Brochure

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Hydronic Heating Boilers
The A. O. Smith high efficiency condensing XP Boiler utilizes
a state-of-the-art heat exchanger and control technology to
meet the rigorous demands of today’s hydronic heating
applications. The XP Boiler’s all stainless steel water tube
heat exchanger construction allows the XP Boiler to operate
in a continuous condensing mode while maximizing
longevity and delivering exceptional energy-saving
performance. Low temperature applications such as heat
pump and snow melting systems can see thermal efficiencies
as high as 99%, a major savings over non-condensing
competitive systems.
A unique multi-burner design is control sequenced and
modulated to produce turndown rates of up to 20:1.
Precise temperature control and accurate load matching
results in smooth system operation and eliminates
wasteful short cycling and temperature overshooting.
Advanced Multi-Burner, Low NOx
Combustion Technology
 Venturi-mixing gas/air ratio system - works with variable
speed blower to precisely mix gas and air throughout
firing range
 Fully modulating capability prevents energy-stealing short
cycling and provides smooth system operation with higher
overall system efficiencies
Low NOx Operation
 Complies with SCAQMD Rule 1146.2 for XB1000 through
XB2000 and Rule 1146.1 for XB2600 and XB3400, and other
air quality management districts with similar requirements
for low NOx emissions
Advanced Sola Control
 Large touch screen user interface
 Direct MODBUS protocol connections
 The latest in energy saving algorithms
 Outdoor reset is standard and includes remote outdoor
temperature sensor - modulates the boiler to maintain
desired system temperature within +/-1 degree
 Boiler output control features 20:1 turndown ratio on
models 2 million btuh and up, 10:1 turndown ratio on
models 1.7 million btuh and down
Factory-Mounted Secondary Pump(s) (optional)
 Recommended for primary/secondary piping systems
 Integrally mounted, wired, and controlled by the
boiler control
 Factory-sized for proper flow through the boiler
 Allow up to 50 equivalent feet of piping between the
boiler and the primary heating system
Multi-Pass/Multi-Burner Condensing Stainless
Steel Heat Exchanger
 Utilizes leading-edge multi-pass water tube heat exchanger
to maximize heat transfer
 Designed for fully condensing operation throughout the
heating range
 All heating surfaces are 316L stainless steel to provide a
long and trouble-free service life
 Saves fuel and operating cost with every heating cycle
 Impervious to thermal shock
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