Brochure

Condensing Boilers from 399 to 850 MBH
Condensing Water Heaters from 199 to
500 MBH
High Efficiency with Thermal Efficiencies
up to 97%
Compact Footprint
Modulating with 5 to 1 Turndown
Advanced Cascade Capability
Building Automation System Interface
Features
Meets 2012 SCAQMD NOx Emissions
Requirements
LP Conversion Kit
High Efficiency Gas Boilers and Water Heaters
Triangle Tube’s Keystone Series Condensing
Boilers and Water Heaters are designed for
large residential and light commercial appli-
cations.
The stainless steel heat exchanger and
burner provides high efficiency, low emis-
sions, and high turndown to minimize short
cycling. With maximum inputs of 850 MBH for
boilers and 500 MBH for water heaters, the
Keystone series can meet most needs with a
single unit.
For larger requirements the advanced control
allows units to be joined and function with
parallel modulation for maximum efficiency.
500 - 850 MBH
Boilers are
CSD-1 Compliant
STANDARD