Long waiting time until hot water arrives

I would never build without a circulation pump. Didn't even know that is still offered. Ours is learning and costs about 12 euros in electricity per year and easily saves that amount in water. Not to mention the comfort.

Yes, plus additional effort for installation and material costs. It's just a comfort thing. But that is already covered by the OP. The only possibility would probably be a small electronic instantaneous water heater..

We have a circulation pump and are very happy with it. Our pump is off from 11:00 PM to 6:00 AM. Between 6:00 AM and 11:00 PM it is on when someone is present (detection via phones in the WLAN -> switching KNX).

As a subsequent option, I only see a small instantaneous water heater.

Possibly a bit off-topic:
Regarding the costs of circulation pumps, I have read that the electricity is initially cheap (assumed 12€/year as written by ). However, the hidden costs lie in the hot water preparation for this circuit, which should be many times higher (depending on the system used). I hope the experts here in the forum can confirm/disprove this?

Best regards

Hope the experts here in the forum can confirm/debunk this?

VG

I'm not an expert, but:
-the few meters of pipe probably release less energy through the insulation than an equally long piece of underfloor heating loop, even if this is colder. You might have roughly 25 meters of the Z-line in the house, but rather hundreds of meters of underfloor heating.
-the energy stays inside the house, so it is not necessarily lost (except in summer)

Well, I also couldn't imagine building without circulation. We also have a dishwasher and washing machine with a hot water connection, so it was sensible just for that alone, not to mention the comfort when showering.

It is correct that the circulation also loses heat in the pipes. However, this heat is not lost in terms of the closed envelope (house) but instead may warm other rooms (theoretically). To make it short: price-wise, it is more or less neutral with slight disadvantages. It is more a matter of comfort. In the end, the cost is not particularly high but it does bring some benefit. If the new building has just been handed over, one can still file a defect notice based on the mentioned DIN/VDI and demand compliance. In our case, discussions had already been held with the tile installer from [sanimann] because they wanted to tear up the entire hallway. The regulations are not there out of boredom. 25 seconds until warm water arrives is simply a planning/execution error and thus a defect. Either the pipe was not laid as the planner calculated, or the pipe diameter is too large, or the planning was already wrong - at best, there is no planning of the hot water pipe at all. Always remember: you are building a modern house and for example, you can never get warm water in the kitchen because you only need 2-3 liters for the pot but warm water comes only after 4 liters. That is completely absurd...

With minimized pipe lengths and optimal pipe diameters, a circulation pump is usually not necessary. Ideally, the bathrooms are located directly above the boiler room, then for example 5-6 meters of water pipe are sufficient. With the diameter and flow rate, everyone can then calculate for themselves how long they have to wait for hot water.