Pellet boiler, Viessmann domestic hot water pump, Eta funding package, 25kW

Hello, our heating specialist gave me an offer today for an Eta pellet boiler.

Our house was built in 1965 and has about 200 sqm of living space; it is still to be insulated from the outside with about 10 cm. He gave me an offer for the following heating system.

The Eta funding package consists of:
Eta pellet boiler 25 kW
Buffer storage tank 875 liters
Pneumatic discharge system for pellet storage with 3 suction probes

Since unfortunately no solar system is possible on our roof, the neighbor’s roof casts a complete shadow on ours.
As an alternative, he offered us a domestic hot water heat pump from Viessmann Vitocal 160 a.

What do you think of this setup? I find 25 kW a bit much?

What do you think of Eta in general?

Thank you in advance.

Pellet does not make a very big difference compared to oil or gas. With solar thermal you would have only saved around 100-200 € per year. A heat pump could be more sensible here, however, with a construction year of 65, hardly 10 cm of thermal insulation on the building envelope will be sufficient. 25KW probably reflects this! Is there an independent evaluation, e.g. through an on-site consultation? Was the heating load calculated according to EN 12831? Best regards