Underfloor heating air-water heat pump. House too warm when the sun shines

I would also like to take a look at the csv.

I would also like to take a look at the csv.

Hey, here are today's data, the compressor hardly switches on anymore, great. But unfortunately, it is still too cold in the bathroom, today at an outside temperature of -4° only 20.7 in the bathroom. The overall condition is almost at 5.5 out of 6:

Please close the bypass valve.

I have to join in here as well. After this thread made me curious, I looked at the power consumption of our WP. I was more than shocked. Equivalent to €560 for 1.5 months. Now I have adjusted the temperature to 31/21/0 and set all electronic thermostats to manual and fully opened. The consumption and cycling already went down significantly. The temperatures are also quite good. What makes me suspicious, however, is that only a few valves show a flow of around 2L, the rest is rather around 1L, and unfortunately the last valves of the underfloor heating manifold are almost at 0. One affected room is the bathroom on the upper floor. The tiles there are ice cold. How do I get more flow here?

I have to join in here. After this thread made me curious, I looked at the power consumption of our heat pump. I was more than shocked. Converted, €560 for 1.5 months. So now I have adjusted the temperature to 31/21/0 and set all electronic thermostats to manual and fully open. The consumption and cycling already went way down. The temperatures are also quite good. What puzzles me, however, is that only a few valves show a flow of about 2L, the rest are rather at 1L, and unfortunately the last valves of the underfloor heating distributor are near zero. One affected room is the bathroom upstairs. The tiles there are ice cold. How do I get more flow here?

That’s really intense, after all modifications I now have great cycling of the heat pump, thanks to the great help here. Before, I had 200 impulses per day, now maybe five. Still, I have consumed 35 kWh in 24 hours again, although the sun shone strongly for 9 hours. My bathroom is also our problem child at 20.9°C, there I even managed 3 l/min, but it still doesn’t get warmer. That can’t be right? Just increase the volume for the rooms you find too cold. Maybe it will be unnecessary due to this small modification. In my bathroom I can’t set more, 3 l is max. It just doesn’t get warmer, our heating curve is: 27.5-22-0. All other rooms are great! Or rather, our hallway is quite warm at 23°C; there I have now set a flow of 0.5 l.

In the bathroom, the limit of what is possible will have been reached. Too little heated area. You can only increase the flow temperature and throttle the other rooms again to avoid overheating there. This, of course, increases consumption.


If applicable, close the existing overcurrent valve, turn the ERR fully open, or remove the actuators, and turn up the Taco setters. If there is still too little flow in the system, increase the circulation pump.