"Christian McArdle" wrote in message
et...
120 litre Telford Typhoon cylinder has: 1.55 squ metres coil surface
area.
Calculated to give 12-16 minutes recovery time.

It is a 180L, so it couldn't be a Typhoon. I'll need to examine further to
see what it might be. It could just be a standard indirect cylinder, or a
special order item for them.

Christian,

You should be able to see the coil inside the cylinder through the
immersion, or other, tappings. The quick recovery coil has about 4 soft
copper coils.


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