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Mike,
The gray tubing is just protection they put around the PEX as it comes up through the floor.
The three lines coming from the garage were a last minute add by me so, yes, they hammer drilled those holes from the garage side. Easier, I guess, because the pea gravel for the garage floor slab was in place and they didn't have to hoist a drill over their heads otherwise. The foundation is 10" thick with a lot of rebar.
Yep, two circulation pumps as you correctly described.
The little silver boxes on the supply lines on the left side of the boiler are the zone valves.
Those are controlled by the thermostats and open only when their respective zones call for heat.
Garage is up to 43° already.
Balmy.......
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