Exercise: Find at least five errors in
this layout.
The series primary/secondary piping shown in the Glitch
lowers the supply water temperature to the downstream secondary circuits. If
the DHW tank was allowed to operate simultaneously with space heating, the heat
exchanger in the indirect tank would get a relatively low supply temperature
due to temperature drop across the space heating secondary circuits. Better to
pipe these secondary circuits as parallel circuit to give them the same supply
temperature.