System information

Carrier Geothermal Heat Pump Systems

Residential Products Technical Guide

Water-to-Water Heat Pumps

Water-to-water heat pumps give the customer “the best of both

worlds,” geothermal heating and cooling, plus the ability to enjoy

the beneﬁ ts of warm radiant ﬂ oors. The Carrier Geothermal GT-

PW (50YER) series water-to-water heat pumps provide hot and/

or chilled water. In most applications, the water-to-water unit is

connected to a buffer tank, where hot or chilled water is stored,

and the hydronic system components (radiant ﬂ oor or fan coil

units) pull hot or chilled water from the tank. This “decouples” the

unit water ﬂ ow rate from the hydronic system ﬂ ow rates, giving

the designer the ﬂ exibility of using as many heating/cooling zones as

desired. Radiant ﬂ oor heating is known for its unequaled comfort

and energy savings; when coupled with geothermal technology, the

system is the ultimate in heating.

The GT-PW (50YEW) Series is unlike any other water-to-water

heat pump on the market today. The 50YEW can deliver up to

145°F (63°C) leaving load water temperature even at 32°F (0°C)

entering source temperature. The GT-PW includes a built-in

controller to control the unit and circulating pumps. It even

has an outdoor reset function to vary the buffer tank set point

depending on the outdoor temperature to heat only as much

as needed. The GT-PW also has an optional DHW mode for

heating potable water.

In summary, with Carrier Geothermal’s broad equipment line,

almost any installation can include a geothermal heat pump.

Forced air heating and cooling, radiant ﬂ oor heating, chilled water

cooling, and combinations of various systems provide customers

with systems customized to their speciﬁ c needs. High value, high

quality and environmentally responsible products separate Carrier

geothermal heat pumps from other heating and cooling systems.

GT-PW Series Geothermal Heat Pumps

The Geothermal Heat Pump