Direct Fired Water Heaters
Keystone Condensing Water Heaters produce high volume hot water in with high energy efficiency.
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Perfectly sized for large residential and light commercial applications.
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Compact Footprint
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Modulating with 5 to 1 Turndown
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Advanced Cascade Capability
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Building Automation System Interface
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LP Conversion Kit
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PVC, PP, and SS Venting up to 100'
Performance Specifications
| Boiler Model |
Fuel |
Input MBH |
Thermal Efficiency % |
Combustion Efficiency % |
DOE Heating Capacity |
Turndown Ratio |
Net AHRI Rating MBH |
|
KS 399 T
|
Natural Propane
|
80 - 399
|
96.5
|
96.5
|
386
|
5 : 1
|
336
|
|
KS 500 T
|
Natural Propane
|
100 - 500
|
95.0
|
95.0
|
475
|
5 : 1
|
413
|
|
KS 600 T
|
Natural Propane
|
120 - 600
|
95.3
|
96.0
|
572
|
5 : 1
|
497
|
|
KS 750 T
|
Natural Propane
|
150 - 750
|
96.6
|
96.6
|
724
|
5 : 1
|
630
|
|
KS 850 T
|
Natural Propane
|
170 - 850
|
95.7
|
95.7
|
813
|
5 : 1
|
707
|
|
KS 1000 T
|
Natural Propane
|
100 - 1,000
|
94.2
|
94.2
|
942
|
10 : 1
|
819
|
|
KS 1200 T
|
Natural Propane
|
120 - 1,200
|
95.1
|
94.8
|
1120
|
10 : 1
|
974
|
