The Toyotomi 20476778 is a genuine 7 Amp Fuse for OM-180. 7 amp fuse that protects the OM-180 control circuit. A blown fuse is the first thing to check on a dead unit.
This is an OEM Toyotomi part, so it fits and performs the way the original did. Confirm your heater model before ordering; the model is on the rating label on the unit. If you are not sure which part you need, Rural Energy support can check it against your model and serial number.
Rural Energy is a Toyotomi distributor and keeps Oil Miser water heater parts in stock for fast shipping to dealers and homeowners.