We have 47 head of horses and run 14 tanks all 100 gallon. This is the only heater we use! The rest no matter the price are junk!. Note: all brands of heaters after time can shock or rust or stop working...between horses pawling them and being trampled ect dontvexpect any heater to last for life , if you do you are not for the horse business . we have had most of our heaters going on 8 yrs. 1 did finally rust out and one did stop working but considering how many we use and the fact the abuse they go through I am very very happy. You can take a frozen 100 gallon tank throw it on top and watch it heat a hole up . it does wonders. Won't melt even the cheapest plastic blue containers( for parties for ice and drinks ect) that you buy for $4. If it runs dry it shuts off no melting... Can any others say that! Lays in bottom out of way heats till there is no water , does not need to be samurged to work. Heck we hadfrozen pipes no water and dumped snow on this heater and it melted it and have us a trough of water, yeah that's a heater..I'm sure any heater can go wrong but I have used them all and found this one really really is so far greater then the rest!!!!!!!

I used one of these for three years. Worked great--no ice--until yesterday; my horses got a shock when they tried to drink from the trough. Pulled the unit out and found rusty-looking stains around the seam of the plastic housing where the cord attaches. The animals didn't take to it kindly. Looking for a different type to replace this one.