Central Heating - HELP my new house is cold because the downstairs radiators much cooler than those upstairs?

Just moved into my new house but downstairs is really cold because the radiators downstairs only get warm('ish) compared to those upstairs (which get very hot). The OH and I have tried suggestions from friens - set the radiator thermostats lower upstairs, bled the radiators, let air any out of the boiler through the automatic release valve, balance the system (by almost closing the flow/return valves nearest the boiler (five radiators upstairs) and fully opening the valves on those furthest away (five radiators downstairs, three large 1200x600). Opening the boiler and putting my hand against the pump suggest that its working as its hot is I can feel it gently vibrating. Have also loosened the pump screw to let any air out - water comes out and the inside screw spins freely. Pipework - boiler 33mm branching into a T piece - 33mm upstairs, 25mm downstairs. Each radiatior has an 8mm flow and an 8mm return to 25mm/33mm feed and return loops. Would appreciate any advice you have, thanks!!Central Heating - HELP my new house is cold because the downstairs radiators much cooler than those upstairs?
Try bleeding the air out of all the radiators. Check your expansion tank; if it has a sight glass on it, the water level should be in the middle. Check the circulating pump or pumps if it is circuited with more than one pump.Central Heating - HELP my new house is cold because the downstairs radiators much cooler than those upstairs?
I'm no expert on this but if your 33mm to T piece is on the horizontal or on its side with the feed to upstairs at the top, then wouldn't logic say that most of the hot water will automatically go upwards?


If it is on either way, the hot water will rise and move faster than downwards ie to your downstairs radiators. Maybe this would account for the downstairs radiators only getting slightly warm. My radiators in the UK are fed from a central feed with a feed off to each radiator. The feed goes to the downstairs radiators first.


Hope this helps.
Make sure the boiler temp is up to sufficiently heat the house. Depending on control setups, and cold day (0 Degrees) water temp should be around 180 degrees. You also need to bleed the air out of each radiator that is giving you problems. In a closed loop system, air acts just like a plug. You must get t he air out for the water to circulate back to the boiler. Bleeding the air out of the boiler itself will not do much good, since the air is up in the house.

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