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Posted by HeatPro on September 28, 2010 at 10:39:06:
In Reply to: connecting two rooms to one zone using a tee at supply header after zone valve posted by John on September 28, 2010 at 09:11:03:
Let's reword the question a bit.
Will an unknown pump pressure, through unknown unequal pipe lengths, provide an unknown amount of heat to two rooms?
Yes, water will flow through 1/2 inch pipe from a 3/4 inch pipe. You won't know the resistance of each pipe run, so you won't know what percentage of the water will pass through each room - whether it is enough to heat one or both rooms enough.
Many post questions looking for a guess without science. All that's left is to try it and see if the guess worked.