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<p>The variables stated in the answer to Q258961 on 11 June 2019, apply to the in
situ test context for the boiler, not to the heating system. The required test conditions
for the boiler are described in BS 15502-1, sections 8.1.1 and 8.1.2, unless otherwise
specified elsewhere in the standard for specific cases. These conditions include for
example requirements on the preparation of test gases, test pressures, test room ventilation,
ambient temperature, protection from solar radiation, physical mounting conditions,
measurement conditions and tolerances, insulation of the test rig, establishment of
thermal equilibrium, conditional control settings and several other similar items
requiring closely controlled test room conditions.</p>
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