My family used to have a gas fan heater. But its cord was bitten by the hamster and the fan heater was broken. We bought a new gas fan heater for 24,000 yen ($200.00 €163.27) at a department store.
Images below are the cord bitten by the hamster. Tokyo Gas told me it probably takes 10,000 yen for repair. So my wife and I decided to buy a new heater.