Zone 0 is IN the bath and it does not extend above the height of the bath.
Zone 1 extends above the bath 2.25mtrs as per RF's post Above 2.25mtrs is outside of zones.
Zone 0 has changed to include wet room type showers but it still only extends 100mm from the floor/shower tray.
In plan, zone 1 only extends out the width of the bath/shower unless it's a wet room and then zones 0 & 1 are combined and extend 1200mm from the waste outlet
So if the bath is 500mm wide, zone 1 is 500mm wide and then it become zone 2 for 600mm.
Zone 0 (for a bath) is the same as the 16th - In the bath, not upwards or outwards but IN the bath.
It's also the same for a shower with a basin.
For a shower without a basin zone 0 used to be a radius of 0.6M from centre point of fixed water outlet, under the 17th it now extends to a radius of 1.2M.
The height from the floor has also changed, Zone 0 used to the up to 50mm from the floor level, it's now 100mm from the floor level.
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