An
installer is advised to use a buffer tank to prevent short cycling of a low
mass boiler serving several independently controlled space heating zones ...
The
installer got a great price on a “contractor pack” of 3/4-inch copper tees, so
the supply and return manifolds are built with 3/4-inch copper, as are all the
zone circuits ...
As it exists, this system works relatively well, but it could be further refined. See if you can spot some design details that would provide equal or better performance while using less hardware.