Hi,

On 31/08/2015 12:14, From HK wrote:

Old domestic plumbing features a hot water storage tank (aka cistern, aka
cylinder) - often located in an "airing cupboard" where clothes are dried.
A place that is constantly warm and hotter than anywhere else in the house.

For more detail of the engineering see:

http://aphc.co.uk/UNDERSTANDING%20HOT%20WATER%20SY…

--
David Pilling
http://www.davidpilling.com/
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