CH Draining - why do they do that?

16 Sep 2004
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United Kingdom
Just drained my CH system. It has had X400 in for the last few months so just draining / flushing (letting the clean water run through whilst hose still attached). Anyway, drained via rad in kitchen, this drained the whole of upstairs and itself, but did not drain the other 4 rads on the ground floor. Each of the downstairs rads has a drain tee so i had to drain each one individually. Why have they done this? My previous house had just one drain tee on the hall rad, this drained the entire system.

Any ideas?
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usualy means pipes on droppers from above ie water cant travel uphill

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