Heat input (gross and net)
The rate at which an appliance takes in energy from its fuel, in kW. Gross includes the heat in the water vapour in the flue gases; net leaves it out.
Heat input in kW gross is gas rate in m³/h × calorific value in MJ/m³ ÷ 3.6. For natural gas, net is gross ÷ 1.11.
Data plates may show gross, net or both, so check which one before comparing with what you measured.
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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.