m Ransley wrote:

Bosch Aquastar has many units, you can get an old pilot model if you
wish to waste energy or one of the newer models most people buy. 2 of
them require no outside electricity supply, one has battery ignition ,
which I have, and one has a mini hydro generator. I dont see any more
delay than with a tank.

No more delay? :-)

Recirculators waste energy.

The Taco system is close to the manual method, with less water use.

Nick