Peerless Boiler Help

junkjonMarch 10, 2011

We have a 4.5 year old house with an oil fuled Peerless WV-05 boiler in a hydro-system. Despite the relatively young age, we seem to be haviing problems such as needing to replace the anti-freeze (there is an air handler in the attic) and now with water coming off the overflow valve, we re being told the expansion tank is likely at fault and needs replacement. We were told both anti-freeze and expansion tanks last 3-5 years. Does this make sense? I feel like I m getting taken. In our old house with a gas boiler, we NEVER had ANY problems. We have well water which is now chemcally purified and filtered so maybe that was the pblm early on before treatmen? Very frustrated...any help/comments would be greatly appreciated.

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I'm not positive about the antifreeze. It may have a lifespan and you could find that out on Google. However, an expansion tank can last 100 years or 100 days.

To check the small diaphragm tanks, the system pressure is reduced to zero. A bicycle valve is then placed on the valve on the bottom of the tank. It should read about 13 pounds. If not, add air. If the diaphragm is broken, there will be water in the tank beneath the diaphragm and it will slosh around. If your relief valve is blowing off, you could have a leaking pressure reducing valve, a bad expansion tank, or a pinhole in a domestic water coil.

Ususually a pinhole in the coil or leaking pressure reducing valve will cause the pressure to rise and blow off, even when the boiler is cold. You should be able to isolate both of these and see if the pressure stops climbing. Isolate your cold water supply to the coil and boiler and let it sit overnight. If it blows off, it's one of those two things.

A bad expansion tank is usually associated with the boiler blowing off upon a rise in temperature. The pressure and temperature rise proportionately.

    Bookmark   March 10, 2011 at 4:12PM
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The fact that your boiler is oil fired has nothing to do with the problems. Antifreeze can last ten years if it's maintained faithfully. Concentration needs to be maintained at around 30-35% and ph at 8.5-9.0 and adjusted as necessary. Freeze protection is checked with an optical refrectometer, ph is checked with a digital ph tester for accuracy.

Antifreeze is hard on water handling components in the heating system such as valves, expansion tanks, air vents, etc.

    Bookmark   March 14, 2011 at 10:54AM
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