A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45C 1-+AXST-50LBCTTP 1)
A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45C 1-+AXST-50LBCTTP 1) is a heat pump (hybrid electric) water heater from A. O. Smith with a 48 gallon rated tank and a 72 gallon first-hour rating at a 3.55 UEF — 915 kWh/yr certified use, 33 in tall.
Also sold as the A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45 1-+AXST-50LBTTP 1). This model is the same certified
hardware as the A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45 1-+AXST-50LBTTP 1), published under a
different brand — full details, comparisons, and pricing live on that page. The
certified figures below are identical.
Efficiency
Uniform Energy Factor (UEF)
3.55
Annual electricity use
915 kWh/yr
Recovery efficiency
428 %
General
Fuel
Electric
Capacity
First-hour rating
72 gal
Rated storage volume
48 gal
Draw pattern
Medium
Heat pump
Heat pump type
Split System HPWH
Refrigerant (GWP)
R-744 (CO₂) (GWP:1 | Lower GWP)
Compressor low-temp cutoff
1 °F
Installation
Input voltage
240
Max current draw
20.2 A
Smart features
Smart / connected capable
Yes
Dimensions
Height
33 in
Diameter
22.5 in
Certification
ENERGY STAR certified
Yes
Who is the A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45C 1-+AXST-50LBCTTP 1) for?
Its 72 gallon first-hour rating suits a
household of 3–4 people under DOE sizing guidance.
Estimated running cost: about $156/year at the national
average electricity rate (915 kWh/yr certified use).
Needs a 240 V circuit; at 20.2 A max draw plan for a 30 A breaker (NEC 125% continuous-load rule).
The heat pump compressor operates down to 1 °F ambient — below that, backup
elements take over.
Is the A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45C 1-+AXST-50LBCTTP 1) ENERGY STAR certified?
Yes, the A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45C 1-+AXST-50LBCTTP 1) holds a current ENERGY STAR certification for water heating efficiency (UEF 3.55).
How much does the A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45C 1-+AXST-50LBCTTP 1) cost to run per year?
About $156 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 A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45C 1-+AXST-50LBCTTP 1) need?
The A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45C 1-+AXST-50LBCTTP 1) runs on a 240 V circuit drawing up to 20.2 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 A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45C 1-+AXST-50LBCTTP 1) a smart water heater?
Yes, the A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45C 1-+AXST-50LBCTTP 1) is connected-capable, with app control and eligibility for most utility demand-response programs.
