I've see 4 Munchies tied together, cascading controls, etc. My fear is that if this guys load is really over 200K, and only one zone calls, there is not enough turn down ratio on the bigger single Munch or Ultra.

Hey, who knows which way to go until we know what load we are talking here. If he wants a 120 storage tank, he will need 240K to make that baby recover decently, along w/ the big piping, etc.

I liken multiple boilers to putting on heavier clothing as the weather gets colder. Modulation sure helps, but has limits...