Re: C
50 litres a minute? Wow. The Australian nanny-state seems to have limited most of the pumps I've used in the last couple of decades to about 20-30 lpm at most. Can't find any supporting requirement (e.g. Wikipedia lists US as limiting to 10Gpm or ~38lpm, but nothing for AU).
Certainly makes filling a 90L tank in 40C temps a bore.
Biting the hand that feeds IT
