Answer
When the fridge is turned on it surges, drawing a large amount of ac current and reducing the emf felt by the household circuit. After the motor stabilizes, it doesn't need as much current and the emf and power return to the normal levels.
In contrast, a heater uses somewhat of a continuous surge of current and therefore reducing the total emf felt by the house until it is unplugged and taken away from the circuit.
Work Step by Step
When the fridge is turned on it surges, drawing a large amount of ac current and reducing the emf felt by the household circuit. After the motor stabilizes, it doesn't need as much current and the emf and power return to the normal levels.
In contrast, a heater uses somewhat of a continuous surge of current and therefore reducing the total emf felt by the house until it is unplugged and taken away from the circuit.
