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

Didn’t Tecalor have that strange eco-mode for domestic hot water that kind of constantly “adjusted” the hot water temperature but always stayed far below the set temperature?

A hot water hysteresis, as far as I know, is purely negative. So at 51°C (124°F) it stops, and heating starts again below 47°C (117°F).

halmi schrieb:

Wasn’t there that strange Eco mode for hot water on Tecalor that somehow always "adjusted" the hot water temperature but stayed far below the set temperature?

A hot water hysteresis is, at least as I know it, a strictly negative hysteresis. So it stops at 51°C (124°F) and starts heating again below 47°C (117°F).

Yes, the Eco mode does exist. According to the picture I attached, the Eco temperature is set to 10°C (50°F).

Since I have Comfort mode activated, this setting should apply to me as well, right?

So the pump heats down to the Eco temperature outside of the heating circuit times (for example, during the night), correct? That would probably explain why it takes too long to reach the proper temperature again, which is why I don’t have hot water at 6:30 a.m.

Heating systems are definitely quite complex… 😀

halmi schrieb:

A hot water hysteresis is, at least as I know it, purely a negative hysteresis. So at 51°C (124°F) it stops heating, and heating starts again below 47°C (117°F).

No, with the Stiebel Eltron/Tecalor LWZ units it works both ways. I don’t think it’s different with this model.

Prager91 schrieb:


So the pump lowers the temperature to the ECO temperature during times outside the heating circuit (i.e., at night), right? So it probably takes too long to heat back up, which is why I don’t have hot water at 6:30 a.m.

The heating doesn’t “cool down” 😀 Right now it just stays at 47°C (117°F) from 10 p.m. in the evening. In the morning, before it starts heating up again, the temperature might have dropped to around 43°C (109°F). Because of the circulation, the hot water tank also gets well mixed — I can imagine the water feeling lukewarm at first and it taking some time to get back to a fully hot temperature.

Anyway — I already mentioned what I would set.

debaser schrieb:

No, with the Stiebel Eltron/Tecalor LWZ units, the flow works both ways. I don’t think this model is any different.

The heating doesn’t 'cool down' 😀 Right now, it just stays at 47°C (117°F) from 10 PM in the evening. In the morning, before it starts heating again, there might still be about 43°C (109°F) left. Due to circulation, the hot water tank is also well mixed — so I can imagine it feels lukewarm at first and takes a while to get hot again.

Anyway — I’ve already said what I’d set.

I’ll give that a try too. I will definitely increase the hot water temperature setting and check what the hysteresis is set to, adjusting it if necessary.

Then I’ll see if the water is hotter in the morning. If that doesn’t help, I might move the circulation time earlier from 5:30 AM to maybe 5:00 AM. Maybe I need more buffer there?