On Sat, 28 Jan 2006 09:33:05 -0800, Aidan wrote:


John Stumbles wrote:

Up in the storage tank you could see a little
sort of plume of turbulence in the water where warm water was getting
pushed back into the tank and mixing with the colder water.


It's odd that it was coming out of the open vent 500mm above the water
level in the tank; must have been something like a NRV in the cold feed
pipe.

It wasn't coming out of the vent pipe after I'd raised it and lowered the
water level in the tank. It was coming back up the feed pipe, hence the
little plume of turbulence by which you could see it.