How much does it cost to run water heaters (electric) under 18" wide?

Among 69 certified models in this data, water heaters (electric) under 18" wide cost $121 to $292 a year to run at the U.S. average electricity rate (18.8¢/kWh) — a median of $170.

Do water heaters (electric) under 18" wide cost more or less than the average electric water heater?

The median model here runs $170 a year, 17% less than the $204 median across all certified water heaters (electric).

What's the cheapest model among water heaters (electric) under 18" wide?

The Friedrich PROH40 T2 FD400-15 costs about $121 a year at the U.S. average rate (643 kWh/yr) — the lowest certified figure in this group.

What does the certified annual-kWh figure assume for water heaters (electric)?

The certified annual kWh comes from the DOE Uniform Energy Factor test, which simulates a typical household's daily hot-water draw pattern. Only electric models (including heat-pump units) are listed — gas models burn gas, not kWh.

Data through April 2026

Water Heaters (Electric) · 69 certified models

Water Heaters (Electric) Under 18" Wide

69 certified water heaters (electric) under 18" wide appear in this data, costing $121 to $292 a year to run at the U.S. average rate — median $170.

The 50 most efficient (of 69)

Water Heaters (Electric) Under 18" Wide, ranked by certified annual kWh
#	Model	kWh/yr	$/yr (US avg)
1	Friedrich PROH40 T2 FD400-15	643	$121
2	Rheem PROPH40 T2 RH375-15	643	$121
3	Rheem XE40T10H22U0	643	$121
4	Richmond 10E40-HP515	643	$121
5	Ruud PROUH40 T2 RU375-15	643	$121
6	Eco-Logical OMNI-50HP1-1A	681	$128
7	Eco-Logical OMNI-50HP2-1A	769	$145
8	Friedrich PROH40 T0 FD120-M	780	$147
9	Friedrich PROH40 T0 FD120-MSO	780	$147
10	A. O. Smith HPS10-50H45DV 2	831	$156
11	A. O. Smith HPSN10-50H45DV 2	831	$156
12	A. O. Smith HPTS-50 2	831	$156
13	American HPS10250H045DV 2	831	$156
14	Lochinvar HPSA050KD 2	831	$156
15	RELIANCE WATER HEATERS 10-50-DHPTS 2	831	$156
16	State HPSX-50-DHPT 2	831	$156
17	Rheem PROPH40 T2 RH375-30	859	$162
18	Rheem PROPH40 T2 RH375-SO	859	$162
19	Rheem XE40T10H45U0	859	$162
20	Rheem XE40T10HS45U0	859	$162
21	Ruud PROUH40 T2 RU375-30	859	$162
22	Ruud PROUH40 T2 RU375-SO	859	$162
23	Friedrich PROH40 T2 FD310BM	879	$166
24	Friedrich PROH40 T2 FD310UM	879	$166
25	A. O. Smith HPA10-50H45DV 2	883	$166
26	A. O. Smith HPTA-50 2	883	$166
27	American HPA10250H045DV 2	883	$166
28	Lochinvar HPPA050KD 2	883	$166
29	RELIANCE WATER HEATERS 10-50-DHPTA 2	883	$166
30	State HPAX-50-DHPT 2	883	$166
31	A. O. Smith HP1050H45DV 1	902	$170
32	A. O. Smith HP1050H45DVCTA-1	902	$170
33	A. O. Smith HPTU-50CTA 1	902	$170
34	A. O. Smith HPTU-50DR 1	902	$170
35	A. O. Smith HPTU-50N 1	902	$170
36	American HPHE10250H045DVCTA-1	902	$170
37	American HPHE10250H045DVDR 1	902	$170
38	American HPHE10250H045DVN 1	902	$170
39	Lochinvar HPA052KD 1	902	$170
40	RELIANCE WATER HEATERS 10-50-DHPHTCTA 1	902	$170
41	RELIANCE WATER HEATERS 10-50-DHPHTNE 1	902	$170
42	State HPX-50-DHPTCTA 1	902	$170
43	State HPX-50-DHPTNE 1	902	$170
44	U.S. Craftmaster HPHE2K50HD045VUN 1	902	$170
45	A. O. Smith HPACO-45 1**+AXST-50T 1	923	$174
46	A. O. Smith HPACO-45 1**+AXST-50TTTP 1	923	$174
47	A. O. Smith HPACO-45C 1**+AXST-50TC 1	923	$174
48	A. O. Smith HPACO-45C 1**+AXST-50TCTTP 1	923	$174
49	American MHPCO-45 1**+MXST-50T 1	923	$174
50	American MHPCO-45 1**+MXST-50TTTP 1	923	$174

Other size facets

Questions, answered with the data

How much does it cost to run water heaters (electric) under 18" wide?: Among 69 certified models in this data, water heaters (electric) under 18" wide cost $121 to $292 a year to run at the U.S. average electricity rate (18.8¢/kWh) — a median of $170.
Do water heaters (electric) under 18" wide cost more or less than the average electric water heater?: The median model here runs $170 a year, 17% less than the $204 median across all certified water heaters (electric).
What's the cheapest model among water heaters (electric) under 18" wide?: The Friedrich PROH40 T2 FD400-15 costs about $121 a year at the U.S. average rate (643 kWh/yr) — the lowest certified figure in this group.
What does the certified annual-kWh figure assume for water heaters (electric)?: The certified annual kWh comes from the DOE Uniform Energy Factor test, which simulates a typical household's daily hot-water draw pattern. Only electric models (including heat-pump units) are listed — gas models burn gas, not kWh.

The 50 most efficient (of 69)

Other size facets

Questions, answered with the data

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