A fuel oil is burned with air in a boiler furnace. The combustion produces 813 kW of thermal energy, of which 65% is transferred as heat to boiler tubes that passes through the furnace. The combustion products pass from the furnace to a stack at 550oC. Water enters the boiler tubes as a liquid at 20oC and leaves the tubes as saturated steam at 20 bar absolute.  Calculate the rate (kg/s) at which steam is produced. Use the steam tables to estimate the volumetric flow rate (m3/h) of the steam produced.