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I don't know. I went into CEF and said 'this thermostat doesn't heat the water up to the temperature I need it to', so they gave me this other thermostat that apparently would allow the water to go up to 80C. It doesn't.
I'm starting to repeat myself now, have a read of the link to HS RDT thermostats. The one in the link, has a maximum setting of 60'c. It also has a safety cut-out (which I suspect is set to 80'c). You old thermostat had a maximum setting of 80'c, and no safety cut-out. That's why when old thermostats welded closed, the water heated & circulated to boiling, melted the plastic water tank, causing 50 gallons of very hot water to spill on the occupants below. The popping noise you probable heard with your old set up, was that process starting to happen!!
Here's a picture of another make;
You will find other makes are set the same.
It may be as Tel suggested, you heater element could require changing. It could be that your hot water tank, having be set to, too higher temperature, is full of scale, leading to insufficient quantity of heated water.
Think it's time you employed the services of a plumber.