Cala Systems, Inc RDH6524M1 65-Gallon
Cala Systems, Inc RDH6524M1 65-Gallon is a heat pump (hybrid electric) water heater from Cala Systems, Inc with a 65 gallon rated tank and a 79 gallon first-hour rating at a 3.61 UEF.
| Uniform Energy Factor (UEF) | 3.61 |
|---|---|
| Recovery efficiency | 4.2 % |
| Fuel | Electric |
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| First-hour rating | 79 gal |
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| Rated storage volume | 65 gal |
| Draw pattern | High |
| Heat pump type | 240 Volt Integrated HPWH |
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| Refrigerant (GWP) | R-513A (GWP:630) |
| Input voltage | 240 |
|---|---|
| Max current draw | 30 A |
| Smart / connected capable | No |
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| ENERGY STAR certified | Yes |
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Who is the Cala Systems, Inc RDH6524M1 65-Gallon for?
- Its 79 gallon first-hour rating suits a household of 5+ people under DOE sizing guidance.
- Needs a 240 V circuit; at 30 A max draw plan for a 40 A breaker (NEC 125% continuous-load rule).
Similar water heaters
- A. O. Smith Heat Pump 65-Gallon (FPTU-66 1) (UEF 3.42)
- A. O. Smith Heat Pump 65-Gallon (HPTU-66CTA 1) (UEF 3.45)
- A. O. Smith Heat Pump 65-Gallon (HPTU-66DR 1) (UEF 3.45)
- A. O. Smith Heat Pump 65-Gallon (HPTU-66N 1) (UEF 3.45)
- American Heat Pump 65-Gallon (HPHE10266H045DVCTA-1) (UEF 3.45)
- American Heat Pump 65-Gallon (HPHE10266H045DVDR 1) (UEF 3.45)
Frequently asked questions
Is the Cala Systems, Inc RDH6524M1 65-Gallon ENERGY STAR certified?
Yes, the Cala Systems, Inc RDH6524M1 65-Gallon holds a current ENERGY STAR certification for water heating efficiency (UEF 3.61).
What electrical circuit does the Cala Systems, Inc RDH6524M1 65-Gallon need?
The Cala Systems, Inc RDH6524M1 65-Gallon runs on a 240 V circuit drawing up to 30 A; per the NEC 125% continuous-load rule plan for at least a 40 A breaker (check the installation manual for the required circuit).
Is the Cala Systems, Inc RDH6524M1 65-Gallon a smart water heater?
No, the Cala Systems, Inc RDH6524M1 65-Gallon is not connected-capable — it has no app connectivity or demand-response support.
Sources
- data.energystar.gov (retrieved 2026-07-17)