Air-water heat pump current consumption and data

I don't understand that, because if the heat pump is set to a spread of 5K, but the underfloor heating only delivers 3K, then the heat pump automatically throttles the flow, right?

Probably yes, in your case. And that makes it less efficient.

I meant to leave out the buffer and go directly into the underfloor heating with a 3-degree spread. Then with a high flow rate (whereas in new houses it's more like 30 in and 26 out).

The heat pump would still throttle down regardless of whether I go directly into the underfloor heating or into the buffer tank!?

The heat pump would still throttle down, regardless of whether I go directly into the underfloor heating or into the buffer, right!?

But the control variable would then be the return flow from the underfloor heating and not the return flow from the buffer. This makes the control more effective and the system more efficient. You save energy for a circulation pump and have no energy loss in/through the buffer.

Why do you always hang on to the values of the spread and the flow rate.

Only 3 values are decisive for efficiency:

Achieved room temperature
Achieved supply temperature
Achieved runtime to a lesser extent

Example:
If you achieve the lowest supply temperature and the longest runtime at the desired RT with a spread of 2 K, then that is the best value.

If you can only achieve the values with a spread of 7 K at a shorter runtime, then that is the best value.

There is no best spread.

Now I have a spread of 4.8K. At 0 degrees, the spread is 6K. Run times are fine. Compressor starts are fine too. I would like less spread but the consumption is fine and that is the most important thing. I’m not interested in anything else, especially because no one is celebrating :cool:

the heat pump would still throttle down, no matter if I go directly into the underfloor heating or into the buffer tank!?

And? Then the heat pump just throttles down. But as others also write, ONLY the heat pump. No buffer tank, no second pump, no second circuit. Everything is simple to control.

In principle, it is like with any other device. Almost everywhere you have only one motor driving a system. Whether in the stove, in the car, in the refrigerator, in the air conditioning. As soon as you have a system A on which system B is built to deliver a performance at C, it becomes a) inefficient and b) always challenging to control. You can see that in your case.