Rank: Forum user 
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Hi Is there any guidance to estimate the temperature of hot water within a cylinder / calorifier by taking the temperature of the tank casing?
If the tank casing is, say 55 degrees, what temp is the water within likely to be inside?
I would imagine there will be a drop in temp (the water being higher than the tank casing) but of how many degrees, I don't know. If there is a reliable source I can cite, that would be even better
Thanks in advance
David
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Rank: New forum user 
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Hi David Try here - https://www.hse.gov.uk/pubns/books/l8.htm I believe that you are supposed to check the nearest point to the calorifier, ie the piping from the calorifier to the Sentinel outlet. Use a contact thermometer, if i remember rightly the readings should be 60 degrees as they leave the unit.
Regards
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Rank: Forum user
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Thank you. I have used a contact thermometer at the outlet, but there will be a difference between that temperature and the temperature of the heated water. There will be a correction value, albeit 1 or 2 degrees, perhaps more, between the contact temp and the actual water temp
Regards David
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Rank: Super forum user 
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I don't see that it would be as simple as a correction value. The difference between the temperature of the water and the temperature of the outside would presumably depend on several factors such as the air temperature and ventilation.
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 1 user thanked Kate for this useful post.
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Rank: New forum user
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If you take the reading at the earliest possible point of its exit from the calorifier, then you have a pretty accurate reading of the tanks contents. The variances over this small distance would be almost insginificant i believe. I literally take the reading by contact with the outlfow pipe as it leaves the tank. I dot think there is an easier way to get a more accurate reading which is i believe the temperature for calorifier is set slightly higher than at outlets.
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Rank: Super forum user 
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Imagine the thermal energy loss on hot water tank casing itself that has an external temp almost matching its contents!
You're right that the contact temp on a pipe etc. is not likely to be a direct measurement of the water temp but that's quite different to a tank which is presumably insulated etc. to minimise heat loss. With that in mind, you're unlikely to find a reliable correction factor for this. With some experimentation at a local level you might be able to match up tank contact values routinely with flow values I guess? But if I was measuring 59 degrees on my pipe outflow temp, I wouldn't be stressing too much about proving it was actually 60 inside. Most legionella bacteria would just perish slightly slower even if it was accurate.
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1 user thanked Xavier123 for this useful post.
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