Boiler/Tower Systems ARI 320

In some applications, WaterFurnace liquid source heat pumps are used in conjunction with conventional boilers and ooling towers or condensers.
Existing boiler/tower jobs are frequently retrofitted for efficiency upgrades; where large geothermal systems are not viable. Hybrid systems incorporate geothermal loops coupled with down-sized conventional heat rejection or addition equipment (tower or boiler). In a hybrid system the boiler or tower are added to a down-sized geothermal loop to handle the peak loads over a short period of the season.

Ground Water ARI 325

Open loop systems use the natural thermal stability of a plentiful supply of ground water. Less excavation is required with open loop systems, reducing initial installation costs. Ground water can be returned to the water table with no harmful environmental effect. Open loop systems use a well to supply entering water, and discharge is piped into a return well or into a suitable surface drainage area.
Open loop ground water systems offer the advantages of high efficiency and low cost where conditions permit.

Closed Loop Earth Coupled ARI 330

The earth itself is a vast reservoir of low temperature thermal
energy that is renewed every day by radiant energy from the sun. WaterFurnace systems use the earth as a natural heat source of sink for heating and cooling.
Earth coupled systems can be either horizontal or vertical, depending on available space and soil conditions. Horizontal ground loops are a series or parallel polyethylene pipes laid in trenches four to six feet below the surface and backfilled. Vertical loops are installed in bore holes 150 to 500 feet deep which are then grouted and sealed. When installed properly, ground loops are virtually indestructible.

Pond Loop Systems ARI 330

Water is an excellent thermal medium, and when a pond or
lake is near the building, it can be used as a free source of
energy. In pond loop systems, coils of pipe are anchored to the bottom, enabling the system to extract heat from or reject it into the water as needed. Pond loops are an excellent and inexpensive choice in cases where a drainage pond is required or built for aesthetic reasons. In fact, WaterFurnace’s 115,000 squarefoot corporate headquarters and manufacturing facility in northern Indiana is entirely space conditioned by a 200 ton pond loop system.