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Dirty Steam Water in Hot water tank
Today I had a friend over to clean my glass gauge of my steam boiler.
When we drained the boiler the water was pretty dirty. I have a low
water cutoff. It refills after ten minutes, instead of waiting ten
minutes we added by by turning on the by pass valve. After he left, I
decided to clean out the water in my hot water tank, A O Smith that is
four years old. Usually, it would be only a little dirty, after half a
gallon it would run clean. This time, the water was as dirty as my
steam boiler, never seen it like this before. I connected a garden hose
to the drain and let it drain for twenty minutes. It went from dark
brown to light clear. I also let my hot water faucet run for 10
minutes. It had a little dirty water. I shut off the hot water flow to
my steam boiler for now. My question is:
How could this happen,
is it possible that the hot water heater sucked water from my boiler?
Negative pressure? Is there a way to prevent this? This is the first
time I've seen this. I added a picture of my system.
I appreciate the advice.