To replace the sacrificial anode on my water heater you need to: 1. Dig the plug bolt out from the spray foam insulation with some tiny picks. 2. Get a breaker

To replace the sacrificial anode on my water heater you need to: 1. Dig the plug bolt out from the spray foam insulation with some tiny picks. 2. Get a breaker bar to get enough torque to unseat the nut. 3. Strap the tank to a wall to avoid it moving when using the breaker bar. The manufacturers don't want you replacing them either. It took over an hour to do something that in theory could take less than 5 minutes. That said, if you have an non-heat pump electric water heater like mine you're probably better of letting it die and replacing it with a heat pump based model.