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Another heating radiator question
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Posted by Michael on February 04, 2004 at 08:20:04 from (206.71.120.1):
I moved into a farm house last year which uses hot water heat provided by an outdoor wood stove. This is an open system: the stove has a circulator that pumps the hot water to the house, and it returns to the boiler tank which is vented to atmosphere. Inside the house, the previous owner connected the plumbing to the old closed system, but bypassed the old, broken oil burning boiler. The radiators are old cast-iron, with the water flowing in and out of ports at the base of the 2' high units. We can not seem to keep air out of the radiators! I close a valve at the end of the last radiator, turn up the thermostat to start the circulator, and bleed each radiator until they are full of water. Within a day or two, we hear water gurgling in the system. I can't find any leaks. The radiators are higher in elevation than the outdoor boiler tank, so I suspected that the water was running 'downhill' when the circulator pump shut off. I added a zone valve at the end of the loop, which shuts whenever the pump stops, but it doesn't seem to make a difference. Can anyone educate me as to what has been set up wrong?
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