ᐅ Air-to-water heat pump Tecalor 8.5: Warm water – not hot in the morning

ypg schrieb:

It shouldn’t be set below 55 degrees.

What are your experiences? Is it enough or not?

As I said before, the heating engineer can’t know your habits. One person showers with 36-degree warm water, another needs 42 degrees.
One spends 10 minutes under the shower, another only 2. All of this affects the storage tank’s capacity. If it’s not enough, you could always raise the temperature, e.g., from 60 to 65 degrees.

If I remember correctly, it is exactly set to 55°C (131°F) (I just checked in the heat pump menu yesterday and had a quick look around).

Basically, over the past 5 months it happened twice that I wished I could shower 2-3 minutes longer—nothing more.

It might become more problematic if there are two children involved...

In other words: If it ever leads to real “shower problems,” you could increase the temperature, and that would be a first step towards a solution?

Prager91 schrieb:

If I remember correctly, the temperature is set to exactly 55°C (131°F) (I was just looking around in the heat pump menu yesterday).

I’m not sure what type of hot water tank you have. But with standalone tanks, 55 degrees can vary a lot. This is because the temperature sensor might be placed at the bottom, middle, or top of the tank. Depending on that, the amount of water at 55 degrees in the tank will differ.

For us, heating from 6 to 50 degrees Celsius (185 liters / 49 gallons) would take 1 hour and 17 minutes.
7 kW pump with heating element
Maybe this makes it easier to understand

What type of storage do you have? How large is the heat exchanger?

And how much power does the heating element provide? Whether the heater is running at that moment doesn't really tell you much.

It's quite simple:
To raise 1000 liters (264 gallons) of water by one degree Celsius (1.8°F), 1.16 kWh of energy is required. This calculation does not account for heat loss, cooling, or other factors.
Even if there is enough power, a heat exchanger can still be a bottleneck.
Our heating system is sized very large due to the pool. When the pool is not being heated, there is enough capacity to provide unlimited domestic hot water.
We have a large buffer tank and use a fresh water station to extract the domestic hot water.

Starting hot water at 5:00 a.m. is actually not ideal. On average, this is usually the coldest time of day, meaning it naturally takes longer and consumes more electricity.
What I’m wondering is: why is the hot water already "used up" by 5 a.m.? Do you actually use it between 10 p.m. and 5 a.m.?

In the settings, there should be an option like "hot water performance summer/winter," where you might be able to increase the power. By default, I believe it’s set to 80%.
If the hot water is still regularly insufficient, as others have mentioned, the only solution is to raise the temperature.