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My wee App gave me the following result;
15mm copper tube will do.
8KW heat load.
70F/50R - 20Delta T
20M tube length, 10elbows, 2tees.
Flow rate 0.35M3/h
Water velocity 0.55M/s
Pressure drop 0.9 mWC
Pressure drop 2.8mWc/100M
Stick in 22mm main F&Rs, you know it makes sense!!
And as you know, that velocity is un acceptable, so better make the pipe smaller.lol