High Heat Value. The high or gross heat content of the fuel with the heat of vaporization included; the water vapor is assumed to be in a liquid state.
Higher Heating Value. The maximum heating value of a fuel sample, which includes the calorific value of the fuel (bone dry) and the latent heat of vaporization of the water in the fuel. (See moisture content and net (lower) heating value, below.)
Higher Heating Value. The theoretical heat of combustion of a fuel, when the water formed is considered as a liquid (credit taken for its heat of condensation). It is also called gross heating value.