HWM-407CH-IOM (09/13)
Page 14
D. Storage Water Heater Sizing and Connections
Storage water heaters are necessary with EarthLinked
®
radiant panel hydronic heating and
chilled water cooling systems, as illustrated in Figures 3, 5 and 6.
ETI Models 60, 80 or 119 GSTE storage water heaters are configured specifically for
hydronic heating and chilled water cooling and meet all requirements for these applications.
Recommended water storage heater capacities are shown in Figure 8b, based on the
nominal tonnage of the compressor
unit specified. Typical water heater plumbing
connections are illustrated in Figure 8c.
Compressor
Unit
Model/Capacity, BTUH
HWM Model
ETI Storage
Water Heater Size,
US Gallons
ETI Storage
Water Heater
Element Rating, kW
Minimum Nominal
Type L Hard Copper
Pipe & Fittings, inches
-018/18,000
-18B
60*
4.5
3/4
-024/24,000
-24B
60*
4.5
3/4
-030/30,000
-30B
60*
4.5
1
-036/36,000
-36B
60*
4.5
1
-042/42,000
-42B
80
4.5
1-1/2
-048/48,000
-48B
80
4.5
1-1/2
-060/60,000
-60B
80
4.5
1-1/2
-072/72,000
-72B
80
4.5
1-1/2
* NOTE: These sizes are valid only for hydronic heating. If chilled water cooling is to
be provided, 80 gallon ETI Model 80 GST storage water tank is required
.
Figure 8b. Storage Tank Capacities and Pipe Sizes
