They exist, but in my experience are unnecessary. Just adds another component that can break, and saves less water than simply not flushing.

UK has those too (is there a European directive for them?)

In almost all cases they are shoddily built and break really easily. I miss a proper metal lever based flush.

I've found a toilet requiring 4 or 5 flushes before things move. Otherwise they just go merilly around in circles. It has 2 buttons, and a message to push the right button and save the planet.

If there exists a hell for toilets, that one belongs down there.

That's another thing Australia one-ups us on; the toilets are vigorous.

None of this slow swirly watch it spin away shit; it's more like an airplane toilet in aggressiveness.

They're washdown toilets. https://www.ortonbaths.com/siphonic-vs-washdown-toilet-bette...

Ah, thanks! When I remodel I know what to look for.

You can buy toilets and toilet "tanks" that are pressurized. They are incredible and probably can use less water.