Dunkirk H2OI Single Coil Stainless Steel Indirect Water Heaters - Manual (Page 14)

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Pipe relief valve discharge
to within 6" of floor. See
Section III, item #5.
Pipe relief valve discharge
to within 6" of floor. See
Section III, item #5.
Figure 3 - Boiler Water Piping with Zone Circulators
Figure 4 - Boiler Water Piping with Zone Valves