1. (a) For the purposes of paragraph (b) of this section, “PEICL” means the constant load pump energy index and “PEIVL” means the variable load pump energy index, both as determined in accordance with the test procedure in § 431.464. For the purposes of paragraph (c) of this section, “BEP” means the best efficiency point as determined in accordance with the test procedure in § 431.464.

2. (b) Each pump that is manufactured starting on January 27, 2020 and that:

   1. (1) Is in one of the equipment classes listed in the table in paragraph (b)(4) of this section;
   2. (2) Meets the definition of a clean water pump in § 431.462;
   3. (3) Is not listed in paragraph (c) of this section; and

   4. (4) Conforms to the characteristics listed in paragraph (d) of this section must have a PEICL or PEIVL rating of not more than 1.00 using the appropriate C-value in the table in this paragraph (b)(4):

      Equipment class 1	Maximum PEI 2	C-value 3
      ESCC.1800.CL	1.00	128.47
      ESCC.3600.CL	1.00	130.42
      ESCC.1800.VL	1.00	128.47
      ESCC.3600.VL	1.00	130.42
      ESFM.1800.CL	1.00	128.85
      ESFM.3600.CL	1.00	130.99
      ESFM.1800.VL	1.00	128.85
      ESFM.3600.VL	1.00	130.99
      IL.1800.CL	1.00	129.30
      IL.3600.CL	1.00	133.84
      IL.1800.VL	1.00	129.30
      IL.3600.VL	1.00	133.84
      RSV.1800.CL	1.00	129.63
      RSV.3600.CL	1.00	133.20
      RSV.1800.VL	1.00	129.63
      RSV.3600.VL	1.00	133.20
      ST.1800.CL	1.00	138.78
      ST.3600.CL	1.00	134.85
      ST.1800.VL	1.00	138.78
      ST.3600.VL	1.00	134.85
      1 Equipment class designations consist of a combination (in sequential order separated by periods) of: (1) An equipment family (ESCC = end suction close-coupled, ESFM = end suction frame mounted/own bearing, IL = in-line, RSV = radially split, multi-stage, vertical, in-line diffuser casing, ST = submersible turbine; all as defined in § 431.462); (2) nominal speed of rotation (1800 = 1800 rpm, 3600 = 3600 rpm); and (3) an operating mode (CL = constant load, VL = variable load). Determination of the operating mode is determined using the test procedure in appendix A to this subpart.
      2 For equipment classes ending in .CL, the relevant PEI is PEICL. For equipment classes ending in .VL, the relevant PEI is PEIVL.
      3 The C-values shown in this table must be used in the equation for PERSTD when calculating PEICL or PEIVL, as described in section II.B of appendix A to this subpart.

3. (c) The energy efficiency standards in paragraph (b) of this section do not apply to the following pumps:

   1. (1) Fire pumps;
   2. (2) Self-priming pumps;
   3. (3) Prime-assist pumps;
   4. (4) Magnet driven pumps;
   5. (5) Pumps designed to be used in a nuclear facility subject to 10 CFR part 50, “Domestic Licensing of Production and Utilization Facilities”;
   6. (6) Pumps meeting the design and construction requirements set forth in Military Specification MIL-P-17639F, “Pumps, Centrifugal, Miscellaneous Service, Naval Shipboard Use” (as amended); MIL-P-17881D, “Pumps, Centrifugal, Boiler Feed, (Multi-Stage)” (as amended); MIL-P-17840C, “Pumps, Centrifugal, Close-Coupled, Navy Standard (For Surface Ship Application)” (as amended); MIL-P-18682D, “Pump, Centrifugal, Main Condenser Circulating, Naval Shipboard” (as amended); MIL-P-18472G, “Pumps, Centrifugal, Condensate, Feed Booster, Waste Heat Boiler, And Distilling Plant” (as amended). Military specifications and standards are available for review at http://everyspec.com/MIL-SPECS.

4. (d) The energy conservation standards in paragraph (b) of this section apply only to pumps that have the following characteristics:

   1. (1) Flow rate of 25 gpm or greater at BEP at full impeller diameter;
   2. (2) Maximum head of 459 feet at BEP at full impeller diameter and the number of stages required for testing;
   3. (3) Design temperature range from 14 to 248 °F;

   4. (4) Designed to operate with either:

      1. (i) A 2- or 4-pole induction motor; or
      2. (ii) A non-induction motor with a speed of rotation operating range that includes speeds of rotation between 2,880 and 4,320 revolutions per minute and/or 1,440 and 2,160 revolutions per minute; and
      3. (iii) In either case, the driver and impeller must rotate at the same speed;
   5. (5) For ST pumps, a 6-inch or smaller bowl diameter; and
   6. (6) For ESCC and ESFM pumps, specific speed less than or equal to 5,000 when calculated using U.S. customary units.
5. (e) For the purposes of paragraph (f) of this section, “WEF” means the weighted energy factor and “hhp” means the rated hydraulic horsepower, as determined in accordance with the test procedure in § 431.464(b) and applicable sampling plans in § 429.59 of this chapter.

