I have a Bosche Greenstar Condensing Boiler. It is installed with a
vertical flue about 1200mm long.

The boiler has been running fine, but lately it has been pooling water
underneath it every couple of days.

I have removed the cover from the boiler and traced the water to the
bottom of the flue, where the white flue pipe enters the boiler and
joins a grey pipe. At this join there appears to be water dripping
out.

Below this join is a grey cylinder; I think this is the Condenser???

Is it likely that this will be full of water? Below the grey cylinder
is 2 vertical grey pipes, one of which is teed into with a black pipe
that goes to a white box and then to the condensate drain.

The two vertical grey pipes are capped at the bottom.end in a cap.

Does this problem mean there is a blockage in the drain?
Should this boiler have been installed with a vertical flue?
How can I drain this water out of the flue?

Thanks.

wrote:
I have a Bosche Greenstar Condensing Boiler. It is installed with a
vertical flue about 1200mm long.

The boiler has been running fine, but lately it has been pooling water
underneath it every couple of days.

I have removed the cover from the boiler and traced the water to the
bottom of the flue, where the white flue pipe enters the boiler and
joins a grey pipe. At this join there appears to be water dripping
out.

Below this join is a grey cylinder; I think this is the Condenser???

Is it likely that this will be full of water? Below the grey cylinder
is 2 vertical grey pipes, one of which is teed into with a black pipe
that goes to a white box and then to the condensate drain.

The two vertical grey pipes are capped at the bottom.end in a cap.

Does this problem mean there is a blockage in the drain?
Should this boiler have been installed with a vertical flue?
How can I drain this water out of the flue?

Don't know which Bosch model you have, but mine has a condensate
reservoir which at the bottom left which fills up and empties
periodically via a syphon arrangement - the idea is so it doesn't drain
with a continuous trickle which would make it likely to freeze during
icy conditions.

I suspect yours just has a leaking joint in the condensate drain pipework.

David

In article ,
Lobster writes:

Don't know which Bosch model you have, but mine has a condensate
reservoir which at the bottom left which fills up and empties
periodically via a syphon arrangement - the idea is so it doesn't drain
with a continuous trickle which would make it likely to freeze during
icy conditions.

I suspect yours just has a leaking joint in the condensate drain pipework.

Given how quickly the slightly acidic condensate can damage
a boiler (the casing in particular), I did quite a thorough
check on my Keston for any such leaks after having had one
in a faulty flue part. I left a hosepipe trickling in to
the flue exhaust terminal for about 30 minutes to check
that it was draining away correctly with no water appearing
where it shouldn't. I don't know if that's a safe test to
do on your boiler without risk of damage, not knowing that
boiler. One of the gas installers might comment, but I would
suspect this should be safe on most condensing boilers as
they have to handle condensate running back down the flue.
(Make sure you don't feed it into the air intake though!)
It might not test all the same condensate paths that are
followed by condensate generated in the heat exchanger
though (it does in the keston C25).

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On Sat, 12 Jan 2008 10:54:46 +0000, Andrew Gabriel wrote:

... I left a hosepipe trickling in to
the flue exhaust terminal for about 30 minutes to check
that it was draining away correctly with no water appearing
where it shouldn't. I don't know if that's a safe test to
do on your boiler without risk of damage, not knowing that
boiler.

I do sometimes run water in through the tapping point on W-B flues (or
even pour in through the flue terminal) to test the condensate
pipework. Never had any appearing anywhere inside the boiler but they are
W-Bs, not Baxi Barcelonas :-)


--
John Stumbles

Things don't like being anthropomorphised.