The number one reason fountain pumps fail is lack of water. These pumps are magnetic drive pumps and are water cooled. If the pump is not fully under water when running at all times, it will burn out in just a few hours. Many customer have found that their pumps are placed just under the level of the water and that over the matter of days or a week the water level will drop from evaporation and will start sucking in a little air with the water...