Stupid question... whats the tank on top of my water heater ??
Here's a stupid question. We moved in a year ago and I still haven't been able to figure out what the tank is on top of the water heater. I was guessing it's a water softener or??? If so how do I use it there is one blue turning knob on top but I don't know what it does so I haven't touched it. Any replies would be greatly appreciated. Thanks!