BenderDK wrote:and D. -if it for some freakin reason freezes, then you have 50 litres of ice, wich proberbly just ripped your new waterheator open.
This is true. Not a problem here in Sydney but in colder climes, definitely a consideration.
Oh... and Bub... Gas heaters have a shutoff valve too. At least they do here. Dunno how they hook them up over there.
I didn't go tankless... I went solar. All the hot water I can eat and the sun does most of the work.