"Mike" wrote in message
...

"Christian McArdle" wrote in message
t...
IIRC it's required for larger houses but I can't remember the size
threshold
or what reg it's in (part L, I'd guess)

As I understand it, separately timed zones are suggested for floor areas
exceeding 150m2. However, temperature control for separate living and
sleeping areas is always required (usually using TRVs or subzoning)
unless
the flat is open plan and such control would be pointless.

True - part L 1.38

I also notice many don't notice the independently timed requirement of
part
1.39 and fit simple roomstats in the other zones when full timed
controllers
are legally required.

"1.39 In most dwellings one timing zone divided into two temperature control
sub-zones would be appropriate."

That is one time clock and TVRs on all rads, except the rad where a room
stat is. Over 150 sq M floor area and it needs a separate times zone.


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