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Federal Register / Vol. 86, No. 223 / Tuesday, November 23, 2021 / Rules and Regulations determination was published and that products on the market today are approximately the same as those available in 2016. AHAM, No. 19 at p. 2; AHRI, No. 18 at p. 2 DOE has also found that the products available on the market today are approximately the same as those available in 2016, as discussed in section III.B.3.d, and that the market for DHE is declining, as discussed in section III.B.3.g. of this document.
Manufacturers In the December 2020 NOPD, DOE
noted that the number of manufacturers producing vented heaters increased in the CCMS database from four to five between the October 2016 final determination and the December 2020
NOPD. 85 FR 77017, 7702877029 Dec.
1, 2020. This new manufacturer mainly produces hearth products which are not subject to this final determination but also manufactures two gas wall gravity type vented heaters with input rate and AFUE values that are comparable to the input rate and AFUE
values of other models available on the market, and that are similar in design.
Since the publication of the December 2020 NOPD, one manufacturer acquired another manufacturers vented heater brand, resulting in four manufacturers producing vented heaters.18
b. Technology Options for Efficiency Improvement In the February 2019 RFI and December 2020 NOPD, DOE listed the technology options considered in the previous rulemakings to increase AFUE
and requested comment on these options and any other technology options that would be relevant to vented heaters. 84 FR 6095, 6099 Feb. 26, 2019; 85 FR 77017, 77029 Dec. 1, 2020. Specifically, DOE identified the technologies in the following Table III.4
for improving the efficiency of vented heaters.

TABLE III.4TECHNOLOGY OPTIONS
FOR VENTED HEATERS
Technology options Increased heat exchanger surface area.
Multiple flues.
Multiple turns in flue.
Direct vent concentric.
Increased heat transfer coefficient.
Electronic ignition.
Thermal vent damper.
Electrical vent damper.
Power burner.
Induced draft.
Two-stage and modulating operation.
Improved fan or blower motor efficiency.
Increased insulation.
Condensing.
Condensing Pulse Combustion.
Air circulation fan.
Sealed combustion.

As stated in the December 2020
NOPD, DOE found that the available range of input rates and AFUE values of vented heater products available on the market have stayed largely the same since the October 2016 final determination. 85 FR 77017, 77029
Dec. 1, 2020. DOE further stated that differences in the available input rate and AFUE were mostly due to models being taken off the market as opposed to new models being added and that this indicates that the technology options currently available are similar to those examined in both the April 2010 final rule and October 2016 final determination. Id. DOE did not identify any additional technologies, and there were not any comments suggesting additional technology options for vented heaters that were not previously considered. Therefore, DOE used the technology options in Table III.4 of this document for its review of potential amended vented heater energy conservation standard levels in this document.
c. Screening Analysis In the February 2019 RFI, DOE
identified and explained why four of the technologies on its initial list had been previously screened out: 1 Increased heat transfer coefficient practicability
66413

to manufacture, install, and service; 2
power burner practicability to manufacture, install, and service; 3
condensing pulse combustion technological feasibility; and 4
improved fan or blower motor efficiency practicability to manufacture, install, and service. 84 FR 6095, 60996100
Feb. 26, 2019. DOE also noted that it only considers potential efficiency levels achieved through the use of proprietary designs in the engineering analysis if they are not part of a unique pathway to achieve the efficiency level i.e., if there are other non-proprietary technologies capable of achieving the same efficiency level. 84 FR 6095, 6099
Feb. 26, 2019. In the December 2020
NOPD, DOE maintained the tentative screening approach presented in the February 2019 RFI. 85 FR 77017, 77029
Dec. 1, 2020. DOE did not receive comments on the screening analysis in response to the December 2020 NOPD.
In evaluating potential technology options for this final determination, DOE maintained the list from the February 2019 RFI and December 2020
NOPD, as discussed in section III.B.3.b.
of this document. In addition, DOE did not find that any of the technology options should be screened out from consideration as options for improving the AFUE of vented heaters other than the four previously screened-out.
d. Engineering Analysis For the April 2010 final rule, DOE
determined technology options by efficiency level for each of the vented heater product classes. These technology options are found in section 5.7 of the April 2010 final rule TSD 19
and are reproduced in Table III.5 of this document. The representative input rate ranges from the April 2010 final rule are: >42,000 Btu/h for gas wall fan type vented heaters, >27,000 Btu/h and 46,000 Btu/h for gas wall gravity type vented heaters, >37,000 Btu/h for gas floor vented heaters, and >27,000 Btu/
h and 46,000 Btu/h for gas room vented heaters. 75 FR 20112, 20114
April 16, 2010.

TABLE III.5APRIL 2010 FINAL RULE TECHNOLOGY OPTIONS BY EFFICIENCY LEVEL FOR THE REPRESENTATIVE INPUT
RATE RANGES OF THE VENTED HEATER PRODUCT CLASSES

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18 HVAC Insider, Williams Acquires Cozy Heating Systems, 2021. www.hvacinsider.com/williams-

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Intermittent Ignition and Two-Speed Blower.
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