Running cost for the Giant GTHPCO-45 1**+GTXST-50STTP 1*
The Giant GTHPCO-45 1**+GTXST-50STTP 1* is certified by ENERGY STAR at 923 kWh a year, cheaper than most models in its category to run among electric water heaters currently certified.
That $174 is priced at 18.8¢/kWh, the average of all 51 state rates this site tracks. Your own state's rate is one click away.
Efficient, or not, for a electric water heater
Against the category average of 1,105 kWh/yr, this model uses 16.5% less, ranking 221 of 596 electric water heaters tracked here for running cost. That average is drawn from all 596 electric water heaters ENERGY STAR currently certifies, not an outside number, a $34/year gap from this model at the national rate. Full sourcing is in the sourcing notes.
Right next to it on the list
A rank or two either side of the Giant GTHPCO-45 1**+GTXST-50STTP 1*: Giant GTHPCO-45 1**+GTXST-50S 1** ($174/yr, 923 kWh/yr), then Giant GTHPCO-45 1**+GTXST-50STTP 1** ($174/yr, 923 kWh/yr).
Same brand, different models
Ranked 6 of Giant's 13 certified electric water heaters, this sits between the GTHPCO-45 1**+GTXST-50LBTTP 1* ($172/yr, the brand's cheapest) and the GTHPCO-45 1**+GTXST-66TTP 1** ($252/yr, its priciest).
Giant GTHPCO-45 1**+GTXST-50STTP 1* over 11 years
NAHB's Study of Life Expectancy of Home Components puts a typical electric water heater's service life at 11 years; run the Giant GTHPCO-45 1**+GTXST-50STTP 1* that long and it costs about $1,909 in electricity, on top of whatever it cost to buy.
Shopping for a new one
Efficient as certified electric water heaters go, $174/year is a reasonable baseline if you're comparing what else is on the market.
See what else is certified in this category before you decide.
If you're keeping it
A electric water heater like the Giant GTHPCO-45 1**+GTXST-50STTP 1* is a real household expense whether or not it needs replacing yet; a protection plan is one way to budget for a repair rather than a full replacement.
Where this number comes from
The full Electric Water Heater category page shows all 596 electric water heaters ranked by cost; the state-rate guide covers the half of this number that isn't the appliance. The 923 kWh/yr figure is ENERGY STAR's own certification, not a wattage estimate; exact dataset IDs are on the data sources page.