I'm ready to plumb my water to air hx in forced air plenum. I have manual adj mix valve that has large temp range of 110 to 176 degrees. I was thinking of using the mix valve in the hx zone to limit temp of water to make storage last longer depending on weather conditions outside . Instructions with valve say supply temp should be 20 degrees higher than desired output. I assume that means if I am at 180 temp with boiler, valve will supply 160 degree water to fan coil. That would make storage go farther, and in moderate weather be ok, but thinking that would not supply enough heat when temps are cold. Has anybody else done this? Any thoughts on if this is not such a bright idea? I've seen some caleffi drawings where motorized valves /outdoor reset was used. Not sure if those valves have different mix perameters. I had it plumbed up previously without mixing valve and it worked great, just trying to get more time out of pressurized storage which I am adding now and reason for re plumb.