Shower toilet: electricity or hot water

Hello, I just registered. What is normal in Japan is just beginning to "take hold" in Germany, according to my observation: the toilet with bidet function. I have an Axent.one, am completely satisfied with it, and would like to advise friends to get one as well. Meanwhile, two years have passed and there are more companies offering similar products. The question that now arises for me concerns the warm water. My toilet has a power connection and heats the water with a mini instantaneous water heater. It takes about 3 seconds until the temperature at the butt changes from cold to warm – which is okay. Tece now has one, the Teceone, which works with the warm water from the house supply, so it does not need electricity but requires a hot water connection. In principle, I like that better than the instantaneous heater variant, but in the house in question there is no hot water circulation system. The water remains cold as long as it takes for the water to flow from the hot water tank to the outlet. In this case, that distance is extremely short – about 2 or 3 meters – but since not much water runs through such a "butt shower," it will take significantly longer than 3 seconds. In my "Axent" there is a flushing function for the "spray nozzle," which extends where water is already flowing before the cleaning spray starts. If this function were also present in the "Tece" and thus already sent the warm water "on its way," I could imagine that it would be okay. But I can think a lot – and wish even more – but what then "comes out the back" (no: ARRIVES), no one can tell me for sure who has not installed and tested it... Or? I assume that only few people in the world can relate to this question and would therefore be all the more happy about "well-founded feedback."

I don't know the "Tece" but this flushing function of the trunk is standard, isn't it? I also see a hot water line as a worse option compared to a small instantaneous water heater. Either you need permanent circulation or you first have to use the cool water from the line. With the low consumption amounts, it probably won't even get warm... The Tece extends the trunk due to the water pressure. Therefore, you will certainly have cooler water at the beginning. Meanwhile, there are many manufacturers. Most big ones buy components from the market leader Toto. I would rather rely on one like that.

The Tece extends the nozzle due to the water pressure

True ... I hadn’t thought of that yet: The part has to move - and not just "out", but also "back".

"Flush function is standard"?
No idea, but probably yes.

Which manufacturer is (for now) not so important to me. For me, it’s mainly about the water temperature at the butt when no electricity flows - and there I am bracing myself for the worst unless someone convincingly convinces me otherwise

we have the TeceOne. when the circulation pump runs it takes maybe 2 seconds until warm water comes. You can slowly turn on the tap so the pressure is not yet strong enough for the water jet to reach high. After 2-3 seconds turn it on fully, then warm water comes directly to the bottom. The circulation pump is always on in the morning, outside this time I give the activation command via the tap (turning on hot water once briefly). The advantage of the Tece is that basically nothing can break because it is essentially nothing more than a faucet.

ahh ... thanks for the info. I have no circulation pump ... I mean: none at all, not just non-functional ... The hot water tank is indeed very conveniently located, right next to the toilet, but it’s still 2 to 3 meters of piping. I am in the process of giving up the basically clever "without electricity" option ...

Right now I'm dealing with a possible circulation pipe that transports the water faster to the backside.
I rejected it during construction because my idea was: You just have to wait a little longer for the warm water, but you don't constantly use unnecessary energy and don't heat the house unpleasantly in the summer...

In the meantime, I find out that there are many conflicting arguments for and against it.

One reason I'm thinking about it is that the waiting time for warm water is longer than I expected and than is comfortable.
(my research concerns my house and that of our neighbors, so they are somewhat different)
My hands are usually already washed with cold water long before the warm water arrives.
(I measured 4 liters earlier)

That alone wouldn't be so bad, but the fact that the warm water then cools down in the pipe without anyone benefiting from it, I do find annoying.

You have to estimate every time before drawing water whether it will run for a short or longer time and decide either for warm... or cold.
This bathroom is used almost exclusively by my wife and me, but still...

... and while searching for the ideal solution (found none that could still be usefully implemented after construction) I came across the legionella, which are difficult to avoid both with and without a circulation pipe.
The disease caused by legionella is rare but can certainly be deadly...

A heating to 70° in the pipe, deadly to legionella, can be "easily" achieved with such a circulation, but that has other disadvantages again.
For now, I have no plan except: leave everything as it is and assume that nothing will happen.