Munchkin & Rinnai in the house

The Rinnai on-demand (aka tankless) hot water heater was intalled yesterday, as was the Munchkin boiler for the radiant floor. Both run on propane and are super efficient. It costs more up front to install these types of appliances, but the energy efficiency will be worth it in the long run. There is a little further hook-up still to be done, as you can see in this picture, the water hasn't been connected yet to the Rinnai:

Here's the Munchkin and its associates, various pressure gages, nozzles, valves, tanks and vents. I'm not sure what all the parts do yet, but at some point I'll get somebody from Barron Heating to go over the whole system with me, because not only am I curious but I figure as a homeowner I should know which valves to turn and other maintenence tidbits. There are still some wiring and other connections to make with this as well.
Here it is with the cover opened, so you can see all the "guts".
On the inside, the mudding and taping has begun, which looks like this:
Fortunatley the weather has continued warm, so the mudders aren't suffering any fall chilling while the heating system is being completed.