This would depend on the temperature of your hot water feed, which is likely much lower.

It’s like having a speedometer in your car that goes to 180 mph.

I was off by 6 degrees (looked lazily at axis labels, not at the actual data). But the OP actually measured the temperature. It says, right in the article:

> The minimum temperature was 44.4°F (6.9°C) and the maximum temperature was 134.1°F (56.7°C).

So yes, this shower violates the code.

> So yes, this shower violates the code.

Again, the shower is not the only one dictating how hot the water can get, the water heater does as well. Turning down the temperature on the water heater will make the max temperature of the shower also go down, vice-versa if you put up the temperature in the water heater.

Could be that they just run their water heater really warm, some people seem to do.

You can't turn down the water heater by much, the temperature is usually kept at around 60C/140F to prevent bacterial growth.

Also we have body sensors which detect acute over-temperature situations and cause us to remediate the situation before damage can occur. Usually while screaming something profane.

In case you have never been in a slippery shower or encountered anyone with one of many possible disabilities, excessively hot shower water is a genuine hazard. For example:

Slow reaction time (you can get burned very quickly by excessively hot shower water)

Limited sensation in some part of one’s body

Balance issues or movement issues.

Anything preventing one from getting to the control or out of the water very very quickly.

A shower delivering 134F water is hazardous and serves no purpose.

Who goes into an unknown shower and doesn't start out with the control at the cold end, slowly increasing it until the water is hot enough? That's like getting into a car you've never driven before and giving it full throttle right away.

A shower delivering 134F water is hazardous and serves no purpose.

It does if you want to clean something other than your body in it.

It also depends on the temperature of the cold water being mixed in.

It really shouldn’t be, at least for homes where the owner gets to choose.

Being able to set you water temp extremely hot makes your hot water last longer because the comfortable water temperature is say like 70% cold, same applies for laundry.

Also consumer dishwashers perform much much better with higher hot water temp.

There is nothing wrong with setting one’s water heater tank very hot (except potential inefficiencies — there would be more loss when not using hot water, and heat pump water heater can be less efficient heating to a higher temperature). Codes allow this.

What codes do not allow is excessively hot water coming out the fixture. IMO this is the most sensible kind of code: it disallows a specific unsafe outcome. You are not allowed to build a house that burns unsuspecting users of the sink of shower.

So you can apply technology! There are thermostatic mixing valves that can be installed near your tank to serve your whole house or at the individual fixtures. They’re not free, but they’re not terribly expensive, especially if just one is used for the whole house:

https://www.supplyhouse.com/sh/control/search/~SEARCH_STRING...

That’s solved by European dishwashers. They take in cold water and heat it up themselves.

If you have any recs I can buy in the US I'm all ears. Because mine "heats up" but not enough to make an actual difference between turning up the tank heat.

That's what I thought too. Why not take the first step to reduce the temperature setting on the water heater?

Yep, my first thought was why nothing was done at the water heater level if the full-hot is way too hot.