Then opened the lockshields on upstairs 4 to 1/4 open. Downstairs rads are Full bore open. The upstair rads are now what I would consider appropriately hot without being too hot to touch. The downstairs rads are cold with the feed pipe lukewarm. I'll check it tomorrow and see what happens.. Radiators are cold upstairs but warm downstairs.Ive bled the system several times from the furthest radiator away first still no success. Ive tried shutting off radiators downstairs to boost heat upstairs. Yes this works to get it hot in box bedroom and bathroom only.But when i open downstairs slighty the heat goes back to the downstairs.

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Along the way, in contrast to forced air, a radiant system undergoes minimal heat loss. For that reason, even as it creates much more comfortable conditions, radiant heat consumes much less energy.. 26 Mar 2021. #1. Any help / guidance welcome - radiators upstairs (middle and top floor of house) cold but warm downstairs. Have recharged the system as pressure was zero. Also bled radiators upstairs - initially no water or air coming out of top floor ones but now water comes out but no heat. System has red expansion tank with pressure gauge.