Bradford White RE350T6-1NC Series Installation & Operating Instruction Manual page 10

Water Connections continued-
Upright Models (See Figures 1A & 1B)
The hot and cold water connections are identified on the top of the water
heater (See figure 1A). For bottom inlet models (-503 models), the cold
water inlet is located on the side of the drain valve (see figure 1B). Connect
the hot and cold water lines to the installed nipples using unions. Install a
listed temperature-pressure relief valve in the opening on the side of the
water heater.
Figure 1A (Top Inlet Models)
Figure 1B (Bottom Inlet Models)
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