Q90-200 Series Condensing Boiler ,   Model: Q90-200 Additional Information The Q90-200 offers a remarkable 90% AFUE efficiency rating, dramatically reducing fuel consumption and paying for itself in substantial fuel savings. The Q90-200 utilizes a cast aluminum heat exchanger, offering greater thermal conductivity which transfers heat three times faster than conventional cast iron and produces enormous gains in heat-up speed and operating efficiency. The units feature integrated boiler control with high limit for operation, safety and diagnostics. Ignition is provided by a hot surface igniter and single stage gas valve. Air flow proving switches ensure air intake and exhaust vents are clear. All components are easily accessible for ease of installation and maintenance. Unlike conventional atmospheric boilers, the Q90-200 has sealed combustion, direct-vent forced draft design to draw fresh air from outdoors for combustion, instead of from inside the home. Cooled flue gas can be safely vented through inexpensive, readily available and easy to install PVC, after 5'' of CPVC provided with the unit. The air intake also utilizes PVC pipe. Efficiency: Energy Star Rated Capacity: 125 - 150 - 175 - 200 MBH Heat Exchanger: Cast Aluminum Combustion: Sealed Combustion Venting: Direct Vent Boiler Type: Hot Water Brochure 240006157 - Q90-200 High Efficiency Homeowner Info 213 kb 240005047 - Q90-200 Rev. 10/08 624 kb Installation & Operation Manual 240006888 - Q90-200 Dielectric & Antifreeze Addendum Rev. D 349.2 kb 240004826D - Q90-200 Rev. A 2.5 MB Other 240004751 - Q90-200 Igniter Kit Instructions Rev. 1.0 357.6 kb Parts Lists 240005123 - Q90-200 Rev. D 982.8 kb Product Bulletin Q90-200 Antifreeze & Dielectric Rev. 6/09 63.3 kb Q90-200 Igniter Change Bulletin 6/19/09 49.6 kb Service & Technical Guide Dunkirk Radiation Tables 96.2 kb Service Bulletin Q90-200 Burner Change Rev. 2/06 314.3 kb Specification Sheet 240005688 - Q90-200 Rev. 1.0 563 kb Tax Certification Statement 240007907 - Q90-200 Manufacturers Tax Certification Statement Rev. C 47.4 kb User Manual 1305032 - Q90-200 Rev. 1.0 30.1 kb Warranty 1595022 - Q90-200 Rev. A 34.8 kb