Features:
316L Stainless Steel Heat Exchanger
Modulating Stainless Steel Burner
Self Diagnostic Microprocessor Controls
Adjustable Thermostat Differential
Sealed Combustion, PVC Vent
High Density Poly Cabinet
Water Flow Switch
Pressure Relief Valve
Dual High Limit Sensors
All Bronze Circulating Pump
24/7 Customer Service

Options:
Condensate Pump
Concentric Vent Kit For Horizontal or Vertical Termination
Condensate Neutralizer Filter Kit
Stacking Stand
Pre-piped Plumbing Manifold

Features:
Equa-Fire™ Control
85% Thermal Efficiency
Hot Surface Ignition
Flow Switch
Operating Contol/High Limit
Stainless Steel Burners
ASME 160# Heat Exchanger
Ceramic Tile Combustion Chamber
ASME Relief Valve
Built-in Reduncance (Models 991 and above)
CDS-1 (Boilers Only)
Field Covertable Air Inlet Box (Models 991 and above)
Combustion Air Filter (Models 991 and above)

Options:
Sealed Air Horizontal Powered Vent Cap
Outdoor Vent Cap
Cupro-nickel Heat Exchanger
Stack-Pack, allows twice the input in the floor space of one unit.