Gas rate
The volume of gas an appliance burns per hour, measured at the meter, usually in m³/h. It is used to work out the appliance’s heat input.
With a metric meter, take two readings a known number of seconds apart: (second − first) × 3600 ÷ seconds gives m³/h. With an imperial meter, time one revolution of the test dial: dial size × 3600 ÷ seconds gives ft³/h, and × 0.0283 converts to m³/h.
Only the appliance being tested should be running, at full rate. The result is compared with the data plate or the manufacturer’s figures.
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A plain-language explanation, not a technical procedure or legal advice. Follow the current regulations, industry procedures and manufacturer’s instructions.