Little Home Appliance

68 40 gal Electric Water Heaters, Ranked by Running Cost

Electric water heaters (including heat pump models), 40 gal or less, sold in the US. Ranked cheapest to run first, estimated at 18.31¢/kWh (July 2026).

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All models here are heat pump water heaters — ENERGY STAR does not appear to certify standard electric-resistance tanks, only the far more efficient heat pump type. "Split system," "120V integrated" and "240V integrated" below are different installation types, not efficiency tiers.

68 ENERGY STAR certified models, from about $118 to $168 a year in electricity to run at the US average rate. See how we calculate running costs.

Top 5 cheapest to run

#1 240V integrated

Ruud PROUH40 T2 RU375-15

36 gal · 643 kWh/yr

Est. $118/year to run

#2 240V integrated

Rheem XE40T10H22U0

36 gal · 643 kWh/yr

Est. $118/year to run

#3 240V integrated

Rheem PROPH40 T2 RH375-15

36 gal · 643 kWh/yr

Est. $118/year to run

#4 240V integrated

Richmond 10E40-HP5U15

36 gal · 643 kWh/yr

Est. $118/year to run

#5 240V integrated

Rheem PROPH40 T2 RH400-15

36 gal · 643 kWh/yr

Est. $118/year to run

All 68 models

Rank Brand Model Install type Capacity Energy use Est. cost/year
1 Ruud PROUH40 T2 RU375-15 240V integrated 36 gal 643 kWh/yr $118
2 Rheem XE40T10H22U0 240V integrated 36 gal 643 kWh/yr $118
3 Rheem PROPH40 T2 RH375-15 240V integrated 36 gal 643 kWh/yr $118
4 Richmond 10E40-HP5U15 240V integrated 36 gal 643 kWh/yr $118
5 Rheem PROPH40 T2 RH400-15 240V integrated 36 gal 643 kWh/yr $118
6 Ruud PROUH40 T2 RU400-15 240V integrated 36 gal 643 kWh/yr $118
7 Rheem XE40T10H22U1 240V integrated 36 gal 643 kWh/yr $118
8 Friedrich PROH40 T2 FD400-15 240V integrated 36 gal 643 kWh/yr $118
9 GE PF40S10FPY01 120V integrated 40 gal 724 kWh/yr $133
10 GE PH40S10BPY01 240V integrated 40 gal 773 kWh/yr $142
11 Rheem XE40T10HM00U0 120V integrated 36 gal 780 kWh/yr $143
12 Ruud PROUH40 T0 RU120-M 120V integrated 36 gal 780 kWh/yr $143
13 Rheem XE40T10HMS00U0 120V integrated 36 gal 780 kWh/yr $143
14 Ruud PROUH40 T0 RU120-MSO 120V integrated 36 gal 780 kWh/yr $143
15 Richmond 10E40-HP120M 120V integrated 36 gal 780 kWh/yr $143
16 Richmond 10E40-HP120MS 120V integrated 36 gal 780 kWh/yr $143
17 Rheem PROPH40 T0 RH120-M 120V integrated 36 gal 780 kWh/yr $143
18 Rheem PROPH40 T0 RH120-MSO 120V integrated 36 gal 780 kWh/yr $143
19 Friedrich PROH40 T0 FD120-M 120V integrated 36 gal 780 kWh/yr $143
20 Friedrich PROH40 T0 FD120-MSO 120V integrated 36 gal 780 kWh/yr $143
21 Rheem PROPH40 T2 RH375-30 240V integrated 36 gal 859 kWh/yr $157
22 Ruud PROUH40 T2 RU375-SO 240V integrated 36 gal 859 kWh/yr $157
23 Richmond 10E40-HP530 240V integrated 36 gal 859 kWh/yr $157
24 Rheem XE40T10H45U0 240V integrated 36 gal 859 kWh/yr $157
25 Richmond 10E40-HP5S30 240V integrated 36 gal 859 kWh/yr $157
26 Ruud PROUH40 T2 RU375-30 240V integrated 36 gal 859 kWh/yr $157
27 Rheem XE40T10HS45U0 240V integrated 36 gal 859 kWh/yr $157
28 Rheem PROPH40 T2 RH375-SO 240V integrated 36 gal 859 kWh/yr $157
