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Old 07-21-2016, 05:13 PM   #11
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The hot water heater feeds the toilet indirectly. Search my posts on the Georgetown forum as I don't have time to explain right now.
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Originally Posted by Paul S. View Post
What if your system is charged and then you disconnect it. Then you try to flush the toilet. With any pressure left in the system and 10 gallons of water in the heater I think the heater will back feed the cold side and push any sediment to the open valve. Does this make sense???

Another poster responded saying it might be "plausible."

Here's my take:
Unless the WH is very close to the toilet, there's bound to be several feet of hose between them. Water is essentially incompressible, so the volume of water required to back flow and drop the pressure is relatively small. I don't believe the cold water line is attached directly at the bottom of the WH tank. "Stuff" usually lays on the bottom of the tank, so I think it's unlikely (but certainly not impossible) for enough stuff to migrate far enough back into the cold water line to ultimately get to the toilet.

But if the OP thinks this might be part of the problem, drain and flush the WH, then flush out the line the toilet, and you should be OK.
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Old 07-22-2016, 07:59 AM   #12
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I found my post and copied and pasted the text here;

Actually your toilet is fed through the hot water heater. My theory is that when your water system is fully under pressure and you flush the toilet the drop in pressure is not fully compensated for from your outside water supply source. Given that there is 10 gallons of water sitting at a higher pressure in your hot water tank the heater back feeds into your cold water supply line carrying any sediment or debris from the decaying anode. This sediment will pulse along each time the toilet is flushed until it gets caught in the screen of the flush valve. Also, the flush valve and the heater are roughly in the same horizontal plane compared to the sinks and the shower. This is why these tend to not get as much sediment as the flush valve. Hope this clears things up.
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Old 07-22-2016, 11:10 AM   #13
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Quote:
Originally Posted by Paul S. View Post
I found my post and copied and pasted the text here;

Actually your toilet is fed through the hot water heater. My theory is that when your water system is fully under pressure and you flush the toilet the drop in pressure is not fully compensated for from your outside water supply source. Given that there is 10 gallons of water sitting at a higher pressure in your hot water tank the heater back feeds into your cold water supply line carrying any sediment or debris from the decaying anode. This sediment will pulse along each time the toilet is flushed until it gets caught in the screen of the flush valve. Also, the flush valve and the heater are roughly in the same horizontal plane compared to the sinks and the shower. This is why these tend to not get as much sediment as the flush valve. Hope this clears things up.
Don't mean to be contrary, but that is simply not the case. The cold water only feeds the water heater and when there is a drop in pressure the pressure drop is constant throughout the system including the water heater. It doesn't migrate from the hot supply line from the heater to the cold supply.
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Old 07-22-2016, 11:20 AM   #14
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Don't mean to be contrary, but that is simply not the case. The cold water only feeds the water heater and when there is a drop in pressure the pressure drop is constant throughout the system including the water heater. It doesn't migrate from the hot supply line from the heater to the cold supply.
Ok. So what is your explanation of the anode material clogging the flush valve?
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Old 07-22-2016, 11:23 AM   #15
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Paul,


With all due respect I still disagree


Further, I believe I am in a better position to disagree because of two points:
1. I am a former owner of a Rockwood 8289WS
2. I have been to the Rockwood plant and have seen the units built; there is a single cold water PEX line feeding the toilet.


Not saying that the HWH does not feed the toilet in a Georgetown, but at least in my 2013 and the 2014/2015 units I saw built it does not.


And, on a Berkshire I can categorically say this is not true because we have a tankless HWH & Water manifold wet bay
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Old 07-22-2016, 11:26 AM   #16
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Ok. So what is your explanation of the anode material clogging the flush valve?
All I can say is bad plumbing.
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Old 07-22-2016, 11:26 AM   #17
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Don't mean to be contrary, but that is simply not the case. The cold water only feeds the water heater and when there is a drop in pressure the pressure drop is constant throughout the system including the water heater. It doesn't migrate from the hot supply line from the heater to the cold supply.
X2

As I stated previously, water is incompressible. So it only takes a thimbleful or so to move to drop the pressure. Not nearly enough to pull crap off the bottom of the tank and travel several feet back into the cold water line to wherever it taps off to the toilet.

But as I said, if you really think that's your problem, drain and flush your HWH and flush all the lines.
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