No idea on the model, sorry, but it looks like a whole heap of fun.
looks like a dipper tube so a flo-jet or similar setup should work fine, but you'd probably want to run it plumbed in first to test the operation of the manual fill / non-return valve / sight glass (is that a sightglass on the lhs front panel?), that is if you're not planning on tearing it apart. Can't see an anti-vac valve either which would be a worthwhile addition (t-piece off the safety valve maybe), seeing as that's a big boiler for 2000W and will take forever to come up to temp.
I'm curious, what had to go before it was allowed in the house?