The new water heaters sold here in NY for residential use will have a "stop" on the thermostat to prevent people from raising the temperature above the scald temperature....140 degrees F.
One can easily defeat the stop, but why do that? Especially if you have children in the house.
My understanding is that 140 degree water will scald in around 5 to 7 seconds. Les
For the Americans on the board that means 70C = 158 Fahrenheit & 65C = 149 Fahrenheit.
That seems still too high & could increase maintenance. 130 max with 115 min makes more sense. It seems like the quality of the soap could be a factor as far as the cleaning quality with lower temps.
i'm still learning in this industry, so my observation of mine was that seem to be too hot.
but the water guy, from the company, said that most self-service laundries have on 70C and being at 65C for mine would mean that i'm on the low side. my repair guy and the distributor's rep, also said 70C is the standard in my area.
perhaps different temp setting base on your earth's location?
I was installing an additional expansion tank yesterday and let the pump run too long. The temps spiked at 170 and all my TNP valves opened. Now that is hot! Normal temp after running the pump 2 minutes 120 ish.