Looking for help with Viking Junior

I am looking for information on my viking Junior. It is a 1982 so its an older one for sure. I am trying to put it in my garage and run underground lines to my house. The supply and return is currently and 1 1/2 inches. I would like to drop this down to 1 inch or 3/4 but my run to the house is about 100 feet. I am not sure what this stove puts out for btu or how big an area it will heat. I am planning to burn wood and not coal because i am in a residential area. Any info on this stove would be great thanks in advance.

Wade