What type of hose should be used when flushing a water heater?
If you're going to flush the hot water heater you might as well turn it off and then take a shower or do a load of laundry. That way the water will only be lukewarm when you flush the tank and you won't throw away water you already paid to heat. Then you don't need to worry about the type of hose (or worry about spilling scalding water on yourself).