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INNOVATIVE FEATURES FOR ENHANCED COMFORT AND EFFICIENCY
Heat Exchanger –
Constructed of heavy-gauge steel for maximum life.
Innovative Combustion Chamber –
Constructed from alumina-silica ceramic fiber,
provides quiet operation and high efficiency.
Riello Burner –
Delivers super-efficient combustion for greater fuel economy. A
high-quality burner with special attention to sound reduction.
Blower Motor –
Multi-speed, direct-drive system that is statically and
dynamically balanced.
Insulated Blower Compartment –
Minimizes operating sounds.
Durable, Insulated Steel Cabinet –
Built to last and coated with a high-quality paint finish.
O25
Up to
84% AFUE
more energy-efficient
97%
78%
THIS MODEL
81.5%-84%
Elite
®
Series O25 Specifications
O25 Upflow 025Q2-70 Q2/3-105/120 Q4/5-140/154
AFUE 84% 82% 81.5%
Dimensions HxWxD (in.) 54 x 19-1/2 x 30-5/8 54 x 19-1/2 x 30-5/8 54 x 22-1/2 x 33-1/8
HxWxD (mm) 1372 x 495 x 778 1372 x 495 x 778 1372 x 572 x 841
OF25 Lo-Boy (Rear Flue) Q2/3-105/120R
OF25 Lo-Boy (Front Flue) Q2/3-105/120
AFUE 82% front/82.5% rear
Dimensions HxWxD (in.) 37 x 19-1/2 x 52-1/8
HxWxD (mm) 940 x 495 x 1324
OHR25 Down-flow/Horizontal Q2/3-105/120
AFUE 83.5%
Dimensions HxWxD (in.) 59 x 23-1/2 x 23-1/2
HxWxD (mm) 1499 x 597 x 597
Note: Due to Lennox’ ongoing commitment to quality, all specifications, ratings and dimensions are subject to change without notice.
Quality you can trust.
Designed with reliable, time-tested components.
Lennox is proud of the
fact that these products
have earned the Good
Housekeeping Seal.