I believe the max temp of hot water is no more than 65C, it could even be lower and from what other members have posted, no plumber will alter the settings due to the option of being fined or even sued by the customer.
I am wonder what area you live in because if your having problems now, what will it be like over the coldest months ahead.
I think thats why most Solar HW systems have some kind of 'Booster', electric or gas to overcome shortfalls in heating.
But that sort of overcomes the whole concept of Solar heating, doesnt it?
Are all the pipes going IN and Out fully insulated, very much so the Hot from the tank to the tap.
You may not think the IN cold water pipe needs to be insulated but exposure to the atmosphere can make that water colder and that means more Sun heat is needed.
Idealy a thermocouple in the tank to tell you just how hot that water is to see if your loosing heat along the pipe.
In my area I think the 'Evacuated' tube type are the only viable option for Solar HWS systems.
They seem to be successful in the northern climes but I am going to wait and see.
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