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State PRX 40 gas water heater


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2 replies to this topic

#1 jb8103

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Posted 06 January 2011 - 09:26 PM

We're checking mechanicals in an older home. We went to drain the water heater to check for sediment. Shut off the gas, shut off the cold water intake, opened a nearby hot water faucet at the laundry sink, attached a hose, and opened the drain valve. The water came blasting out like a fire hydrant. I had to turn the drain valve in to calm things down. The faucet in the laundry sink kept running at normal pressure, turning to cold water after a few seconds, but showing no signs of drop in pressure.

Is this typical? I was expecting a fairly-low pressure flow from the drain valve, and also that the faucet flow would taper off to practically nothing after a minute or two.
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#2 RegUS_PatOff

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Posted 06 January 2011 - 10:23 PM

is there an Expansion (pressure) (5 gallon?) Tank on either the Cold Water input or the Hot Water line ?
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#3 jb8103

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Posted 06 January 2011 - 10:34 PM

is there an Expansion (pressure) (5 gallon?) Tank on either the Cold Water input or the Hot Water line ?


Nope.

Never seen one except on hydronics systems, but then, I haven't seen much at all in this business.
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