Carnot Labs, Inc Reservoir 50-Gallon
Carnot Labs, Inc Reservoir 50-Gallon is a heat pump (hybrid electric) water heater from Carnot Labs, Inc with a 47 gallon rated tank and a 75 gallon first-hour rating at a 3.53 UEF.
| Uniform Energy Factor (UEF) | 3.53 |
|---|---|
| Annual electricity use | 1404 kWh/yr |
| Recovery efficiency | 396.4 % |
| Fuel | Electric |
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| First-hour rating | 75 gal |
|---|---|
| Rated storage volume | 47 gal |
| Draw pattern | High |
| Heat pump type | 240 Volt Integrated HPWH |
|---|---|
| Refrigerant (GWP) | R-513A (GWP:630) |
| Compressor low-temp cutoff | 40 °F |
| Input voltage | 240 |
|---|---|
| Max current draw | 21.6 A |
| Smart / connected capable | No |
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| Height | 44.2 in |
|---|---|
| Diameter | 18.9 in |
| ENERGY STAR certified | Yes |
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Who is the Carnot Labs, Inc Reservoir 50-Gallon for?
- Its 75 gallon first-hour rating suits a household of 5+ people under DOE sizing guidance.
- Estimated running cost: about $239/year at the national average electricity rate (1404 kWh/yr certified use).
- Needs a 240 V circuit; at 21.6 A max draw plan for a 30 A breaker (NEC 125% continuous-load rule).
- The heat pump compressor operates down to 40 °F ambient — below that, backup elements take over.
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Frequently asked questions
Is the Carnot Labs, Inc Reservoir 50-Gallon ENERGY STAR certified?
Yes, the Carnot Labs, Inc Reservoir 50-Gallon holds a current ENERGY STAR certification for water heating efficiency (UEF 3.53).
How much does the Carnot Labs, Inc Reservoir 50-Gallon cost to run per year?
About $239 per year at national average energy rates, based on its certified annual energy use under the DOE test draw pattern. Your rate and usage change this figure.
What electrical circuit does the Carnot Labs, Inc Reservoir 50-Gallon need?
The Carnot Labs, Inc Reservoir 50-Gallon runs on a 240 V circuit drawing up to 21.6 A; per the NEC 125% continuous-load rule plan for at least a 30 A breaker (check the installation manual for the required circuit).
Is the Carnot Labs, Inc Reservoir 50-Gallon a smart water heater?
No, the Carnot Labs, Inc Reservoir 50-Gallon is not connected-capable — it has no app connectivity or demand-response support.
Sources
- data.energystar.gov (retrieved 2026-07-17)