Direct Fired Water Heaters

Keystone Water Heater

Keystone Water Heater

Keystone Water Heater Icon
Keystone Condensing Water Heaters produce high volume hot water in with high energy efficiency.
  • Perfectly sized for large residential and light commercial applications.
  • Compact Footprint
  • Modulating with 5 to 1 Turndown
  • Advanced Cascade Capability
  • Building Automation System Interface
  • LP Conversion Kit
  • 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