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Posted by jackson on August 27, 2006, 6:11 pm
>I have a hydronic heating system in my home. The pipes knock in the
> walls when the boiler starts up. I've had 3 plumbers come verify that
> the boiler is working properly (valves not flowing the wrong way,
> enough space where the floorboard vent pipes come through). The house
> was just built shoddily without enough space between the pipes and
> joists. The knocking comes from a dozen places throughout the house,
> and you can follow the noise via the route of the water. It literally
> wakes the house up at night.
>
> So I can rip apart the ceilings of each room and try and track each one
> down. Blah.
>
> The last plumber we had suggested that we try changing the boiler to a
> new energy effiecient model that monitors the outside temperature and
> would not go from zero to 180 degrees when turned on. Instead, it would
> maintain a temperature throughout the system, only raising and lowering
> when needed, which would vary about 1-2 degrees. This would reduce the
> total expansion in the system, and thus reduce the knocking. I'm in
> Vancouver, so the temperature fluctuations are pretty small, anyway.
>
> Logically, this makes sense. Has anyone seen this in practice, or have
> other opinions? And does ~12K for such a system sound about right?
>
> mk
>
Have you tried bleeding the air out of the system? Is the expansion tank
working properly?
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