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Air in Wood sove back boiler ??

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Air in Wood sove back boiler ?? sndevereux@pensbyboys.wirral.s 04-17-2008
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Posted by sndevereux@pensbyboys.wirral.s on April 17, 2008, 5:29 am
Can anybody help here-We run a wood burning stove with a back boiler
for hot water. After being on for half an hour we get a loud knocking
and have to turn it down. Is this air in the back boiler- and how does
it stay their- cold feed at bottom/hot at top. Can I cure this-
chemicals added to feeder tank? or some sort of air outlet value????
22mm pipe I think > Any Advise appreciated.

Posted by cshenk on April 17, 2008, 1:38 pm
<sndevereux.uk> wrote

> Can anybody help here-We run a wood burning stove with a back boiler
> for hot water.

Neat systems. I've used them at camping cabins well in the woods and off
all electrical grids.

> After being on for half an hour we get a loud knocking
> and have to turn it down. Is this air in the back boiler- and how does
> it stay their- cold feed at bottom/hot at top.

Hot water making steam no doubt? Actually if the water is hot enough for
use at that 1/2 hour stage, this is when you are supposed to turn it down.
If not, you may blow a pipe fitting if it's like the one I used. There was
a bleeder valve on it that would 'whistle' like a teapot almost and we'd
lift a little plug to let pressure escape (much like bleeding off a pressure
cooker).

> Can I cure this-
> chemicals added to feeder tank? or some sort of air outlet value????

Air outlet valve would be the trick *if* it's like the one I used.

> 22mm pipe I think > Any Advise appreciated.

You may find the following link useful. One fellow in Wales has one with a
back burner like you may have.

http://www.off-grid.net/forum/topic/101



Posted by Edwin Pawlowski on April 17, 2008, 9:51 pm

> Can anybody help here-We run a wood burning stove with a back boiler
> for hot water. After being on for half an hour we get a loud knocking
> and have to turn it down. Is this air in the back boiler- and how does
> it stay their- cold feed at bottom/hot at top. Can I cure this-
> chemicals added to feeder tank? or some sort of air outlet value????
> 22mm pipe I think > Any Advise appreciated.

I'm not familiar with your setup, but I am familiar with steam boilers.
Sounds as though you are heating it up enough to make steam. The steam is
making water knock, a very common thing that can damage pipes. You should
be circulating the water to maintain a more even temperature below the
boiling point. Adding chemicals won't help.



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