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

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

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

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