6. (f) Each dedicated-purpose pool pump that is not a submersible pump and is manufactured starting on July 19, 2021 must have a WEF rating that is not less than the value calculated from the following table:

   Equipment class	Minimumallowable WEF score[kgal/kWh]	Minimum allowable WEF score[kgal/kWh]
   Dedicated-purpose pool pumpvariety	hhp Applicability	Motor phase
   Self-priming pool filter pumps	0.711 hp ≤hhp <2.5 hp	Single	WEF = −2.30 * ln (hhp) + 6.59.
   Self-priming pool filter pumps	hhp <0.711 hp	Single	WEF = 5.55, for hhp ≤0.13 hp −1.30 * ln (hhp) + 2.90, for hhp >0.13 hp.
   Non-self-priming pool filter pumps	hhp <2.5 hp	Any	WEF = 4.60, for hhp ≤0.13 hp −0.85 * ln (hhp) + 2.87, for hhp >0.13 hp.
   Pressure cleaner booster pumps	Any	Any	WEF = 0.42.

7. (g) Each integral cartridge filter pool pump and integral sand filter pool pump that is manufactured starting on July 19, 2021 must be distributed in commerce with a pool pump timer that is either integral to the pump or a separate component that is shipped with the pump.

8. (h) For all dedicated-purpose pool pumps distributed in commerce with freeze protection controls, the pump must be shipped with freeze protection disabled or with the following default, user-adjustable settings:

   1. (1) The default dry-bulb air temperature setting is no greater than 40 °F;
   2. (2) The default run time setting shall be no greater than 1 hour (before the temperature is rechecked); and
   3. (3) The default motor speed shall not be more than 1/2 of the maximum available speed.

9. (i) Each circulator pump that is manufactured starting on May 22, 2028 and that meets the criteria in paragraphs (i)(1) through (i)(2) of this section must have a circulator energy index (“CEI”) rating (as determined in accordance with the test procedure in § 431.464(c)(2)) of not more than 1.00 using the instructions in paragraph (i)(3) of this section and with a control mode as specified in paragraph (i)(4) of this section:

   1. (1) Is a clean water pump as defined in § 431.462.
   2. (2) Is not a submersible pump or a header pump, each as defined in § 431.462.

   3. (3) The relationships in this paragraph (i)(3) are necessary to calculate maximum CEI.

      1. (i) Calculate CEI according to the following equation:

         Equation 1 to Paragraph (i)(3)(i)

         

         Where: CEI = the circulator energy index (dimensionless); CER = the circulator energy rating (hp), determined in accordance with section 6 of appendix D to subpart Y of part 431; and CERSTD = the CER for a circulator pump that is minimally compliant with DOE's energy conservation standards with the same hydraulic horsepower as the rated pump (hp), determined in accordance with paragraph (i)(3)(ii) of this section.

      2. (ii) Calculate CERSTD according to the following equation:

         Equation 2 to Paragraph (i)(3)(ii)

         

         Where: CERSTD = the CER for a circulator pump that is minimally compliant with DOE's energy conservation standards with the same hydraulic horsepower as the rated pump (hp); i = the index variable of the summation notation used to express CERSTD (dimensionless) as described in the table 3 to paragraph (i)(3)(ii), in which i is expressed as a percentage of circulator pump flow at best efficiency point, determined in accordance with the test procedure in § 431.464(c)(2); ωi = the weighting factor (dimensionless) at each corresponding test point, i, as described in table 3 to paragraph (i)(3)(ii); and Piin,STD = the reference power input to the circulator pump driver (hp) at test point i, calculated using the equations and method specified in paragraph (i)(3)(iii) of this section.

         Table 3 to Paragraph (i)(3)(ii)

         I (%)	Corresponding ωi
         25	.25
         50	.25
         75	.25
         100	.25

      3. (iii) Calculate Piin,STD according to the following equation:

         Equation 3 to Paragraph (i)(3)(iii)

         

         Where: Piin,STD = the reference power input to the circulator pump driver at test point i (hp); Pu,i = circulator pump basic model rated hydraulic horsepower (hp) determined in accordance with 10 CFR 429.59(a)(2)(i); αi = part-load efficiency factor (dimensionless) at each test point i as described in table 4 to paragraph (i)(3)(iii); and ηWTW,100% = reference circulator pump wire-to-water efficiency at best efficiency point (%) at the applicable energy conservation standard level, as described in table 5 to paragraph (i)(3)(iii) as a function of circulator pump basic model rated hydraulic horsepower at 100% BEP flow, Pu,100%.

         Table 4 to Paragraph (i)(3)(iii)

         I (%)	Corresponding αi
         25	0.4843
         50	0.7736
         75	0.9417
         100	1

         Table 5 to Paragraph (i)(3)(iii)

         Pu,100 %	ηWTW,100 %
         <1	10*ln(Pu,100 % + 0.001141) + 67.78.
         ≥1	67.79%.

   4. (4) A circulator pump subject to energy conservation standards as described in this paragraph (i) must achieve the maximum CEI as described in paragraph (i)(3)(i) of this section and in accordance with the test procedure in § 431.464(c)(2) in the least consumptive control mode in which it is capable of operating.

[81 FR 4431, Jan. 26, 2016, as amended at 82 FR 5742, Jan. 18, 2017; 89 FR 44536, May 20, 2024]