Gas Proxy Function [GPF]

Means either a SMETS1 GPF; or a Device installed (or to be installed) at a premises, which:
(a) consists of the components or other apparatus identified in; and
(b) as a minimum, has the functional capability specified by and complies with the other requirements of,
a Version of the CHTS (but only those provisions that are described as applying to ‘Gas Proxy Functions’) which was within its Installation Validity Period on the date on which the device was installed.

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