In Indiana can a domestic hotwater loop and a hydronic heating loop be the same loop with no separation?

I am not familiar with Indiana Plumbing Code. Please, wait for our other Expert to answer your question... In the interim, in my area of operation - in So.California, you cannot combine domestic hot water and heating loop. Milo

Hi Tom

Provide a little more info. Here, OK? Are we talking about a hot water storage system with integral coil or what?

Mark