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State whether the following is true or false.
A condensing boiler can exceed one hundred per cent efficiency when the efficiency is quoted on the net calorific value.

  • A.True only at large scales
  • B.False only at small scales
  • C.True
  • D.False

Answer: C

Recovering the latent heat that the net value excludes makes the ratio exceed one, which is an artefact of the definition rather than a violation of anything. Quoted on the gross value the figure stays below one hundred per cent.

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