Signature

Merit

Merit

FEATURE

G71P

G43

G40

Energy Efficiency

95% AFUE

Up to 92.1%

80%

Meets Energy Star requirements

Y

Y

_

Quiet Operation

Silent ComfortTechnology

Insulated

Insulated

Variable Speed Motor

Y

_

_

Stages of Heating

Variable-capacity operation

1

1

Enhanced Humidity Control

Y

_

_

Ultralow Constant Fan

Y

_

_

Insulated Blower Compartment

Y

_

_

Air Filter and Humidifier Compatible

Y

Y

Y

Ignition

SureLight

Hot Surface Igniter

Hot Surface Igniter

Parts and Control Warranty

10 year limited warranty on parts and controls

5 year limited warranty on covered components

5 year limited warranty on covered components

Heat Exchanger Warranty

Limited lifetime warranty

20 year limited warranty

20 year limited warranty