When I purchased my outdoor boiler a few years back I had do certify that it was going to be heating a farm building or I had to buy a fancy gasser unit. No one cared that I also ran pipes to the house. Many people around us heat with wood and almost all have outdoor boilers. My insurance guy put the boiler on my policy as if it were another building. He didn’t care in the least.
As a people we will be regulated until we can’t even stand up without a permit.
Several years ago I decided to try to get a qoute from another insurance company with a combined policy to save some money. Agent came out, took measurements/pictures and said they could do a lot better than what I was currently paying. He then send it in to corporate for final approval and would get back with me. He later did and said they rejected it as I had a :"wood stove" in my barn. If I would take that out they could do it. This was State Farm. The stove is a UL listed add on wood furnace and the walls are Insulated/finished/painted drywall. He took more pics showing the label on the stove and the "barn" and assured me it would be approved. He called back later and was upset as they still refused and this was about 8 years ago.