The water should certainly be heated to at least 50C as a minimum, and this is probably borderline. This temperature tends to excite the H&S brigade as in a shower is would be borderline dangerous, and certainly quite a shock, but that is what the thermostatic controls are for (they work beautifully in my house where the hot water is 90C for the kitchen...). In a large centrally heated (Gas!) hot water system with storage tanks a low temperature is very unsafe as bacteria can easily get in somehow, probably from cold storage tanks. at 37C or whatever they multiply very rapidly indeed. In homes it is much less likely but still 60C is effective to kill bacteria, and probably should be the minimum. Combi-boiler sources and electric showers should not get this problem.
The water should certainly be heated to at least 50C as a minimum, and this is probably borderline. This temperature tends to excite the H&S brigade as in a shower is would be borderline dangerous, and certainly quite a shock, but that is what the thermostatic controls are for (they work beautifully in my house where the hot water is 90C for the kitchen...). In a large centrally heated (Gas!) hot water system with storage tanks a low temperature is very unsafe as bacteria can easily get in somehow, probably from cold storage tanks. at 37C or whatever they multiply very rapidly indeed. In homes it is much less likely but still 60C is effective to kill bacteria, and probably should be the minimum. Combi-boiler sources and electric showers should not get this problem.
