wrote in message
oups.com...
Mogweed wrote:
I have a Baxi Bermuda 552 back boiler which gives pumped central
heating and
(what I believe is termed) gravity hot water, ie, when system is set
to hot
water only, the upstairs rads get warm as well.

no, thats called a plumbing ---up. Your upstairs rads are on the hot
water circuit.


I drained the system down today to replace a radiator

I'm guessing you replaced one of the ones on the HW circuit.


(pipework needs
altering) and I'm going to take the opportunity to also put in sludge
and
gunk remover, flush and finally add inhibitor. I went into the loft
to tie
up the ball valve then drained the system from the lowest drain cock
(which
took about 4 hours, even opening the bleed valves on the upstairs
rads when
the water level ahd dropped enough).

Thing is, we now have no water coming out of the hot tap. I knew we
wouldn't
have _hot_ water because there isn't any heating to heat it but I
still
expected water to come from the hot tap. My missus has had the
washing
machine on almost all day so that may well account for it, but that
leads me
to the conclusion that the tank in the loft where I tied up the ball
valve,
also feeds the domestic hot water system. Is this correct?

yep


My original plan was (when I'm ready) to pour the sludge remover (and
later
the inhibitor) into the tank in the loft but if it does, indeed, also
feed
the domestic hot water then I guess that's a no-no, so just how do
you get
it in there?

dont do that!!

1. By putting the chemicals in the right tank
2. It might also help to put your upstairs rads on the CH circuit
instead of the HW one. More economical and sanitary. But while its on
HW, dont even think of putting chemicals in it.

If in confusion, it may help to put a bottle of food dye into each
header tank and see what comes out where.


NT


Thanks Lurch and NT. There's only one tank in the loft so I guess it's the
"worst case scenario" time eh? (

Mogweed.