[LazyPup]

The statement that I have avoided answering your question directly is totally false.

If you will go back and read my responses you will see that I made the following comment:

"Providing that both boilers are of the same type and operating at the same maximum working pressure there is no problem with supplying them from a common manifold and feedwater pressure control."

If you are asking me if I would personally operate multiple boilers from a common feedwater control the answer is "NO", but then I was trained in firing high pressure steam boilers where water level conditions are critical and when firing live steam you become paranoid about water level. Such is not the case with circulating hot water boilers.