An 2.27-m³ steam boiler initially contains 1.7025m³  of liquid water and 0.5675m³ of water vapor in equilibrium at 100 kPa. The boiler is fired up and the liquid and vapor in the boiler are heated. Somehow the valves on the inlet and discharge of the boiler are both left closed. The relief valve lifts when the pressure reaches 4.0 MPa. Determine the heat transfer (kJ) to the boiler before the relief valve lifts.