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Unwanted reverse flow between tees
I recently replaced the on demand electric water heater for my in-floor heating system with a Stiebel Eltron "Hydroshark". I also re-piped it to be a Primary/Secondary loop system. I added temperature gauges on the supply and return lines of both P & S loops so I could see what was happening on each. Based on the temperatures there is reverse flow between the closely spaced tees. I'd like to have 130 to 140 going out on the supply but with 3 or more zones open it only reaches 110 to 120 (I have 6 zones). I used Grundfos 26-99 3 speed pumps on the P/S loops and have tried a few different settings but still cant stop the reverse flow. What would you say are my options to resolve this? Is the Secondary pump moving too much water? Can I increase the flow on the primary? If so how is this done?
Any suggestions would be great! Thanks...