does anyone place their heaters horizontally on your sump or tank bottom?? i have 3 Jargars 300 watt heaters place on the bottom of the sump.. i only brought these heaters in june of 2013 and it's only used it 1 winter.. i had to replace 2 of them already and i know most of people here VOUCH for these heaters all the time.. so anyone have this problem and how to correct it?