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Applications Manual
4.5 Bosch Water-to-Air Geothermal
Heat Pump Ratings
One of the most confusing aspects of water-to-air
geothermal heat pump technology is equipment ratings.
These heating and cooling performance values are useful
for comparing units of the same type (i.e., air-source heat
pump to air-source heat pump or geothermal heat pump
to geothermal heat pump). Unfortunately, the ratings used
for different types of equipment (furnaces, air-source
heat pumps, geothermal heat pumps) are not generally
consistent making comparisons dif cult. As a result, it is
useful to know what the ratings values include and what
they don't.
For many years, ratings obtained for water-source heat
pumps were tested using two speci c sets of criteria:
the three standards developed by the Air Conditioning,
Heating and Refrigeration Institute (AHRI), AHRI
Standards 320, 325, and 330 (1998), and the single
standard developed by the International Organization
for Standardization (ISO), ISO Standard 13256-1 (1998)
(Table 1).
Water-to-Air Geothermal Heat Pump Ratings
Entering Air - DB/WB ÝF
Cooling
Entering Water - ÝF
Fluid Flow Rate
Entering Air - DB/WB ÝF
Heating
Entering Water - ÝF
Fluid Flow Rate
Tab. 1
* Flow rate is set by 10ÝF rise in standard cooling test
** Flow rate is speci ed by the manufacturer
Note: Part load conditions not shown.
WLHP = Water Loop Heat Pump
GWHP = Ground Water Heat Pump
GLHP = Ground Loop Heat Pump
Bosch Thermotechnology Corp.
ISO/AHRI
ARI 320
13256-1
WLHP
80/67
80.6/66.2
85
86
*
**
70
68
70
68
*
**
Bosch Geothermal Heat Pumps | 15
ISO/AHRI
ARI 325
13256-1
GWHP
80/67
80.6/66.2
50/70
59
**
**
70
68
50/70
50
**
**
ISO/AHRI
ARI 330
13256-1
GLHP
80/67
80.6/66.2
77
77
**
**
70
68
32
32
**
**
Data subject to change
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