purchased a triton shower 9.5kw. its losing its heat while we are in the shower. one minute hot, next its cold. triton say there must be 9 litres of water goes through the shower per minute. does anyone know the setting we should test this. When we did it at number 5 we only had 4 litres then when we tested it at 0 we got 10 litres in the minute. if anyone knows we would really appreciate it as this shower is only 3 weeks old. thank you.