I have a VF3000. Get more unit then this. It is only rated at 95,000BTU. I make it work but should have bought the Keystoker. I waited a whole year and caved in a bought the Harman.
I was thinking the same thing...the VF3000 seems like the wrong tool for the job when talking about a 175 yr old 3000 sq ft house. The S130 may or may not be up for it either. Do the math and see what size boiler is needed. If you think that is too complicated, at least assess the current boiler in the home and how much fuel is consumed.
No one asked, but I'll tell you anyway...my favorite stoker boiler is an EFM 520. I have installed three of them, and number four arrived yesterday.