29 Richmond 10E40-HP5U30 240V integrated 36 gal 859 kWh/yr $157
30 Richmond 10E40-HP5US30 240V integrated 36 gal 859 kWh/yr $157
31 Rheem PROPH40 T2 RH400-30 240V integrated 36 gal 859 kWh/yr $157
32 Rheem PROPH40 T2 RH400-SO 240V integrated 36 gal 859 kWh/yr $157
33 Ruud PROUH40 T2 RU400-30 240V integrated 36 gal 859 kWh/yr $157
34 Rheem XE40T10H45U1 240V integrated 36 gal 859 kWh/yr $157
35 Ruud PROUH40 T2 RU400-SO 240V integrated 36 gal 859 kWh/yr $157
36 Rheem XE40T10HS45U1 240V integrated 36 gal 859 kWh/yr $157
37 Friedrich PROH40 T2 FD400-SO 240V integrated 36 gal 859 kWh/yr $157
38 Friedrich PROH40 T2 FD400-30 240V integrated 36 gal 859 kWh/yr $157
39 Ruud PROUH40 T2 RU400-Z30 240V integrated 36 gal 859 kWh/yr $157
40 Richmond 10E40-HP5UZ30 240V integrated 36 gal 859 kWh/yr $157
41 Rheem XE40T10HZ45U1 240V integrated 36 gal 859 kWh/yr $157
42 Rheem PROPH40 T2 RH400-Z30 240V integrated 36 gal 859 kWh/yr $157
43 Friedrich PROH40 T2 FD400-Z30 240V integrated 36 gal 859 kWh/yr $157
44 Ruud PRO H40 T2 RU310UM 240V integrated 36 gal 879 kWh/yr $161
45 Ruud PRO H40 T2 RU310BM 240V integrated 36 gal 879 kWh/yr $161
46 Rheem PRO H40 T2 RH310UM 240V integrated 36 gal 879 kWh/yr $161
47 Rheem PRO H40 T2 RH310BM 240V integrated 36 gal 879 kWh/yr $161
48 Friedrich PROH40 T2 FD310BM 240V integrated 36 gal 879 kWh/yr $161
49 Friedrich PROH40 T2 FD310UM 240V integrated 36 gal 879 kWh/yr $161
50 Ruud PROUH40 T2 RU350BM 240V integrated 36 gal 879 kWh/yr $161
51 Friedrich PROH40 T2 FD350BM 240V integrated 36 gal 879 kWh/yr $161
52 Rheem PROUH40 T2 RH350BM 240V integrated 36 gal 879 kWh/yr $161
53 Friedrich PROH40 T2 FD350UM 240V integrated 36 gal 879 kWh/yr $161
54 Ruud PROUH40 T2 RU350UM 240V integrated 36 gal 879 kWh/yr $161
55 Rheem PROUH40 T2 RH350UM 240V integrated 36 gal 879 kWh/yr $161
56 Lochinvar HPPA040KD 2** 240V integrated 36 gal 902 kWh/yr $165
57 American HPA10240H045DV 2** 240V integrated 36 gal 902 kWh/yr $165
58 A. O. Smith HPTA-40 2** 240V integrated 36 gal 902 kWh/yr $165
59 State HPAX-40-DHPT 2** 240V integrated 36 gal 902 kWh/yr $165
60 Reliance Water Heaters 10-40-DHPTA 2** 240V integrated 36 gal 902 kWh/yr $165
61 A. O. Smith HPA10-40H45DV 2** 240V integrated 36 gal 902 kWh/yr $165
62 Lochinvar CHPA-40 2** 240V integrated 36 gal 902 kWh/yr $165
63 State CSHP-40 2** 240V integrated 36 gal 902 kWh/yr $165
64 A. O. Smith CAHP-40 2** 240V integrated 36 gal 902 kWh/yr $165
65 American Standard Water Heaters ASHPWH-40***** 240V integrated 37 gal 907 kWh/yr $166
66 Ariston ARIHPWH-40 240V integrated 37 gal 907 kWh/yr $166
67 Ariston ARIHPWH-40-T 240V integrated 37 gal 915 kWh/yr $168
68 Lennox WHHP040T45MD240S**** 240V integrated 37 gal 915 kWh/yr $168

Estimated running cost = annual kWh × 18.31¢/kWh (July 2026 US average). Your own rate may be higher or lower — check your bill. ENERGY STAR figures are lab-test results; real-world use varies. Gas and propane water heaters are not included — their energy figures cover electronics only, not the fuel that heats the water. This list includes discontinued and not-yet-sold certified models.