Data through April 2026
Water Heaters (Electric) · 9 certified models
Giant
Giant: 9 ENERGY STAR certified models in this data, running $172 to $253 a year at the U.S. average electricity rate — a median of $174, versus $204 across every certified water heaters (electric).
All certified models
| # | Model | kWh/yr | $/yr (US avg) |
|---|---|---|---|
| 1 | Giant GTHPCO-45 1**+GTXST-50LBTTP 1 | 915 | $172 |
| 2 | Giant GTHPCO-45 1**+GTXST-50S 1 | 923 | $174 |
| 3 | Giant GTHPCO-45 1**+GTXST-50STTP 1 | 923 | $174 |
| 4 | Giant GTHPCO-45 1**+GTXST-50T 1 | 923 | $174 |
| 5 | Giant GTHPCO-45 1**+GTXST-50TTTP 1 | 923 | $174 |
| 6 | Giant GTHPCO-45 1**+GTXST-80 1 | 1,306 | $246 |
| 7 | Giant GTHPCO-45 1**+GTXST-80TTP 1 | 1,306 | $246 |
| 8 | Giant GTHPCO-45 1**+GTXST-66 1 | 1,341 | $253 |
| 9 | Giant GTHPCO-45 1**+GTXST-66TTP 1 | 1,341 | $253 |
Other brand facets
Questions, answered with the data
- How much does it cost to run Giant water heaters (electric)?
- Among 9 certified models in this data, Giant water heaters (electric) cost $172 to $253 a year to run at the U.S. average electricity rate (18.8¢/kWh) — a median of $174.
- Do Giant water heaters (electric) 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 Giant water heaters (electric)?
- The Giant GTHPCO-45 1**+GTXST-50LBTTP 1 costs about $172 a year at the U.S. average rate (915 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.