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8
Performance Data
Table 8A SET Backup Recovery Performance
Heat Exchanger
Volume
Gallons
Model
Solar
SET065
2.2
SET080
2.2
SET119
3.2
Table 8B SDT Backup Recovery Performance
Heat Exchanger
Volume
Model
Gallons
Boiler
SDT065
1.9
SDT080
1.9
SDT119
2.6
*
Amount of water drawn from tank with no energy input
How to Properly Size Your Indirect Water Heater
Use the First Hour Rating (FHR) to properly size your Indirect Water Heater. The FHR is the amount of hot water in gallons
the water heater can supply in the first hour of operation (starting with a tank full of hot water). The FHR is dependent on tank
capacity, source of heat, and the size of the burner.
The Indirect Water Heater and Boiler sizing charts can be found on pages 23 and 24. Locate your Indirect Water Heater and
Boiler along with your required First Hour Rating. This will also determine the flow needed between the Indirect Water Heater
and Boiler.
The charts utilize only the upper boiler
NOTICE
coil and the upper half of the tank.
22
Heated
Water
Volume
Gallons
65 ° F Rise
28
35
44
Heated
Water
Volume
Gallons
65 ° F Rise
Solar
2.2
32
2.2
36
3.2
53
SDT/SET Installation & Operation Manual
Recovery
Back Up
Minutes
90 ° F Rise
78
108
89
123
120
166
Recovery
Boiler
Back Up
Output for
Minutes
Recovery
90 ° F Rise
BTU/HR
8
13
9
15
10
17
* First Draw
Gallons
115 ° F
140 ° F
34
44
55
* First Draw
Gallons
115 ° F
128,000
42
128,000
49
217,000
65
26
31
42
140 ° F
30
35
50
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