So many of the aquarium heaters I’ve bought for my fish and turtle tanks have been junk and wear out very quickly leaving the heater constantly on. This is both frustrating and dangerous. I use Rena filters on my tanks and find that this company produces the best aquarium products on the market in my opinion. That being said, the shipper sent the two heaters I ordered and one of them didn’t work from the start. I am too lazy to send it back. The other one went in my turtle tank and has been working great. Water enters the bottom and exits the top heated — my guy loves to lay on the output for the warmth!

Since I have a Rena canister filter system, and I needed a good quality heater , this was a no brainer. Replaces a heater with the simple Hi/Low knob for temp control, and could never keep stable temps. This has real thermostat knob, and of course attaching to the filter tube makes much less clutter in the tank. Have had for a few days now, and temp is very stable.