solar water heating system.
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