comparisons
This is the second of three articles on using auto-fill devices with ponds and watergardens. Auto-fill devices for use in managing water levels in ponds and watergardens come in three main forms: mechanical float valves, electromechanical timed valves and electronic sensing systems. In this article, we’ll take a look at each system and weigh advantages and disadvantages. Let’s tackle price first: Of the three
Places just below the earth’s surface have been a resource for heating and cooling basically since the planet took shape. Ever since, all sorts of creatures have taken refuge from excessive heat or extreme cold by burrowing into the soil, and it’s no accident that some of the earliest examples of human self-expression have been found in caves deep below the surface. With pools and spas, however, up until recently there’s always been a legitimate question about whether this timeless heating/cooling approach was workable on any sort of cost-effective basis. If recent projects designed by my firm, Aloha Pools Design Studio (Franklin, Tenn.) are any indication, that question has now been answered with a resounding yes. On the face of it, that answer seems obvious. After all, the U.S. Department of Energy says that geothermal heating is more cost effective than a 95-percent efficient gas heater – and that the same would be true even if 100-percent efficient gas heaters were available. Only recently, however, have the suppliers of these systems reached a point where their equipment is
