Quote Originally Posted by johnboy View Post
Oops!
Mea culpa!
We're talking at cross purposes here...here in New Zealand water heater tanks are thin-walled copper tanks with a pressure reducing valve between them and the mains system, designed for quite low pressures.
What you call a water heater tank is what we refer to as a water pressure cylinder, a different beast entirely.
I wasn't meaning to denigrate Mike P; the different names for different style things had me fooled.
Not a problem Johnboy, just a difference in terminology due to what's "normal". Your "water tank" is what we call an on-demand water heater, or a point of use water heater. Most of ours are still the upright tanks surrounded by insulation, etc. I did not intend to generate any bad feelings in my response, either - all in fun.