Boiler fully connected to 4 main zones plus the domestic hot water heater (extreme right).
The boiler was finally plumbed and commissioned. We lost a week while the plumber went hunting (fortunately he didn't hurt himself) but got the system up and running just in time for the weather to turn cold.
Some of the tubes have been installed to carry hot water into the floor. The tubes will be covered with 1 1/2 inches of concrete (then a finished floor is applied).