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

Among 61 certified models in this data, water heaters (electric) under 18" wide cost $125 to $284 a year to run at the U.S. average electricity rate (18.3¢/kWh) — a median of $165.

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

The median model here runs $165 a year, 25% less than the $222 median across all certified water heaters (electric).

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

The Eco-Logical OMNI-50HP1-1A costs about $125 a year at the U.S. average rate (681 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 June 2026

Water Heaters (Electric) · 61 certified models

Water Heaters (Electric) Under 18" Wide

61 certified water heaters (electric) under 18" wide appear in this data, costing $125 to $284 a year to run at the U.S. average rate — median $165.

The 50 most efficient (of 61)

Water Heaters (Electric) Under 18" Wide, ranked by certified annual kWh
#	Model	kWh/yr	$/yr (US avg)
1	Eco-Logical OMNI-50HP1-1A	681	$125
2	Eco-Logical OMNI-50HP2-1A	769	$141
3	Friedrich PROH40 T0 FD120-M	780	$143
4	Friedrich PROH40 T0 FD120-MSO	780	$143
5	A. O. Smith HPS10-50H45DV 2	831	$152
6	A. O. Smith HPSN10-50H45DV 2	831	$152
7	A. O. Smith HPTS-50 2	831	$152
8	American HPS10250H045DV 2	831	$152
9	Lochinvar HPSA050KD 2	831	$152
10	RELIANCE WATER HEATERS 10-50-DHPTS 2	831	$152
11	State HPSX-50-DHPT 2	831	$152
12	Friedrich PROH40 T2 FD310BM	879	$161
13	Friedrich PROH40 T2 FD310UM	879	$161
14	A. O. Smith CAHP-50 2	883	$162
15	A. O. Smith HPA10-50H45DV 2	883	$162
16	A. O. Smith HPTA-50 2	883	$162
17	American HPA10250H045DV 2	883	$162
18	Lochinvar CHPA-50 2	883	$162
19	Lochinvar HPPA050KD 2	883	$162
20	RELIANCE WATER HEATERS 10-50-DHPTA 2	883	$162
21	State CSHP-50 2	883	$162
22	State HPAX-50-DHPT 2	883	$162
23	A. O. Smith HP1050H45DV 1	902	$165
24	A. O. Smith HP1050H45DVCTA-1	902	$165
25	A. O. Smith HPTU-50CTA 1	902	$165
26	A. O. Smith HPTU-50DR 1	902	$165
27	A. O. Smith HPTU-50N 1	902	$165
28	American HPHE10250H045DVCTA-1	902	$165
29	American HPHE10250H045DVDR 1	902	$165
30	American HPHE10250H045DVN 1	902	$165
31	Lochinvar HPA052KD 1	902	$165
32	RELIANCE WATER HEATERS 10-50-DHPHTCTA 1	902	$165
33	RELIANCE WATER HEATERS 10-50-DHPHTNE 1	902	$165
34	State HPX-50-DHPTCTA 1	902	$165
35	State HPX-50-DHPTNE 1	902	$165
36	U.S. Craftmaster HPHE2K50HD045VUN 1	902	$165
37	A. O. Smith HPACO-45 1**+AXST-50T 1	923	$169
38	A. O. Smith HPACO-45 1**+AXST-50TTTP 1	923	$169
39	A. O. Smith HPACO-45C 1**+AXST-50TC 1	923	$169
40	A. O. Smith HPACO-45C 1**+AXST-50TCTTP 1	923	$169
41	American MHPCO-45 1**+MXST-50T 1	923	$169
42	American MHPCO-45 1**+MXST-50TTTP 1	923	$169
43	John Wood JWHPCO-45 1**+JWXST-50T 1	923	$169
44	John Wood JWHPCO-45 1**+JWXST-50TTTP 1	923	$169
45	Lochinvar LHPCO-45 1**+LXST-50T 1	923	$169
46	Lochinvar LHPCO-45 1**+LXST-50TTTP 1	923	$169
47	RELIANCE WATER HEATERS RHPCO-45 1**+RXST-50T 1	923	$169
48	RELIANCE WATER HEATERS RHPCO-45 1**+RXST-50TG 1	923	$169
49	State SHPCO-45 1**+SXST-50T 1	923	$169
50	State SHPCO-45 1**+SXST-50TG 1	923	$169

Other size facets

Questions, answered with the data

How much does it cost to run water heaters (electric) under 18" wide?: Among 61 certified models in this data, water heaters (electric) under 18" wide cost $125 to $284 a year to run at the U.S. average electricity rate (18.3¢/kWh) — a median of $165.
Do water heaters (electric) under 18" wide cost more or less than the average electric water heater?: The median model here runs $165 a year, 25% less than the $222 median across all certified water heaters (electric).
What's the cheapest model among water heaters (electric) under 18" wide?: The Eco-Logical OMNI-50HP1-1A costs about $125 a year at the U.S. average rate (681 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 61)

Other size facets

Questions, answered with the data

Keep digging