ᐅ Heating, Garage, Frost Protection

Hello forum members,
I would like to hear your opinions and recommendations on how to keep my garage frost-free.

I am from Lower Saxony.
The garage is about 30 sqm (320 sq ft) in size.
The walls are 17.5 cm (7 inches) sand-lime brick with exterior facing bricks.
The roof is a standard flat roof without insulation.

Using a gas heater or wood heating is not an option because, in case the garage is ever used for gatherings, I would prefer to heat safely with electricity.

I am considering mounting either a fan heater or a convector heater on the wall. Is 2 kW sufficient?
Or do you have other suggestions?

I would just say expensive fun, and 2 kW is not enough.

@Henny0710

Why does a garage need to be kept frost-free? There are frost-resistant water outlets after all.

Dry cold is not a problem, just ensure good ventilation and that's it.

I actually think heating is more counterproductive...

It looks like only a wood stove will be sufficient. An electric heater with 2 kW is not enough, and 3 kW is also insufficient. I know this "unfortunately" from experience during construction; our garage is similar, but our walls have an insulation layer behind the brick cladding. Using a gas heater introduces too much moisture into the room.