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A comment on Tesla’s $16k Quote for a $700 Fix Is Why Right to Repair Matters. Parent comment

Re:Tesla’s $16k Quote for a $700 Fix Is Why Right to Repair ... by devenson on Tuesday July 13, 2021 @01:13AM (#27817791)
I wonder if it's from water expanding in the hot water heater. That might be pressurizing your system after you send a volume of cold water into the heater after use. Your pressure reducer valve might be acting like a check valve preventing expansion relief into the municipal supply.
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Re:Tesla’s $16k Quote for a $700 Fix Is Why Right to Repair ... by bbarnett on Tuesday July 13, 2021 @02:51AM (#27818225)
An interesting premise, but I am on a well, have a pressure tank, and the well hose/pump has a check valve.

(Otherwise, water could slowly drain back into the well)

So think of it as a closed system, and it is a common setup, yet I have not seen this behaviour.

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