Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
WM indirect water heater boiler side piping
Looking over the installation manual I noticed that the recommended boiler side piping for the Weil Mclain Gold Plus indirect water heaters seems different than what I'm used to seeing. So I dug up a bunch of manuals for other brands, and they are all opposite of the Weil Mclain. WM says the boiler water goes in the bottom and out the top (parallel flow), others are saying in the top and out the bottom (counter flow). Can anyone explain why they are doing it different than all the others? I've done some research on parallel vs counter flow in heat exchangers and found the following:
"The design of a parallel flow heat exchanger
is advantageous when two fluids are required to be brought
to nearly the same temperature.
heat exchanger has three significant advantages over the
parallel flow design. First,
the more uniform temperature difference between the two
fluids minimizes the thermal stresses
throughout the exchanger. Second, the outlet temperature of
the cold fluid can approach the
highest temperature of the hot fluid (the inlet temperature).
Third, the more uniform temperature
difference produces a more uniform rate of heat transfer
throughout the heat exchanger."