A. O. SMITH FPTU-50 1**
3.35 UEF DOE CCD · 2026-09-19Grade B: where this UEF sits among the 426 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
An electric tank, medium draw pattern (a typical three- or four-person household, about 55 gallons on a busy morning).
Checking this model against the registry? This A. O. SMITH FPTU-50 1** uses 970 kWh a year at the medium draw pattern, the standard daily hot-water usage DOE tests against. That is 2,561 kWh below the class median of 3,531 kWh, placing it in the lowest quarter of its class.
Energy use per year
970 kWh a year
Computed by this site from the registry's UEF and the federal test's daily hot-water draw for this draw pattern. What it costs depends on the electricity rate where you live.
That is below the median of 3,531 kWh for the 426 models registered in the same heater type and draw pattern; it ranks 101 of 426, lowest energy first.
Solid line: this model (970 kWh). Dashed line: the class median.
Min 773 kWh Median 3,531 kWh Max 3,569 kWh
What it costs to run where you live
What the registry files
- UEF (Uniform Energy Factor) how much hot water you get for each unit of energy the heater uses
- 3.35 DOE CCD · 2026-09-19 Compared only with other models registered as an electric tank at the medium draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Medium DOE CCD · 2026-09-19
- First Hour Rating how many gallons of hot water the unit can deliver in one hour, starting from a full tank
- 66 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 46 gal DOE CCD · 2026-09-19
- On the market since (ENERGY STAR) the date the manufacturer told ENERGY STAR the model went on sale
- 2019-04-05 ENERGY STAR · 2026-09-19
- Connected / demand response (ENERGY STAR) whether the unit can take signals from your utility to shift when it heats, and by which standard (such as CTA-2045)
- No ENERGY STAR · 2026-09-19
- Refrigerant and GWP (ENERGY STAR) the refrigerant a heat pump unit uses and its global warming potential, a leak's climate effect relative to carbon dioxide (CO2 = 1)
- R-134a, GWP 1430 ENERGY STAR · 2026-09-19
What it costs to install
$3,011–$4,010 installed
Not a quote — a modeled range of what installers have charged for this class of unit; your price will vary with labor rates, access, and local code requirements.
Escalation indexes: equipment (BLS PPI) latest available: August 2026; labor (BLS ECI) latest available: April 2026 to June 2026.
NLR REMDB (BLS PPI/ECI escalated) · 2026-04-01Safety record
No CPSC recall names this model.
Checked against the CPSC recall database. CPSC does not publish a model-level match for this product category, so this list is curated by hand from the manufacturer's recall filings.
CPSC · 2026-09-24Does it fit your space?
Enter your own numbers below — this compares them to what ENERGY STAR publishes for this model, it does not tell you what to buy.
- Compressor operating range (ENERGY STAR)
- the air temperatures around the unit in which its heat pump runs; outside this range the heat pump stops
- Dimensions (ENERGY STAR)
- the unit's filed height, width, depth or tank diameter, in inches
- Input voltage and maximum current (ENERGY STAR)
- the circuit voltage the unit is certified on and the most current it draws
What these figures mean
How this compares
The closest models in the same class — same fuel, type and draw pattern.
Keep going
How every figure on this page is calculated
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Find what replaces your water heater
Enter the model number off your old unit and see what is on file today, with the yearly cost difference.
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Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
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What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
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What size heat pump water heater do I need?
Answered from what models in this size actually file.
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Water heaters
Every model on file with the Department of Energy, by heater type.
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All heat pump water heaters
Electric tanks that file a UEF of 2.0 or more — the registry has no separate heat pump type, so this site draws the line there.
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Every A. O. SMITH model on file
What this brand files, by heater type.
UEF 3.35 · Grade B Price it on your ZIP
The registry lists a UEF, the ratio of hot water delivered to energy used, of 3.35 for this model. This site combines that UEF with the daily hot-water draw of the DOE test for the medium draw pattern. The result is 970 kWh, from DOE CCD data retrieved 2026-09-19. It is a calculated figure, not a measurement taken in a home. The comparison class is the 426 models registered as an electric tank at the medium draw pattern. Their median is 3,531 kWh, so this model sits 2,561 kWh below it. It ranks 101st lowest for energy use among 426, which is the lowest quarter of the class. The calculation method is documented on its own page.
This figure applies to a household whose hot-water use matches the medium draw pattern. The rated volume is 46 gallons. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 66 gallons. Both values come from the registry entry for FPTU-50 1**. A household that uses more hot water than the medium draw pattern will use more than 970 kWh. The data here does not show by how much, so that amount is not available. The figure also says nothing about a different fuel or tank size. The selector by fuel, space and size covers those comparisons.
The running cost is not stated in this text because it depends on your own utility electricity tariff. The cost calculator applies the rate for your ZIP to 970 kWh. A higher rate raises the cost of that same 970 kWh, while the energy figure stays the same. The gap of 2,561 kWh from the class median of 3,531 kWh also converts to cost at your rate. The resulting amount is not available in this data. The installed price range is shown in its own block with its source and date. It is a modeled installed-cost range, not a quote. To look for a same-class replacement, search by model number.
DOE CCD · 2026-09-19