Hot water cylinder temperature

[Softus]

Oh blimey - can't quite remember. Could be Magnesium.

 

[meldrew's_mate]

If you've got a thermocouple and a proper temperature gauge why not take a profile of the temperatures from top to bottom, then you'll be in a better position to judge the scaling severity. If it really is scaled badly the quantity of hot water will be reduced to less than a bathfull, and the boiler loading on the (insulated!) heating coil will be low too, all pointing towards a new cylinder requirement.

BTW I once changed a direct copper cylinder for a customer based on the assumption that his neighbour's had just failed (and was 3/4 full of scale) and his wouldn't be far behind. What I removed was absolutely scale free and shiney inside - two years previous he had bought an electronic scale inhibitor from a car boot sale.
It only shows that some of them work some of the time on some water systems. That's all.

 

[MattChan]

If you've got a thermocouple and a proper temperature gauge why not take a profile of the temperatures from top to bottom, then you'll be in a better position to judge the scaling severity. If it really is scaled badly the quantity of hot water will be reduced to less than a bathfull, and the boiler loading on the (insulated!) heating coil will be low too, all pointing towards a new cylinder requirement.

I took the immersion out yesterday and its all shiny inside! Only the heat exchanger has scale on it and even then thats not all over...

So Once I get it all back together I think I'll use your idea and do a temperature profile of the outside of the cylinder