Bests & Worsts Reviews from Amazon

It finally got cold enough to try this out. So far, it seems to work very well. Temperatures have been in the 20s and 30s and it keeps a 12" circle of water ice-free. The birds have definitely been taking advantage of it. It mentions this in the description, but I missed it initially, so I just thought I would reiterate that this heater is thermostatically controlled, so it only turns on when necessary. That's nice, as thermostatic plugs cost twenty bucks or more. [UPDATE] My circuit breaker tripped and the birdbath water froze. When I turned it back on, the heater thawed its way out of a solid block of ice at 5 degrees F. I'd say that it works pretty well!