We are busy extending our house by adding two bedrooms and a bathroom to our existing 3 bed two bathroom house.

The new extension is quite far from the existing 200l solar geyser, so adding its own water heating makes sense. The new bathroom will see very limited use, but it would still be nice to have hot water available at the drop of a hat when needed, without having thrle geyser on all the time.

I never owned a on-demand gas geyser, but at every single guest house or holiday resort they had these the experience has been horrible. They ether don't have enough warm water to shower or the wind blows out the flame 5 times during a 10 minute shower going from warm to freezing water in a second.

Would a small electric geyser warm up in reasonable time and stay warm for two or three consecutive showers?

How well does those 25l interior geysers work?

Any advice would be appreciated.