Hello rab, welcome to the forum.. I'll try to answer your questions.. the AHS multi-fuel boiler is a good design, we have at least one member here using one, his forum name is ' ktm rider ' you could PM him if you wish with specific questions or he may reply here.
The AHS multi fuel boiler is a hand feed boiler, and will require daily tending, in really cold weather maybe twice a day.. The boiler is very well built, and it does burn wood, anthracite and Bituminous coal.. and if you buy the oil burner option can burn oil as a backup fuel source. I don't know about burning the bio diesel, or other fuel-oil replacements in oil burners,, there may be some nozzle changes needed,, just not sure.
If you want a boiler that only needs tending every day [cold weather] to several days [warm weather] consider a stoker boiler,, they burn only anthracite coal, and some have an oil burner backup available.. a stoker, depending on which one usually only needs feeding of coal every few days or as long as once a season if it feeds from a big coal bin. the ashes need to be taken out and the ashpan kept clean every day to every week,, depends on the burn rate.
As Richard mentioned,, if you get a stoker, you can run it all year,, they idle down to a maintenance or pilot fire very well, and can provide Domestichot water all year round for a very reasonable cost.,, this may be cheaper than an electric water heater, depends on your water useage and electric rates.
Bagged coal can be purchased by the pallet, usually around 2600#, each bag is either 40# or 50#, so it can be carried fairly easily. If you are near enough to I-81 40 miles south of I-80, that is the heart of Anthracite country, and if you have access to a truck/trailer, you can go buy bulk coal from the breakers directly, and save the cost of the middleman. Or just have it delivered to a bulk coal bin at your location.
Your location of a boiler is mostly dictated by the chimney availability and ease of access to a coal bin, and outside door for taking the ashpans out. connecting the plumbing from the other side of the basement is not a big deal.. Just remember, you will be tending this boiler daily or weekly,, make sure it is easy to access..
That's it for now, Hope this helps.. Greg L