Hubbell Electric Heater Company WATER HEATER DF - Manual (Page 12)

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be installed so the heater may be disconnected for servicing if necessary. Hot water and return
circulation lines should be insulated. The cold water supply line should be insulated if subjected to
freezing temperatures. When a check valve is installed in the cold water line to the water heater, a
diaphragm type expansion tank suitable for potable water shall be installed in the system.
PIPING MULTIPLE WATER HEATERS
A parallel connection, see the following diagram, allows heated water from multiple heaters to flow
into the system to serve peak loads that can occur in a short time period. Pressure drop is reduced
and total storage capacity is available for immediate use.