Hi,

I recently drained my friends combi boiler added some sludge remover, then
eventually put some inhibitor into the system, for the first couple of weeks
my friends was really pleased as he noticed that the boiler was quiter,
however he is not noticing that when he puts the hot water on there is brown
water that initailly comes out, he is positive this has only started since
the system was drained.

Any ideas what could possibly be doing this.

BTW, sludge remover and inhibitor fed into the system via radiator.

Regards

"Hello" wrote in message
...
Hi,

I recently drained my friends combi boiler added some sludge remover, then
eventually put some inhibitor into the system, for the first couple of
weeks
my friends was really pleased as he noticed that the boiler was quiter,
however he is not noticing that when he puts the hot water on there is
brown
water that initailly comes out, he is positive this has only started since
the system was drained.

Any ideas what could possibly be doing this.

BTW, sludge remover and inhibitor fed into the system via radiator.

Regards

A leak in a heating coil somewhere inside the system causing water from the
boiler/radiator part of the system to get into the hot water part of it. The
sludge remover probably removed sludge that was actually sealing the
pinhole. Very common in the coils inside immersion tanks as they corrode
internally.
--
"I found this stone in the park yesterday. It's been worn to a perfect
sphere by the elements and dimpled by time."
"Harry, that's a golfball!" (3rd Rock From The Sun)

Dave Baker wrote:

A leak in a heating coil somewhere inside the system causing water from the
boiler/radiator part of the system to get into the hot water part of it. The
sludge remover probably removed sludge that was actually sealing the
pinhole. Very common in the coils inside immersion tanks as they corrode
internally.

In a combi this would be a leak in the secondary heat exchanger. This
is where water from the primary circuit (ie the stuff that goes through
the radiators) "meets" the domestic hot water that comes out of the
taps. In fact that they shouldn't quite meet, they should just get
close enough either side of a piece of thin metal for the heat to pass
from one to the other.

However, as Dave says, it may be that the sludge remover was a bit too
aggressive and has corroded the metal of the heat exchanger allowing
water from the primary circuit into the DHW. This would lead to a loss
of pressure in the primary circuit as water seeped out. Is your friend
having to top the boiler up using the filling loop?

If the heat exchanger was in that state and the system was sludged up
anyway I wouldn't feel too bad about it - the heat exhanger would have
needed replacing soon. If it does need replacing it should be done as a
matter of urgency. You don't want to be doing your washing up in water
from the rads, and constantly topping up the primary circuit means that
the corrosion inhibitor is being diluted and the system is likely to
suffer from more sludge and corrosion.

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "Hello" saying
something like:

however he is not noticing that when he puts the hot water on there is brown
water that initailly comes out, he is positive this has only started since
the system was drained.

Any ideas what could possibly be doing this.

His neighbour is ****ting in the tank.

Seriously; there's often a lot of gunge in the bottom of cold tanks that
have been undisturbed for years. An occasional clean out is a good
thing.
--

Dave

replying to Martin Pentreath, eggheadstevens wrote:
It would actually increase the pressure in the heating system causing it to
escape out the pressure relief if the in coming mains as would be expected be
greater than 3 bar

--
for full context, visit https://www.homeownershub.com/uk-diy...ap-367266-.htm

On Wed, 01 Mar 2017 22:14:04 GMT, eggheadstevens
m wrote:

replying to Martin Pentreath, eggheadstevens wrote:
It would actually increase the pressure in the heating system causing it to
escape out the pressure relief if the in coming mains as would be expected be
greater than 3 bar

It was TEN years ago mate.
Read this
http://wiki.diyfaq.org.uk/index.php/Home_owners_hub
--

Graham.
%Profound_observation%

On Wednesday, 1 March 2017 22:14:12 UTC, eggheadstevens wrote:
replying to Martin Pentreath, eggheadstevens wrote:
It would actually increase the pressure in the heating system causing it to
escape out the pressure relief if the in coming mains as would be expected be
greater than 3 bar

If you use a sane newsgroup client or portal you won't be replying to 10 year old posts. This is news:uk.d-i-y.


NT