When I turn on the kitchen hot water, it heats up, then rattles, and the pressure cuts back by at least 50%. This does not happen with the dishwasher or the cold water. Any suggestions?
Water – Why does the kitchen faucet’s hot water line rattle and lose pressure
water
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Best Answer
If you're only opening it just a bit, then it can be thermal expansion. When the hot water reaches the valve, it can cause some component to lengthen slightly, closing the valve a bit more than it was.
I've seen that exact behavior on bathtub valves as well. If the behavior is new, it could be that a washer is staying compressed when cold and is expanding only when it gets warm. If so, replacing the washer may change it up.
Does it cut back 50% if you open the valve all the way, or only if you open it a "normal" amount?