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

debaser schrieb:

Starting the hot water at 5:00 AM is actually not ideal. On average, that’s usually the coldest time of day, meaning it naturally takes the longest and uses a lot of electricity.
What I’m wondering is: why is the hot water already “gone” at 5 AM? Do you actually use it between 10 PM and 5 AM?

In the settings, there should be something like “hot water output summer/winter,” where you might be able to increase the power. By default, I believe it’s set to 80%.
If the hot water still regularly runs out, like others have said, the only solution is to set the temperature higher.

No, actually not... We don’t use any water between 10 PM and 5 AM.

However, I think the hot water needs to be reheated repeatedly to maintain a “hot” temperature, right? The tank can’t store the heat at the highest temperature for an unlimited number of hours – or am I mistaken?

I will simply set the heating time earlier now and see if that helps.

Of course, not for an unlimited number of hours, but the temperature shouldn't noticeably drop within 7 hours. Just a few degrees at most.
Or do you have a hot water circulation system that runs during the night as well?

debaser schrieb:

Of course, not for an unlimited number of hours, but the temperature shouldn’t noticeably drop within 7 hours. Just a few degrees.
Or do you have a hot water circulation system that runs at night?

I don’t believe I have a hot water circulation pump.

Maybe it’s exactly those "few degrees" that are missing? I’ll just try a few things...

First, I’ll set the heating period cycle to start earlier, and if that doesn’t help, I’ll simply increase the temperature by 2-3 degrees.

I’ve taken some additional pictures of my settings and nameplates for better analysis.

My actual domestic hot water temperature does not even come close to 50 degrees Celsius (122°F) – that can’t be normal, can it?

According to the nameplates, my tank has a total capacity of 268 liters (70.8 gallons), apparently divided into 168 liters (44.4 gallons) for domestic water and 100 liters (26.4 gallons) for buffer storage.

My domestic hot water COMFORT temperature is set to 47.3 degrees Celsius (117.1°F). Is this the actual "comfort temperature," or is it the maximum temperature the hot water can reach? Should I set this temperature higher, above 50°C (122°F)?

It seems like I do have a circulation pump (see pictures). The setting for "circulation" is ON, so I assume the circulation mode is active?

I appreciate any suggestions for improvement!

Since my heat pump is operating in comfort mode, the comfort temperature is probably the reference value, correct? This should definitely be above 50°C (122°F), right?

Yes, I would say you need to set this "comfort temperature" higher. I would try setting it to 51°C (124°F) and adjust the hot water hysteresis (there should be a parameter for this somewhere) to 4°C (7°F).
That way, the hot water should heat up to 55°C (131°F) and start again at 47°C (117°F).

Regarding the circulation, you might also want to consider whether these times make sense for you or if they should be shortened. It does consume quite a bit of energy.