"Christian McArdle" wrote in message
t...
or sensor and done with it.

Look at the DPS web site, and two stats is a common option.

He does not deny that it is sometimes done, merely that it is the simplest
option. The fact that it is an costed option, rather than standard would
indicate that it is not the simplest one.

The simplest way to improve efficiency, rather than buy an expensive
sophisticated boiler. Then there is the matter of effective making your
cylinder bigger by adding some simple controls.