I have in-floor water radiant heating. There are five zones of varying sizes. In some larger zones there are multiple circulation loops split from the supply and then recombined for the return.
I understand why there are multiple circulation loops. In my setup when there are multiple loops in a single heating zone there are also multiple zone valves (one for each loop within the zone.)
Multiple zone valves in the same heating zone (as I have now) all activate at same time when there is call for heat. This seems to create more wiring and valve complexity and more to go wrong
Why isn't there just one zone valve per zone on the supply line, which would then split after the valve?