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I hop in the shower set it to the desired temp; all is fine for 10 mins or so. Next I hear a drop in water pressure followed by scalding hot water. I turn the shower head away from me to avoid getting burned. A couple mins later it returns to the temp I originally set! What is causing this and how do I fix it?

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    Did someone else in the house flush a toilet or use water in some way? Is this a new problem or has it alway been that way? How old is the construction? What type of plumbing material (copper, PEX, etc) – Tyson Apr 21 at 22:13
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    Sure sounds exactly like the ol' "somebody flushed" problem, barring more details. I wish we had the type of shower valves I've seen in the UK, where you have a knob that sets a temperature (not vaguely H--C, but a specific value like 35 or 40 degrees Celcius) and another knob that controls volume, which actively adjust to mitigate this sort of problem. – Ecnerwal Apr 22 at 0:23
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    Are there other people in the house when this happens? Are there machines that automatically use water at a certain time? Coffeemaker etc.? If you shower same time every day, this may not be obvious. – Harper Apr 22 at 0:45
  • I rent half of a duplex constructed in 1965. Each unit has its own hot water heater, but we share a common water supply. My neighbor who lives in the other half of the duplex recently experienced a hot water heater failure. The maintenance worker had knocked on my door and asked to come in as he thought that the water main shutoff was located in my half of the duplex; upon further inspection he realized it was not. – JF Barrett Apr 22 at 2:59
  • No machines automatically use water. I shower at different times. I do not know the type of plumbing. – JF Barrett Apr 22 at 3:16

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