Heating screed with device vs. with heat pump: costs?

. A demand of 1000 - 2500 kWh was given to me, also heavily dependent on the weather.

Above, a demand of about 6300 kWh was stated for my project, where does the large difference come from?

How high is your screed heated? We once had a big discussion here about whether it is really necessary to heat the screed above 50 degrees when, in practice, the flow temperature is only at 30 degrees. I suspect this could be where the difference lies. However, I am also unsure because I don't yet know our planned heating program.

The calculation above is by the way a rough estimate assuming continuous full load at 19 kW. But since the temperature is increased and decreased gradually, I would rather not assume permanent full load.

edit:
I just quickly googled and found a rule of thumb of 20 kWh/sqm. That would then be about 2600 kWh for 130 sqm. Can someone confirm this who has already completed their screed?

we also have 130 sqm, but it wasn't that much. Since I couldn't check the meter readings, I would guess 1000 to 1500 kWh, but it definitely wasn't more. As I said, in Aug.20 and it was nice and warm. The screed "almost" dried by itself then.

How high is your screed heated? We once had a bigger discussion here about whether it is really necessary to heat the screed above 50 degrees when in practice the supply temperature is only 30 degrees. I suspect this could be where the difference lies. However, I am also unsure since I do not yet know our planned heating schedule

By the way, the calculation above is a rough calculation with continuous full load at 19kW. Since the temperature is increased and decreased step by step, I would rather not assume permanent full load.

edit: I just quickly googled and found a rule of thumb of 20 kWh/sqm. That would be about 2600kWh for 130sqm. Can someone confirm this who has already completed their screed?

In our new office, the landlord spoke of a 50° heating temperature. I believe it is also (or exactly?) about relieving stress from the screed...

Yes exactly, it's about the tensions. But I remember a longer thread in which it was discussed whether 50 degrees are really necessary when the heating is designed for a flow temperature of 28-30 degrees. Since you only ever adjust in small steps up and down, a 20-degree difference then means a few more days and precisely the hottest ones. But I can't find the thread quickly.

In our new office, the landlord spoke of a 50° heating temperature. I believe it’s also (or exactly?) about relieving stress from the screed...

Yep. There are two different types of heating: 1. Functional heating 2. Drying / surface-ready heating Easier than writing it myself: Although functional heating is usually still specified at +/- 50 degrees, it has become common not to go that high anymore, since normally the maximum flow temperature is around 30 degrees and the delta to 50 degrees is no longer needed. How long and how intensely to heat is specified by the screed layer.