how can i turn the temp up on my main mersey super water heater?

how can i turn the temp up on my main mersey super water heater.there appears not to be any temp control
ray d, November 2008


done
You cant.The only way to get hotter water is to reduce the flow rate thro the tap.If this makes the heater go out it could be a faulty diaphragm that is perished in the water housing.

Tony S, November 2008