With direct electrical heating one saves typically 10 % by lowering from time to time home temperature, and even more if one does that more actively. In addition, the system saves automatically typically another 10 % by avoiding hours with high electricity spot prices and using those with low prices.
The total savings are also with direct electrical heating at least about 20 %. That corresponds to about 300-500 € annual savings in e.g. a detached house with annual consumption of 18.000 kWh, and correspondingly more in a bigger house. For underfloor waterborne heating the saving is about half of the above.