Steam Boilers, Engines, Nozzles and Turbines
Boiler H.P. is defined as the

Work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam
Work done by 1 kg of steam at saturation condition
Steam evaporation rate per kg of fuel fired
The evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam

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Steam Boilers, Engines, Nozzles and Turbines
In recuperative air preheaters, the heat is transferred

From a metal wall from one medium to another
Heat is transferred by bleeding some gases from furnace
From heating an intermediate material and then heating the air from this material
By direct mixing

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