Bradford White UCG100H199 Installation & Operation Manual page 22

Connect the system supply and return piping to the water heater.
Refer to Figure 7 and Figure 8 for installation examples. Maintain a minimum 1/2" clearance from hot water piping to
combustible materials.
Figure 7. Alternate Space Heating Connections.
Figure 8. Typical Plumbing Schematic for Zoned Heating.
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