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We are in the middle of remodeling our house. The water pressure in the bathroom is low but at the outside back faucet it is very high. The shower head doesn't have enough pressure to run it correctly. And the pop-off valve on the brand new water heater is leaking every time we run hot water. Any suggestions what may be going wrong and how to fix it?

closed as off-topic by isherwood, Daniel Griscom, ThreePhaseEel, Machavity, Chris Cudmore Jul 5 at 20:46

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Not enough information was provided to answer this question accurately. Please include the make and model of all devices and equipment, photos, diagrams, drawings, and any other information that might help people provide an accurate answer." – isherwood, Daniel Griscom, Machavity
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  • Is the back faucet supplied before a pressure regulator and the rest of the house after? have you checked the pressure regulator setting - if fitted? can it be turned up? what diameter pipes feed the shower from source and how long is the run? – Solar Mike May 20 at 15:38
  • Voting to close. Not enough info and OP hasn't been back. – isherwood Jun 19 at 18:13
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You possibly have galvanized steel pipes which when replaced with PEX or copper would fix your low water pressure. I'm not sure why galvanized steel was ever used for water pipes, but you can use a magnet to tell if they're steel or not. Other than being a different color than steel, copper isn't magnetic and steel is magnetic.

Your T&P valve on your water heater will leak for 3 reasons. 1 if the pressure is too high, 2 if the temperature is too high, or 3 the valve is failing.

Reason 1, your pressure too high, can be corrected by adding an expansion tank to your hot water line. Water expands when heated, and it needs somewhere to go or it'll build up a pressure much higher than your normal water pressure.

Reason 2, your temperature is too high, can be corrected by turning down your water heater temperature. The US Department of Energy recommends as low as 120F, 140F is the most common, and it really shouldn't ever be set higher than 160F because the scalding/burn risk is extremely high at that temperature.

Reason 3, your T&P valve failed, is unlikely since it is new. Typically they fail where they never seal or never open. So it leaking only when the heater turns on makes it more likely to be reasons 1 and/or 2.

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    Regarding sentence #2, because at one time copper was extremely dear (due to wars 'n such) and PVC hadn't been invented or approved for plumbing. – isherwood Jun 19 at 18:13

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