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Federal Register / Vol. 86, No. 87 / Friday, May 7, 2021 / Proposed Rules TABLE III.3CIRCULATOR PUMP OPERATING HOURS IN HOT WATER RECIRCULATION
Fraction of consumers
Control type
Sector
No Control

Residential
Commercial
Residential

Timer

HPY

50%

8,760

Constant Operation.

25%

7,300

50% operate constantly and 50% operate 16 hours/
day.
50% operate constantly and 50% operate 12 hours/
day.
3 hours per day.

Commercial
Aquastat
On Demand

Notes
6,570

Residential
Commercial
Residential
Commercial

20%

1,095

5%

61
122

10 minutes per day .
20 minutes per day .

Assuming that circulator pumps operate for 30 seconds for each demand push
F. Life-Cycle Cost and Payback Period Analyses DOE conducts the LCC and PBP
analyses to evaluate the economic effects of potential energy conservation standards for circulator pumps and
Table 111.4 Circulator Pum Application
Efficiency Level
without new and/or amended standards, and uses efficiency market shares to characterize the no-new-standards case equipment mix. By accounting for consumers who already purchase more efficient equipment, DOE avoids overstating the potential benefits from potential standards. For circulator pumps, the CPWG reviewed the market efficiency distribution for circulator pumps by efficiency level, circulator variety e.g., CP1, CP2, CP3, horsepower rating, and application. The data used to develop the no-newstandards case were confidential manufacturer shipments data from 2015.
Table III.4 shows the no-new-standards efficiency distribution in 2015, as agreed by the CPWG. Docket No. EERE
2016BTSTD0004, No. 99 at pp. 206
208. Note that due to confidentiality concerns, the actual market shares are not shown, and instead market availability is depicted by X.

SVIL pumps on individual customers.
For any given efficiency level, DOE
measures the PBP and the change in LCC relative to an estimated baseline level. The LCC is the total customer expense over the life of the equipment, consisting of purchase, installation, and operating costs expenses for energy use, maintenance, and repair. Inputs to the calculation of total installed cost include the cost of the equipment which includes the MSP, distribution channel markups, and sales taxesand installation costs. Inputs to the calculation of operating expenses include annual energy consumption, energy prices and price projections, repair and maintenance costs, equipment lifetimes, discount rates, and the year that compliance with new and amended standards is required.
DOE measures savings of potential standards relative to a no-newstandards case that reflects conditions
Distribution in 2015

N

"

N

1 hp
1/6 hp
1/25 hp "

N

"

"

ELO
X X
X X
X X
X ELI
X X
X X
X X
X EL2
X EL3
X X
X X
EL4
X X
X X
Hot Water ELO
X X
X X
X X
X Recirculation ELI
X X
X X
X X
EL2
X X
EL3
X X
X X
EL4
The CPWG agreed that EL4 was not viable for circulator pumps used in hot water recirculation.

X
X X

Heating
DOE requests feedback and data on whether any changes in the circulator pump market since 2015 have affected
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the market efficiency distribution of circulator pumps, and if so, how. DOE

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X

also requests information on the current efficiency distribution of SVIL pumps.
DOE requests data and information on the installation costs of SVIL pumps,
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DOE requests information on any updated or recent data sources, such as circulator pump field metering studies, to inform and validate the circulator pump operating hours in the residential and commercial sectors and across all applications. DOE also requests comment on whether there have been any technology or market changes since the term sheet to warrant a different approach on the circulator pump operating hours.
DOE requests input on the operating hours for SVIL pumps by sector and application, and specifically, whether a similar approach should be followed for SVIL pumps, as the one used to estimate operating hours for circulator pumps.