WattCost

Data through April 2026

Water Heaters (Electric) · 96 certified models

Split-System Heat Pump Water Heaters

This configuration accounts for 96 of the 566 certified water heaters (electric) in this data. At national-average electricity rates they cost $128–$328 a year — median $174 against a category-wide median of $204.

The 50 most efficient (of 96)

Split-System Heat Pump Water Heaters, ranked by certified annual kWh
#ModelkWh/yr$/yr (US avg)
1Eco-Logical OMNI-50HP1-1A681$128
2Eco-Logical OMNI-50HP2-1A769$145
3SANCO2 GS5-45HPC-D HP + ECO-43SSAQB868$163
4SANCO2 GS5-45HPC HP + ECO-43SSAQB868$163
5Smart Solar SSG2-ES 65893$168
6A. O. Smith HPACO-45 1**+AXST-50LBTTP 1915$172
7A. O. Smith HPACO-45C 1**+AXST-50LBCTTP 1915$172
8American MHPCO-45 1**+MXST-50LBTTP 1915$172
9Giant GTHPCO-45 1**+GTXST-50LBTTP 1915$172
10GSW WATER HEATERS GHPCO-45 1**+GXST-50LBTTP 1915$172
11John Wood JWHPCO-45 1**+JWXST-50LBTTP 1915$172
12Lochinvar LHPCO-45 1**+LXST-50LBTTP 1915$172
13RELIANCE WATER HEATERS RHPCO-45 1**+RXST-50LBG 1915$172
14State SHPCO-45 1**+SXST-50LBG 1915$172
15A. O. Smith HPACO-45 1**+AXST-50S 1923$174
16A. O. Smith HPACO-45 1**+AXST-50STTP 1923$174
17A. O. Smith HPACO-45 1**+AXST-50T 1923$174
18A. O. Smith HPACO-45 1**+AXST-50TTTP 1923$174
19A. O. Smith HPACO-45C 1**+AXST-50SC 1923$174
20A. O. Smith HPACO-45C 1**+AXST-50SCTTP 1923$174
21A. O. Smith HPACO-45C 1**+AXST-50TC 1923$174
22A. O. Smith HPACO-45C 1**+AXST-50TCTTP 1923$174
23American MHPCO-45 1**+MXST-50S 1923$174
24American MHPCO-45 1**+MXST-50STTP 1923$174
25American MHPCO-45 1**+MXST-50T 1923$174
26American MHPCO-45 1**+MXST-50TTTP 1923$174
27Giant GTHPCO-45 1**+GTXST-50S 1923$174
28Giant GTHPCO-45 1**+GTXST-50STTP 1923$174
29Giant GTHPCO-45 1**+GTXST-50T 1923$174
30Giant GTHPCO-45 1**+GTXST-50TTTP 1923$174
31GSW WATER HEATERS GHPCO-45 1**+GXST-50S 1923$174
32GSW WATER HEATERS GHPCO-45 1**+GXST-50STTP 1923$174
33GSW WATER HEATERS GHPCO-45 1**+GXST-50T 1923$174
34GSW WATER HEATERS GHPCO-45 1**+GXST-50TTTP 1923$174
35John Wood JWHPCO-45 1**+JWXST-50STTP 1923$174
36John Wood JWHPCO-45 1**+JWXST-50T 1923$174
37John Wood JWHPCO-45 1**+JWXST-50TTTP 1923$174
38Lochinvar LHPCO-45 1**+LXST-50S 1923$174
39Lochinvar LHPCO-45 1**+LXST-50STTP 1923$174
40Lochinvar LHPCO-45 1**+LXST-50T 1923$174
41Lochinvar LHPCO-45 1**+LXST-50TTTP 1923$174
42RELIANCE WATER HEATERS RHPCO-45 1**+RXST-50S 1923$174
43RELIANCE WATER HEATERS RHPCO-45 1**+RXST-50SG 1923$174
44RELIANCE WATER HEATERS RHPCO-45 1**+RXST-50T 1923$174
45RELIANCE WATER HEATERS RHPCO-45 1**+RXST-50TG 1923$174
46State SHPCO-45 1**+SXST-50S 1923$174
47State SHPCO-45 1**+SXST-50SG 1923$174
48State SHPCO-45 1**+SXST-50T 1923$174
49State SHPCO-45 1**+SXST-50TG 1923$174
50Smart Solar SSG2-ES 801,192$224

Other type facets

Questions, answered with the data

How much does it cost to run split-system heat pump water heaters?
Among 96 certified models in this data, split-system heat pump water heaters cost $128 to $328 a year to run at the U.S. average electricity rate (18.8¢/kWh) — a median of $174.
Do split-system heat pump water heaters cost more or less than the average electric water heater?
The median model here runs $174 a year, 15% less than the $204 median across all certified water heaters (electric).
What's the cheapest model among split-system heat pump water heaters?
The Eco-Logical OMNI-50HP1-1A costs about $128 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.

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