wrote in message
...
On Mon, 26 Jan 2009 22:07:02 -0000, "Arthur2"
wrote:

Hi all.
The wife often lets our 6 year soak in the bath water while
the shower continues to flow whilst submerged.
Does this have a detrimental effect on the combi?

Thanks.

Arthur

Thought that was against water regulations because of possible back
syphoning ?

A non return valve should be in the supply pipes.