It takes a long time for hot water to come

2019-06-20 15:59:49

As mentioned, the high-power pump is included in the 600 kWh. You would have to calculate how many kWh that is, but since it is a three-phase connection, it will make a bit of a difference. Edit: our house has no hot water pipes except those from the instantaneous water heater to the user (1-2 meters). There were also no heating pipes.

Yes, you simply have an unusually low hot water consumption, you probably know the reason yourselves. How do you heat? Without central heating, it's something different as well. If the consumption stays that low, the savings potential is probably indeed too small to have justified the new construction of a central solution.

2019-06-20 16:16:08

Currently, we are still heating with a wood stove. We had a brand new pellet boiler and a buffer tank installed in 2014. However, it is still not in operation because the corresponding heating surfaces are missing. We cannot find a heating engineer who will install and connect the underfloor heating for us. No one comes for less than 100 m2. But I cannot provide that.
So, it's just the wood stove for now. Until we install the underfloor heating ourselves. But since I hardly dare to tackle it, that will probably take a few more years.
Previously, there were night storage heaters installed.

2019-06-20 20:40:38

To all instantaneous water heater users: How is your hot water comfort? For example, do you get a tub full of evenly warm water? What happens when one person is bathing and another wants to do the dishes or when warm water is needed at multiple consumption points?

We have been living with an instantaneous water heater for almost 10 years and it is a disaster. Even a new IWH (also electronic from Stiebel Eltron), which we have had recently, does not meet the above requirements. It was installed by a professional who also advised me against hot water preparation via instantaneous water heater for the house construction.

2019-06-22 20:03:22

So, we don't have a bathtub. Only showers. If one person is showering and the other turns on the faucet, you can definitely notice it. The water pressure drops, not by much, but you notice it. The temperature stays the same though.
If it's that bad for you, I might consider giving the sink its own instant water heater (under-sink units for the power outlet). Lukewarm water is sufficient there.
However, the phenomenon also occurs for us when only cold water is turned on. Maybe the supply line is simply not adequately sized.

2019-07-12 14:09:53

To all instantaneous water heater users: how is your hot water comfort? For example, do you get a bathtub full of evenly warm water? What happens if one person is bathing and another wants to do the dishes or if warm water is needed at multiple consumption points?

We have been living with an instantaneous water heater for almost 10 years and it is a disaster. Even a new instantaneous water heater (also electronic from Stiebel Eltron), which we have had for a short time, does not meet the above requirements. It was installed by a professional who also advised me against hot water preparation via instantaneous water heater when building the house.

We have a 27kW instantaneous water heater from Stiebel Eltron. A bathtub full of hot water is no problem. If you turn on the hand water tap at the same time, the water pressure naturally decreases. But we are satisfied with it. Previously, we had a huge hot water boiler hanging in the bathroom. Now we have much more space. How much output does your instantaneous water heater have?

2019-07-12 15:52:42

We have a 27kW instantaneous water heater from Stiebel Eltron. Filling the bathtub with hot water is no problem.

So that's no feat at all. There's enough power, and the temperature of the flowing water doesn't change. You could even fill an entire swimming pool with it.
It just uses a lot of electricity, which is why it's uncommon in new buildings.

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It takes a long time for hot water to come

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