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Federal Register / Vol. 86, No. 223 / Tuesday, November 23, 2021 / Rules and Regulations
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TABLE III.8AVERAGE ENERGY CONSUMPTION FOR THE VENTED HEATER PRODUCT CLASSES FROM APRIL 2010 FINAL
RULEContinued Average energy consumption Efficiency level AFUE

DHE type
Heat circulation type
Gas Floor

All

Gas Room

All

70
57
58
64
65
66
67
68
83

Gas MMBtu/yr 26.5
30.8
30.3
27.5
27.1
26.7
26.3
26.0
20.2

Electricity kWh/yr 17.7
0.0
0.0
0.0
0.0
0.0
0.0
0.0
81.1

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.

The Joint Advocates stated that in the February 2015 NOPR for hearth products, DOE analysis showed that 40
percent of the consumers of hearth products leave standing pilot lights on all year and that the average operating hours for standing pilot lights is close to 4,000 hours per year. Id. CA IOUs asserted that vented heaters are not often used in an on/off configuration and that intermittent heating use during shoulder seasons will also lead to wasted energy if the standing pilot light is burning the whole time but the heater is only used during small portions of the day. CA IOUs, No. 21 at p. 20
DOE notes that the estimates developed for the April 2010 final rule assumes that 100 percent of consumers have the pilot on year-round, so the impact of pilot use is considered in this analysis. DOE believes that the fraction of vented heaters that have standing pilot on during the non-heating season is likely much higher than for hearth products, but likely not 100 percent.
Therefore, the April 2010 final rule analysis likely overestimates the potential energy savings from electronic ignition since a fraction of consumers might turn the standing pilot off during the non-heating season. DOE also notes that standing pilot energy use during the shoulder season could offset some time that the main burner would be on, which is not considered in the April 2010 final rule analysis, and could offset some of the energy savings as well.

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f. Life-Cycle Cost and Payback Period Analysis LCC is the total consumer expense over the life of an appliance, including the total installed cost and operating costs including energy expenditures, maintenance, and repair. DOE
discounts future operating costs to the
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time of purchase, and sums them over the lifetime of the product.
The total installed cost is determined by combining the installation cost with the equipment price. The equipment price is determined using the MPC and applying a manufacturer mark-up, a wholesaler mark-up, a mechanical contractor mark-up, and sales tax.20 As presented in section III.B.3.d. of this document, DOE has determined that the MPC has not changed significantly since the April 2010 final rule. DOE has also concluded that the average mark-ups, sales taxes, and installation costs are comparable to the estimates developed for the April 2010 final rule. Therefore, the total installed costs for the products and efficiency levels that are still on the market and were evaluated during the April 2010 final rule are estimated to have remained approximately the same given that the analyzed technology options have not changed. As discussed in section II.B.3.b., condensing gas wall fan type vented heaters came on the market between the April 2010 final rule and October 2016 final determination. DOE additionally estimates that the total installed cost for the 90-percent AFUE gas wall fan type vented heater would be considerably higher compared to lower efficiency gas wall fan type vented heaters, since there are considerable development and production costs as discussed in section III.B.3.d. of this document, as well as additional installation costs.
The annual operating cost is determined by the energy consumption of vented heaters, the energy prices of the fuel used, and any repair and 20 For new construction, builder mark-up is also included. For the April 2010 final rule, the new construction market shares are 10 percent for vented gas wall fan, vented gas wall gravity, and vented gas room heaters, and 0 percent for vented gas floor furnace heaters.

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maintenance costs that would be required. DOE has determined that the energy consumption as discussed in section III.B.3.e. of this document and repair and maintenance costs associated with each efficiency level have not changed significantly from that in the April 2010 final rule for the vented heaters that are still on the market, as the technology options have not changed. DOE additionally estimates that the average energy consumption for the 90-percent AFUE gas wall fan type vented heater would be proportionally lower compared to the 80-percent AFUE
gas wall fan type vented heaters, and repair and maintenance costs would be higher than for the 80-percent AFUE gas wall fan type vented heaters. To assess the impact of energy prices, DOE
compared the April 2010 final rules average energy prices for 2013 i.e., the starting year in the analysis to a likely starting year if DOE performed a revised analysis in a new rulemaking. The April 2010 final rule used Energy Information Administrations EIA Annual Energy Outlook AEO 2010 energy price trends.21 To assess the impact of updated energy price estimates, DOE
used EIAs AEO 2021 energy price trends to estimate the energy prices in 2027,22 the expected compliance year for the updated analysis.23 Both the 21 U.S. Department of EnergyEnergy Information Administration, Annual Energy Outlook 2010 with Projections to 2035 Early Release Available at: www.eia.gov/outlooks/aeo/
Last accessed July 20, 2021.
22 For purposes of the updated analysis, DOE
estimated 2027 as the first year of compliance by assuming that the publication of a potential final rule would occur by 2022 and any amended standards would apply to DHEs manufactured 5
years after this date. 42 U.S.C. 6295m4Aii 23 U.S. Department of EnergyEnergy Information Administration, Annual Energy Outlook 2021 with Projections to 2050 Available at:

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