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120 degrees. Anything higher is a code violation and the plumber could be liable under local laws.

Correct Answer is as follows

When I work as an expert witness I ask "what is the water being used for"

Most inept people will pick a number out of the air and swear it is gospel, BUT in reality a Master plumber or Plumbing engineer will get the facts before spewing temperatures. ( I Never lost a case in 26 YEARS of testifying )

For example for nursery schools or were the elderly are going to use the fixture the temperature shall not exceed 105 DEG F

In a commercial application the water temperature shall be 160 -180 DEG F in lieu of chemicals for sterilization

Water @ 120 degree's F will not kill bacteria and can actually lead to water borne diseases to incubate inside a heater that is set so dangerously low.

Knowing the facts then giving an answer goes a long way rather then taking a shot in the dark.

Ideally a legitimate Master plumber may suggest a heater capable of putting out 140 degrees F (non commercial) and have this water go to dishwashers and washing machines to make sure bacteria is killed inside the supply piping to the appliances / fixtures

Then install a decent quality tempering valve and temperature pressure regulated faucet /shower body to prevent scalding.

Also when quoting a "code" it is nice to know which code as there are board of health codes , ADA codes, plumbing "codes" and applications that require someone to think out side the box

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14y ago

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