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The reason we show both methods of piping basicly involves the fact that we still ship this boiler in its packaged form with the circulator mounted and wired on the return piping.This was retained mostly at the request of several of our larger national oil accounts. Most of our other boilers include the circulator but it is neither mounted nor wired. If you look closer though you will see that it is indeed still pumping away because we show the expansion tank on the return side also. Again, this was done as a request from some of our larger end users.
Manager of Training