"Grunff" wrote in message
...
IMM wrote:

The avergage bath is now 80-100 litres.

The average 'tin tub in front of fire' you mean?

Our bath is 270 litres capacity to overflow. SWMBO fills it to the
overflow. Discounting her volume, which can't be more than say 60
litres, that's 210 litres of water. Ours in not a particularly large bath.


I did some quick rough calculations and came up with a figure of roughly
10mm depth for 10 litres (8-11 litres depending on the bath). This makes
~270mm depth to overflow for G's bath, which seems about right. 80-120litres
would be ~80-120mm deep (before you get in). I would normally run a bath to,
say, 200mm deep and it would then reach the overflow when I got in (making
me about 70litres (middle age spread)). I would agree that ~200litres was
required for a "good" bath, 150litres if you are in a hurry.

Of course, one has to take into account the hot water temperature as you can
run cold at the same time as the hot is flowing, which boosts the overall
fill rate. Say 30%cold 70% hot, that's 140litres hot for a "good" bath. at
18l/min that would be 7-8min.

All rough figures of course and YMMV, but 7-8min is a long time to wait,
unless you go off and do something else (but liveable with I suppose).
Emprical observations (from no combi at home (3-4min) and using decent combi
away on holiday) would seem to confirm these figures.


--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not)