graham1 Posted February 18, 2022 Share Posted February 18, 2022 i Have recently posted this problem and all responses suggest 3 way valve but only 2 radiators heat when DHW is on even tho heating off. Could it be piping set up incorrectly Link to comment Share on other sites More sharing options...
ProDave Posted February 18, 2022 Share Posted February 18, 2022 Has it EVER worked properly or has it always been like this? My guess is common return pipe for heating and HW and convection flow when hot water is circulating to the HW tank and only a couple of upstairs radiators getting hot. Link to comment Share on other sites More sharing options...
tonyshouse Posted February 18, 2022 Share Posted February 18, 2022 Unwanted convection, a check valve will stop it I hope Link to comment Share on other sites More sharing options...
Nickfromwales Posted February 18, 2022 Share Posted February 18, 2022 @graham1 It is unhelpful and laborious for you to start another thread to discuss this Already discussed and open here for further input…… Link to comment Share on other sites More sharing options...
graham1 Posted February 19, 2022 Author Share Posted February 19, 2022 11 hours ago, ProDave said: Has it EVER worked properly or has it always been like this? My guess is common return pipe for heating and HW and convection flow when hot water is circulating to the HW tank and only a couple of upstairs radiators getting hot. Been like this from installation - Only 2 downstairs radiators affected. Not sure if this is the right way to respond!! Any advice appreciated Link to comment Share on other sites More sharing options...
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