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Federal Register / Vol. 86, No. 223 / Tuesday, November 23, 2021 / Rules and Regulations
TABLE III.5APRIL 2010 FINAL RULE TECHNOLOGY OPTIONS BY EFFICIENCY LEVEL FOR THE REPRESENTATIVE INPUT
RATE RANGES OF THE VENTED HEATER PRODUCT CLASSESContinued DHE type
Heat circulation type
Efficiency level AFUE
77
80
64
66
68
69
70
57
58
64
65
66
67
68
83

Gravity Type
Gas Floor

All
Gas Room

All
Technology Intermittent Ignition, Two-Speed Blower, and Improved Heat Exchanger.
Induced Draft and Electronic Ignition.
Standing Pilot.
Standing Pilot and Improved Heat Exchanger.
Standing Pilot and Improved Heat Exchanger.
Standing Pilot and Improved Heat Exchanger.
Electronic Ignition.
Standing Pilot.
Standing Pilot and Improved Heat Exchanger.
Standing Pilot.
Standing Pilot and Improved Heat Exchanger.
Standing Pilot and Improved Heat Exchanger.
Standing Pilot and Improved Heat Exchanger.
Standing Pilot and Improved Heat Exchanger.
Electronic Ignition and Multiple Heat Exchanger Design.

No longer available on the market.
Efficiency level adopted in as the Federal standard the April 2010 final rule at the representative input rate.
This was a theoretical model and was not on the market at the time of the April 2010 final rule analysis.

DOE reviewed the technology options available in the current vented heater market for the representative input rate
ranges from the April 2010 final rule.
The available efficiency levels and
associated technologies are shown in Table III.6 of this document.

TABLE III.6CURRENT TECHNOLOGY OPTIONS BY EFFICIENCY LEVEL OF THE REPRESENTATIVE INPUT RATE RANGES OF
THE VENTED HEATER PRODUCT CLASSES FROM THE APRIL 2010 FINAL RULE
DHE type Gas Wall

Heat circulation type
Efficiency level AFUE

Fan Type
76
77
80
90
66
68
69
70
58
67
68
83

Gravity Type
Gas Floor
Gas Room

Technology
All All
Intermittent Ignition and Improved Heat Exchanger.
Intermittent Ignition, Two-Speed Blower, and Improved Heat Exchanger.
Induced Draft and Electronic Ignition Electronic Ignition and Condensing.
Standing Pilot and Improved Heat Exchanger.
Standing Pilot and Improved Heat Exchanger.
Standing Pilot and Improved Heat Exchanger.
Electronic Ignition.
Standing Pilot and Improved Heat Exchanger.
Standing Pilot and Improved Heat Exchanger.
Standing Pilot and Improved Heat Exchanger.
Electronic Ignition and Multiple Heat Exchanger Design.

Condensing gas wall fan type vented heaters exist in an input rate range that was not the representative input rate range in the April 2010
final rule. Thus, the max-tech level presented is theoretical for the representative input range, but exists in models on the market in other input ranges.
This is a theoretical efficiency level based on the analysis for the April 2010 final rule, and is not available in any model currently on the market.

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The maximum available efficiency level is the highest efficiency model currently available on the market for that class. The max-tech efficiency level represents the theoretical maximum possible efficiency if all available design options are incorporated in a model. In some cases, models at the max-tech
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efficiency level are not commercially available because, although the level is technically achievable, manufacturers have determined that it is not economically feasible either for the manufacturer to produce or for consumers to purchase. However, DOE
seeks to determine the max-tech level
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for purposes of its analyses. The current maximum available efficiencies for the 11 existing product classes are included in Table III.7, along with the maximum available efficiencies from the April 2010 final rule and those evaluated for the October 2016 final determination.

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