:D Well Tony I think its rather obvious why they are not used so much now although you can still buy them. Almost everyone wants a combi these days when there is no need for a dhw cylinder or any make-up tanks.
Anyway I am perfectly happy with mine and I am confident that it will still be...
:D I have drained and flushed my whole system now I am back to crystal clear water. Now that I know what a primatic cylinder is and how it works, I think it is a brilliant concept - No moving parts - No header tank - No ball valve- no timber framework to support - less plumbing!!!
Would I...