What size fuse for a 1500 watt block heater?
For a 1500 watt block heater, you would typically use a 15 amp fuse. This is calculated by dividing the watts (1500) by the voltage (120 in most cases) to get the amperage. In this case, 1500 watts / 120 volts = 12.5 amps, so a 15 amp fuse would be the appropriate size to accommodate any potential spikes in power usage.