Stay away from this system. Nothing but trouble unless you have water filtration system in place.

@@allenlarabie8854 Thanks for the warning🙏

I think the water will remain cold, because the paraffin valve will not open the part with hot water.

@@dejv1111 I’ve had this happen to me this week. It results in an either all cold or all hot situation. The valve tries to correct a too hot situation by introducing more cold, but when the supplies are reversed this adds more hot. The cycle continues until you have all hot. You then have to put the valve fully to the counter clockwise side to put it all cold which bypasses the thermostat giving you all cold.

Yes. This is the "anti-scolding" feature of thermostatic mixing valves. If there is a large water pressure variation between hot and cold, the hot water flow will be restricted or cut off entirely to prevent scolding. Flow will resume when the pressures equalise.

in my opinion it is just another thing that can brake and more expensive to replace. what is wrong with a manual mixer tap.

​​​@@mikle65 nothing if your hot water is supplied by a boiler. But flow through gas heaters are more and more common and the temperatures can be all over the place with those. Especially with a restricted flow high pressure shower head. I find myself adjusting the mixer tap several times during a shower. Let alone when someone opens any other valve in the house.

Aye, that should be more than enough.

I'm not a plumber, but I would say that a _thermostatic_ circulation pump with automatic adjustment of water temperature probably does precisely the same as a thermostatic valve, so having _both_ installed would be redundant. However, it's worth noticing that the valve uses simple physics and a fully mechanical design to replace a complex system with electric motors, ICs, sensors, and so forth - all of which can fail independently of each other :-) In other words, unless we're talking about a _really_ long pipe to provide hot water at an extremely distant point, my guess is that the thermostatic valve, by itself, would be a much simpler solution; the circulation pump, by contrast, would give instant (or near-instant) warm water on demand on such a long pipe, while the simple thermostatic valve wouldn't. On the other hand, why waste energy (in heat) for such long hot pipes? It would make so much more sense to get a boiler near the shower tap (and use only a single cold water pipe to cover the whole distance - making the installation easier, cheaper, and saving energy due to the wasted heat). But I'd say that you could have _both_ working simultaneously... there might be some use cases for such an arrangement (e.g. having a _really huge_ boiler, powered by renewable energies, that provides hot water for a whole _building_, such as a hotel).

Most new shower kits should come with one. It's almost become regulation.

It's not a bad assumption really. Many people don't know how this works.

@@darude1420 I think that what @Elizabeth meant was that the video intro is showing a woman taking a shower, and the narrator assumes that because the actress is a _woman_ she does not know how a thermostatic valve works (while the male narrator/plumber/technician is _obviously_ an expert in the subject...). So the assumption isn't 'bad' or 'incorrect' by itself; it's just that, in the way the video has been produced, the language is a bit sexist (even if that wasn't intended). The intro could perfectly show a couple taking a shower (or a group of different people from different genders, all having a shower) and say 'they have no idea how it works' - that way, sexist language could be averted. It actually takes very little effort to _avoid_ sexist implications :-) I'm assuming that the intro is made of stock footage, and you can get stock footage for any gender really, it would be just as easy to edit the intro.