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Federal Register / Vol. 86, No. 223 / Tuesday, November 23, 2021 / Rules and Regulations
Z21.11.1, Gas-Fired Room Heaters V:
Vented Room Heaters, to incorporate an oxygen depletion safety ODS
system that also acts as a burner ignition system and stated that because of this requirement in the safety standard, prohibition of standing pilot lights would essentially prohibit manufacturing unvented gas heaters.
Joint Gas Utilities, No. 15 at p. 4 DOE
found that CSA/ANSI Z21.11.22019
ANSI Z21.1.22019, Gas-Fired Room Heaters, Volume II, Unvented Room Heaters covers unvented gas heaters and that while section 4.9 of ANSI
Z21.11.22019 does specify that an ODS
system be equipped at the point of manufacture, it does not require that a standing pilot light be used in the ODS
system. Further, DOE has found that unvented heaters exist on the market 15
with ODS systems and without standing pilot lights.
AHAM supported DOEs assessment from the December 2020 NOPD which stipulated that for unvented heaters any heat losses are lost to the living space and, therefore, unvented heaters are nearly 100 percent efficient. AHAM, No. 19 at p. 2 Flux Tailor urged DOE
to reconsider its blanket assumption that all unvented heaters are 100
percent efficient, suggesting that, depending on type of convection technology and other factors, the heaters real capacity to heat a given
space may vary significantly and ultimately effect overall energy consumption. Flux Tailor, No. 21 at p. 21
Section 3.1 of Appendix G contains a calculation for annual energy consumption for primary electric heaters. This calculation uses the national average heating load hours i.e., 2,080 hours. Appendix G does not provide for calculating the annual energy consumption of supplementary electric heaters or unvented gas or oil heaters. To account for potential variation in a units real heating capacity, as suggested by Flux Tailor, an annual energy consumption calculation would need to be developed for all unvented heaters that addressed the heating load hours based on quantity of heat a unit provides to a given space. As this would necessitate amendment to the test procedure, Flux Tailors comment is more appropriately addressed in the ongoing test procedure rulemaking.16
As stated in section III.A.3., this final determination does not consider unvented hearth heaters. To the extent DOE will consider energy conservation standards for unvented hearth heaters it would do so in a separate rulemaking.
3. Vented Heaters a. Market Assessment Models on the Market
DOE has conducted a review of the vented heater market, including product literature and product listings in the CCMS database and AHRI product directory. DOE has concluded that the number of models offered in each of the vented heater product classes has continued to decrease overall since the October 2016 final determination, as shown in Table III.3 of this document.
The model counts presented in Table III.3 of this document are counts of individual model numbers, as opposed to basic model numbers. A basic model can have multiple individual model numbers certified under it. The model counts from previous rulemakings were individual model numbers, so for consistency of comparison, the model counts for 2021 that are presented in Table III.3 of this document are also in terms of individual model number. DOE
acknowledges that, although changes in model counts and shipments sometimes correlate, changes to available model counts do not necessarily indicate a change in the number of units sold. For example, a model could be taken off of the market, but more units of another model could be sold, thereby resulting in roughly the same amount of sales as before the first model was taken off the market. Shipments of vented heaters are discussed is section III.B.3.g of this document.

TABLE III.3VENTED HEATER INDIVIDUAL MODEL COUNTS BY PRODUCT CLASS FOR CURRENT AND PREVIOUS
RULEMAKINGS
Model count by product class Product class
October 2016 final determination

2021
Gas Gas Gas Gas
Wall Fan Type
Wall Gravity Type
Floor
Room

51
57
10
19

64
56
15
28

April 2010 final rule
82
52
15
29

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CCMS database last accessed on July 8, 2021, with further information taken from the AHRI Directory last accessed on July 8, 2021.
Models designated as Production Stopped within the AHRI Directory are not included in the model count.
CCMS database last accessed on July 16, 2015, with further information taken from the AHRI Directory last accessed on July 16, 2015.
Models designated as Discontinued within the AHRI Directory are not included in the model count.
Gas Appliance Manufacturers Association GAMA Directory for Direct Heating Equipment 17 downloaded March 2, 2009. Models designated as Discontinued within the GAMA Directory are not included in the model count.

In response to the February 2019 RFI, AHRI confirmed that there are fewer models in the AHRI Directory now than there were at the time of the October 2016 final determination. AHRI, No. 6
at p. 4

In response to the December 2020
NOPD, the Joint Gas Utilities supported DOEs tentative conclusion that new DHE product lines are generally not being developed, the market for DHE is declining, and most product lines
function mainly to replace existing units. Joint Gas Utilities, No. 15 at p. 3
AHAM and AHRI stated that DHE
products have not seen significant technological advancement since 2016
i.e., when the October 2016 final
15 Specification sheet for an unvented gas heater with electronic ignition and a ODS system:
www.media.rinnai.us/salsify_asset/s-515b633c2926-43a2-98ff-7ac8fbc7c1ab/FC510%20RCE391A-H%20SP.pdf?_
ga=2.116400966.1386589753.162577339236239730.1625773392.

16 DOE published an NOPR regarding test procedures for DHE. 86 FR 20053 April 16, 2021.
The docket for the test procedure NOPR is available at: www.regulations.gov/docket?D=EERE-2019-BTTP-0003.
17 AHRI is the trade association that represents manufacturers of heating products. It was formed on January 1, 2008, by the merger of GAMA, which
formerly represented these manufacturers, and the Air-Conditioning and Refrigeration Institute. As stated previously, AHRI maintains a Consumers Directory of Certified Product Performance for direct heating equipment, which can be found on AHRIs website at: www.ahridirectory.org/Search/
SearchHome?ReturnUrl=%2f.

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