this post was submitted on 02 Mar 2025
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That graph is getting dangerously close to becoming a political meme, given current events
Joke aside, get a thermostatic mixer. It can even save you water and money by instantly getting the right temperature water instead of standing outside naked for minutes juggling with a settings, while the water is on.
Is there such a thing like a thermostatic mixer with "two profiles" (one for me and one for my wife)?
Most thermostatic (non-digital) mixers can be calibrated to a single "default" temperature, but you still have the option to increase/decrease.
I have experience mostly with europen models, where the default is usually around 38-40 celsius, but you can still adjust it about +/- 6-8 degrees.
There are some fancy digital showers with multiple user profiles, but I personally would never buy anything electronic in the shower. It never lasts in my experience.
They always have a temperature knob and a flow knob. Just set the temperature to whatever you want for your shower, it's not really that complicated
I know this is a joke, but usually it's caused by old cartridges. If you replace the valve cartridge then it will probably mix better. This is usually from old/bad seals. This is why new valves mix fine, but as the seals age, mixing performance gets worse.
Pulling old cartridges can be a pain in the butt so probably best to call a plumber if you don't like diy adventures.
This advice only applies if you have inkjet showers, this isn't an issue if you have a laser shower.
Laser showers sound like the coolest fucking thing ever
Mine works just fine unless I fail to pay my monthly subscription.
I still have the old matrix shower, works just fine! Don't mind the burns on my back
Isnt it also a basic issue of temperature ranges?
First of all, the comfy range for humans is small and it is not even. E.g. most people will find around body temperature of 37°C nice. But 5 °C above that is burning hot, while 32°C is more lukewarm, than cold.
Then the cold water temp is probably between 10 °C and 15°C depending how long it stood. Same of the hot water temperature, where the first bit in the pipe is more like 20°C and then the boiler comes pushing 60°C in.
So the temperature range that gets mixed changes drastically in the beginning and small changes can make for a large difference in the "center" of the mixing, which is also where the comfy temperatures are.
My apartment is 1 year old.
Contrast the houses around here which pre-date the Great War and tell me why their water works well and mine is this binary pain.
They have two separate taps, though, but that shouldn't matter. Right? Right?
Are you new to separate taps? I'm assuming you mean one hot one cold. I turn on hot halfway then turn on cold like a quarter of that. Then mess with the cold only from there Hope that helps!
This type of control is known in industry as "bang-bang control." Among other factors, it doesn't help that the delay time between twirling the control and feeling the temperature change is often tens of seconds.
I've often wondered if this is something that could be engineered correctly or is it genuinely a difficult problem to solve with multiple variables (incoming water temps, pressure, etc)
In Japan, we usually have a thermostat to set the max water temperature and most bath fixtures have temperatures written on them (with a little push button safety thing to go over 40c). I don't know why it's not common elsewhere.
We have these in Europe. Ours is from Ikea and the button is at 38c. I've also seen them in holiday places in Spain. They work really well.
A thermostatic mixer is the usual solution. Set your desired temperature and the valve dynamically adjusts the hot and cold flows to produce that output regardless of input temperatures and presures.
Works great until it jams at the "instantly vaporize target" setting. Which reminds me, I must call a plumber...
I've never had this problem anywhere I live (Sweden and Japan) so I'm assuming it has to do with some kind of especially cheap fixtures?
There wasn't a very limited range on the dial in which a human would feel comfortable?
This is the dial in our current late-90's apartment (apologies for the limescale). It is gradated in Celsius
My kids like something in the mid-30's, I like just under 40, my wife like closer to 45. A pretty decent range IMHO
Was thinking on this tonight! There should be a mechanical solution. No electronics or other complications to fuck up down the road.
We're all different with comfort levels, hot water temps, flow rates, all that. We need something with sliding or rotating valves that lets us dial in a range we're comfortable with.
Set X as the lowest temp and Y as the highest. Now when you get in the shower you can spin the dial, all the way around, yet remain in your personal presets.
We need something with sliding or rotating valves that lets us dial in a range we're comfortable with.
This is exactly what a regular thermostat mixing faucet is, you can get them everywhere and they're not expensive.
My current shower is like this, especially in winter.
Water as cold as a nebula
tweaks hot faucet a millimetre clockwise
SATAN'S PISS!!!!
Isn’t it the other way around?
Better graph title: Shower water temperature by position of knob
The difference between absolute zero and the Planck temperature is less than a Planck length.