John Wood Electric Water Heaters - NEW - Manual (Page 8)

8
WATER PIPING PRESSURE TEST NOTE: To protect against untimely corrosion of hot and cold
water fi ttings, it is strongly recommended that di-electric unions
or couplings be installed on this water heater when connected
to copper pipe.
Figure 3A shows the typical attachment of the water piping to the
water heater. The water heater is equipped with 3/4 inch NPT water
connections.
NOTE: If using copper tubing, solder tubing to an adapter before
attaching the adapter to the cold water inlet connection. Do not
solder the cold water supply line directly to the cold water inlet,
it will harm the dip tube and damage the tank.
FIGURE 3A.
FIGURE 3B.