On 5 Jan 2006 06:14:17 -0800, "Russ"
wrote:

"direct" as in it's got an immersion heater only

"indirect" being the tanks with the additional connections on the side
and the coil inside, into which you'd feed water from the boiler.

All we've got is immersion heated water.

You should be fine with an indirect cylinder then, you would simply
ignore the extra plumbing for where the boiler coil would normally go.
A new one should have the cold feed from the tank in the bottom, the
top central pipe for the HW and expansion, and of course. the
immersion heater boss on top as usual.

New cylinders are decently insulated and should save a bit on running
costs.