In zone valve setups, a separate zone valve is installed in the pipe to or from each zone. In most installations, the zone valves are in the returns, where the water is cooler. The cooler temperatures ...

Description: A replacement for normally-closed, synchronous motor zone valves, this product is ideal for closed-loop hydronic heating and cooling systems, fan coil units, and baseboard systems. It ...

Recently I wrote in this column that every component in a controls circuit is a power supply, a switch or a load — no other possibilities. And that means that every control, hydronic or otherwise, is ...