m Ransley wrote:

Not only no standby loss...

I have the impression that lots of tankless heaters
keep a small part of themselves warm all the time.

...I recently removed a tank in my apt building on relativly soft water.
There was 14" of scale in the tank, now that kills efficiency.

That wouldn't change the efficiency of an electric heater.

Tankless dont loose efficiency as tanks do.

They never scale?

Nick