My hot water pipe literally exploded. the problem was that the thermostat was set to max. temp. The service guy thought it's in the "middle" and should be OK, but I looked (afterwards) it was set to 100°C. The hose bursted at the thinnest place. I repaired it with what I had on board and ordered a new one. Be very careful and turn off the heater, the water pump and let the pressure out of the hot water (open tab in bath, etc.). I forgot all that and scalded my wrist very bad.
As described below, with no pressure in the pipe it's easy to release the pipe by pushing the white/grey ring at the fitting.
The system is very practical and easy to work with, a small saw is enough for cutting, although they offer a special cutter.