I had 2 zones, upstairs and down. Both had a hot water heat exchanger mounted on the air handler outlet.
When thermostat called for heat it would open zone valve and start the boiler and it’s circulating pump. Could never get zone valves to work right, and usually kept both manually open so water would always flow in both zones.
Took off work
Final grading of the yard
Work on boiler. Electric to boiler and side shot power exhaust.
System is interlocked so the side shot so it must be running before boiler will ignite.
Called for final electrical and plumbing inspection for Monday.
Called for final bank inspection and draw.
My garage is now on this side of the house. I reused this little deck on the back side of my garage.