In a torus, the internal heater would be difficult to impossible to position correctly, i.e. in the center.
On Thu, Apr 21, 2011 at 4:34 PM, Jed Rothwell <[email protected]> wrote: > I wrote: > > >> You mean, the cell is a torus? With the cooling water flowing through the >> middle? >> > > The problem with that would be: Why bother putting the copper shell around > the steel cell? If it is a torus, you can dispense with the copper shell, > and put the heater directly on the outside of the stainless steel cell. > > In the 12 kW tankless water heater, the two electric resistance heaters > have a torus shape, with a copper pipe running through the middle. > > - Jed > >
