The PID is helpful to keep the boiler at a stable temperature because its volume is small but does little to keep the group head stable. The group itself gets e

The PID is helpful to keep the boiler at a stable temperature because its volume is small but does little to keep the group head stable. The group itself gets either too hot or too cold and thats a much more challenging problem. The boiler has to be hotter than the group due to losses but you don’t want to be constantly circulating water either so a lot of trade offs have to happen. One of the better ways I’ve seen is that the water tank is directly above the group. It makes the group very stable but unfortunately makes the machine itself prone to tipping due to high cg.