What exactly is it they are having trouble sizing, pricing or installation?
The first two items are a matter for the boiler distributor.
The last item is a matter for the installing contractor who knows the local codes.
It is rare that a manufacturer can get involved when they do not know the local codes (they usually have a disclaimer, if you read fine print). In fact, most representatives are prohibited from making concrete recommendations- a legal issue that is taken up by consultants and contractors.
With that said, even if you get general knowledge from those here with steam boilers doesn't necessarily mean they are applicable in your locale.
Local codes have killed many a great idea, so beware,
Hope this helps.