"Christian McArdle" wrote in
. net:


By all means fit a replacement gravity system if you want to save
cash, but a mains pressure system is vastly better and weighs less,
too, which can be a factor when installing in a loft with 3 inch
joists.

What's this "lighter" Christian?

I admit I haven't done any homework, but as you appear to be knowledgable,
I might as well just ask!

My impression on just looking a t them, was that you would have to store a
lot of water at a high temperature to get the heatbank effect, and they
certainly *look* massive.

Was that wrong? (I'm still making up my mind on my own replacement)

mike