Hot water gets really hot. When heat zone calls it is also traveling through hot water zone. I replaced taco flow ck valve. It is branched off of same feed going to heat zone valves but I was tol that shouldn't be causing this. enter image description hereenter image description here

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    You may want to be more specific. You wrote casually like you are talking to someone who is already familiar with the type and setup of your system, and that's not us. You can add info or rewrite by using the "Edit" link right under your post, just make sure you are logged in. – Harper - Reinstate Monica Apr 22 '17 at 16:27

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