Hi Doug,
The boiler will be in the garage, but I will be piping the hot water in the house also. Will just be heating the 4' crawl space below the house. I will just let the heat find its own way up and see how that works.
You mentioned going from an open system to low pressure closed. With the boiler I will be setting up, do I HAVE to make it closed? My thought was to maybe use a couple of 55 gallon barrels for thermal storage. Will the circulator pump stay primed as long as the in and out of the 55 gallon barrel is below the water level. I dont know much about the water part of it, so there is some learning to do yet.
Thanks for the info...