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PostPosted: Thu Nov 09, 2017 11:43 am 
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Hi... I have 9 water radiators distributed in two floors in need of balancing, and have bought a differential thermometer. I am interested in knowing the order in which the hot water tube feeds them, in order to balance my heating system following that order. I see that some people recommend putting the heating system off, and then putting it back on to identify the sequence in which the radiators heat. With 9 radiators and 2 floors, this is rather tricky... I wonder, can't I identify the sequence just by ordering the radiators by decreasing inflow temperature? Cheers.


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PostPosted: Thu Nov 09, 2017 4:35 pm 
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debowicz wrote:
I wonder, can't I identify the sequence just by ordering the radiators by decreasing inflow temperature?

You can try, but I doubt if there is going to be a significant difference between the nearest and furthest radiators. In any case a rad which is on a long 15mm connection from the main 22mm pipe may show a lower flow temp than one on a short connection, even if it is earlier in the sequence.

Don't be too concerned with getting the "correct" temperature -11C (non-condensing) or 20C (condensing); they are just guides. The important thing is that the drop is the same on each rad. If you have a combi boiler the pump speed is not normally adjustable; but you can normally adjust the pump speed on system and open vent boilers. A lower speed will give a higher differential.


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