This works really well. It's great not to have to burn propane when I'm plugged in at a campground or using the motorhome for guests at my house. A couple of things to keep in mind if you install one: The thermostat block that you stick to the side of your tank that allows this to regulate heat, has a built-in safety shut-off if it detects the tank getting hotter than it's supposed to. That's great, but if you are not plugged in, and you heat your tank with propane, and that makes the water get hotter than your Hybrid Heat setting, it will pop that safety, and the next time you try to heat using electric, it won't work. You will have to push the safety button back in (on the top of the thermostat block). Also, when I installed mine, I drilled a hole to feed the wires inside, then I used silicone to seal the hole. I didn't think about leaving enough slack in the wires to make sure I could unscrew and remove the probe when/if I wanted to ever drain the tank (for winterizeing, etc.). Fortunately, as it turns out, I left JUST enough to barely get the probe out without having to cut away all that silicone and release the wires. Make sure you think of that ahead of time and make sure whatever you do to secure the wiring or seal it up leaves enough slack to remove the device when necessary.
Rating: [4 of 5 Stars!]