We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "The Medway Handyman"
saying something like:


AIUI the 24"/27" does the heavy lifting & the 11" is just a top up. The 11"
one won't heat enough water fast enough for most domestic applications.

I have a pair of 3kW 11"ers, so they're as good as the long jobs.