Just bought 2 of these Ehein heaters for my 90 gallon tank.I know it's overkill,but the room tank is in gets very cold with this New York weather.I keep them in a vertical position on either side of the tank(they are very long).I have read that when you do water changes these heaters will be just fine even when they are sticking out of the water.I hope the are because I just did a water change and a good portion of these heaters were sticking out of the water.Anyone know this to be true?They seem to be working just fine still.