this post was submitted on 29 Apr 2025
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Yes, but this wastes water, so if you're trying to be green, you should be able to open up the valve to full hot.
Not only does it waste water, your shower will take longer to heat up.
Also, depending on where you live the perfect temperature changes a lot because of outside temperatures. If you use all the room temperature water in your cold lines then start pulling cold water from the outside. You're going to have to adjust it. Bigger the house, the more the problem.
But if you have to dump out your entire hot and cold lines to even begin to step in the shower, that's a ton of wasted water.
Answer is a thermostatic valve. It will just use hot water until it needs to mix in cold. If your cold water temperature changes, it will adjust it automatically. You really do pick a temperature to set the valve at, and then the handle just controls the flow rate.
The regular for a standard mixing valve is there only so you can't turn the valve to burn you. When people keep their water tanks at 160°F, a full turn to the left would be devastating if you're standing in it.
That's 70ºC, 49ºC (120ºF) is usually plenty hot enough and the recommended temperature. It can actually cause burns with long enough direct exposure at 50, 70 is madness.
In the US the standard safety temperature for the water heater is 120° F
You don't need it higher than that unless you have a small tank and use a lot of it. Tankless is 120°F.
I don't know where you got 70°C from.
You said:
That's 70ºC and I'm agreeing that it is a ridiculously high temperature to keep a water tank at. That's instant second degree burn temperatures, completely unsafe.
Ohh I see now.
Yeah 160° is too hot. But people do it. Small tank multiple showers needed. You can stretch it.
I was saying for people that have their water too hot. The regulator inside the US mixing valve has a stopper so you can't go to max hot. That's all the piece inside does, stops you from turning the valve more. Doesn't help reglate the temperature. Someone in comments said their regulator is bad and I thought it was OP.
I keep mine at 145, because I fear legionella.