ᐅ Experiences with heat pump flow temperatures?

Hello everyone,

we have built a single-family house and have installed a heat pump (Nibe) with underfloor heating, among other things. Since we are currently gaining our first experience with this technology, I have a question about the flow temperature.

I have noticed that we repeatedly experience short-term increases in the flow temperature. Over 24 hours, there are cyclical rises (about 10 times) up to a temperature of 50°C (122°F), even though the current outdoor temperature is 12/13°C (54/55°F) and the flow temperature specified by the heating curve is 26°C (79°F). Of course, this leads to corresponding electricity consumption. Is this normal? I can hardly imagine that...

Could this possibly be the hot water preparation?
Set the hot water preparation to 1-2 times per day, depending on usage patterns.

Joedreck schrieb:
Could this possibly be the domestic hot water preparation?
Set the domestic hot water preparation to 1-2 times daily, depending on usage patterns.

Hmm, that might be the case, but it doesn’t quite match the analysis of the domestic water preparation. Strange.

For us, it was always the hot water that was reheated several times a day... I was also startled by the heating system when the flow temperature suddenly showed 50°C (122°F)... but in small print just above it said "Storage charging in progress"...

Our Tecalor THZ504 constantly displays "confusing" parameters on the screen, especially regarding the temperatures. The Stiebel Eltron technician explained that these are "internal" sensors and do not reflect what is actually happening inside the system.

We have now installed a thermometer on the supply line, before it goes to the individual heating circuit manifolds. Currently, we are measuring a supply temperature of about 28-30°C (82-86°F) at an outdoor temperature of 5-10°C (41-50°F) ...

blackm88 schrieb:
Our Tecalor THZ504 also shows "confusing" parameters on the display, especially regarding temperatures.

Is the device otherwise working properly? Our THZ504 clearly shows the supply and return temperatures. When heating domestic hot water, the return temperatures briefly rise and the hot water symbol appears.