Which are explicitly forbidden as a means of heating unvented HWCs.
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- posted
15 years ago
The unvented cylinder annual inspection myth?
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15 years ago
You forgot the mandatory overtemperature relief valve!
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15 years ago
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15 years ago
Ed just beat you to it :-)
I was thinking of pressure cooker type safety devices when I wrote that and thought it was a potential weakness not to have a backup like the melting plug that they have but it's nice to know they have it covered.
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15 years ago
So to determine how safe it is you need to know the mean time between failures of each device and the mean time to repair for the devices. Then you can work out how long a system is likely to run without exploding.
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15 years ago
depends on if they fail safe or not...
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15 years ago
I have yet to see a fail safe that can only fail safe.
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15 years ago
Read the instructions.
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15 years ago
Have an explosion or leak and the insurance company will disown you.
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15 years ago
It is. Read instructions.
I have the impression you are some sort of spammer.
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15 years ago
They all have electric immersions, which fail more easily.
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15 years ago
10kW was so they did not wait too long. It did go booooom.
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15 years ago
Quite possible on a very old neglected system. Expect many of this blows in
10, 20 years time as the install base rises.- Vote on answer
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15 years ago
Very poor science then. Should have used a standard element and waited. Heat loss by conduction *might* have been sufficient to prevent an explosion but it'll require a repeat experiment to determine that.
Tim
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15 years ago
You snipped the important bit however, which said "For a cylinder heated via a water flow from a boiler, the chances of super heating it seem minimal."
Even if that were true (which I doubt), a large proportion are unlikely to ever be heated via the immersion, given the added cost compared to doing it with the boiler.
While immersion heaters obviously can fail, it would be interesting to see how many (modern ones) fail in such a mode all the stats and overheat protections fail, and yet they still carry on heating.
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15 years ago
I am not interested in the science, it went boom. Big boom.
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15 years ago
This is true.
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15 years ago
T
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15 years ago
I think that says it all.
Tim
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15 years ago
It said boom.