HI BG, I forgot to mention, your AA130 likes to work,, I probably could get by with an AA 130 on my farm, but I found the AA260 first. So I'll be surprised if you need to upgrade the boiler when/if you add on some additional heat loads,, unless they are huge loads..
There is a guy in central PA that a fellow member has visited that runs about 20-24 tons of coal through an AA260 a year,, that's double my use... We also have a forum member who heats several houses and apartments with a 130, it runs almost continously in the cold months.. but these boilers like to work, they are the most efficient when near capacity..
And by changing your fan drive pulleys, you can speed up the fan a little and increase the BTu output some if needed..
So unless you are adding a 6000 sqft greenhouse
, your AA130 will probably carry the load.. a very general statement, but quite likely accurate.