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A. O. Smith FPTU-50

Ranked #46 of 47 in Best 240-Volt Heat Pump Water Heaters (2026). Here is every spec we scored, where it came from, and how it compares.

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AO

#46

A. O. Smith FPTU-50

Best for: Official UEF 3.35, first-hour rating 66 gallons, 46 gallons certified storage

1.5/10

What we like

Official certified ratings are published for every scored criterion

Watch out for

Lowest official uniform energy factor in this comparison (3.35)
ENERGY STAR does not list this model as connected-capable

Score breakdown

Uniform energy factor 36%

First-hour rating 28%

Certified storage volume 18%

Connected capable 18%

Uniform energy factor	3.35
First-hour rating	66 gallons
Certified storage volume	46 gallons
Connected capable	No
Uniform energy factor (ENERGY STAR UEF)	3.35
First-hour rating (ENERGY STAR)	66 gallons
Certified storage volume (ENERGY STAR)	46 gallons
Annual energy use (ENERGY STAR)	970 kWh/year
Annual energy use per gallon (computed)	21.1 kWh/year per gallon, computed as certified annual energy use ÷ certified storage volume
Connected capable (ENERGY STAR)	No
Heat pump type (ENERGY STAR)	240 Volt Integrated HPWH
Input voltage (ENERGY STAR)	240 V
Maximum current (ENERGY STAR)	22.0 A
Lower compressor cut-off temperature (ENERGY STAR)	45.0 °F
Draw pattern (ENERGY STAR)	Medium-Usage
Recovery efficiency (ENERGY STAR)	407%
Sound pressure level (ENERGY STAR)	Not listed
Tank height (ENERGY STAR)	63 in
Tank diameter (ENERGY STAR)	15 in
Refrigerant (ENERGY STAR)	R-134a
Certified model number	FPTU-50 1**
Official brand name on the ENERGY STAR record	A. O. Smith
Price	Check price

Check price at Amazon

Specs sources:

A. O. Smith FPTU-50 head-to-head

Head-to-headA. O. Smith HPTS-50 vs A. O. Smith FPTU-50

How it compares

Open the full comparison table

GE Profile PH80S10BNY01

#1 · Official UEF 4.5, first-hour rating 101 gallons, 80 gallons certified storage, ENERGY STAR connected-capable

A. O. Smith CAHP-80

#2 · Official UEF 3.88, first-hour rating 95 gallons, 81 gallons certified storage, ENERGY STAR connected-capable

GE Profile PH65S10BNY01

#3 · Official UEF 4.3, first-hour rating 86 gallons, 65 gallons certified storage, ENERGY STAR connected-capable

Ariston ARIHPWH-80-T

#4 · Official UEF 4.1, first-hour rating 88 gallons, 74 gallons certified storage, ENERGY STAR connected-capable

Lennox WHHP080T45MD240S

#5 · Official UEF 4.1, first-hour rating 88 gallons, 74 gallons certified storage, ENERGY STAR connected-capable

ACIQ ACIQ-80G-HP-WH

#6 · Official UEF 4, first-hour rating 91 gallons, 74 gallons certified storage, ENERGY STAR connected-capable

Bosch TR7000T - 80US

#7 · Official UEF 4, first-hour rating 91 gallons, 74 gallons certified storage, ENERGY STAR connected-capable

Midea MAHW-80VN3B

#8 · Official UEF 4, first-hour rating 91 gallons, 75 gallons certified storage, ENERGY STAR connected-capable

Rinnai REHP80W

#9 · Official UEF 4, first-hour rating 91 gallons, 75 gallons certified storage, ENERGY STAR connected-capable

American Standard ASHPWH-80

#10 · Official UEF 4.01, first-hour rating 87 gallons, 73 gallons certified storage, ENERGY STAR connected-capable

GE Profile PH50S10BNY01

#11 · Official UEF 4.5, first-hour rating 75 gallons, 50 gallons certified storage, ENERGY STAR connected-capable

GE Profile PH50S10BPY01

#12 · Official UEF 4.3, first-hour rating 77 gallons, 50 gallons certified storage, ENERGY STAR connected-capable

A. O. Smith CAHP-66

#13 · Official UEF 3.84, first-hour rating 83 gallons, 68 gallons certified storage, ENERGY STAR connected-capable

Lennox WHHP065T45MD240S

#14 · Official UEF 4.05, first-hour rating 77 gallons, 61 gallons certified storage, ENERGY STAR connected-capable

Midea MAHW-65VN3B

#15 · Official UEF 4, first-hour rating 80 gallons, 61 gallons certified storage, ENERGY STAR connected-capable

Rinnai REHP65W

#16 · Official UEF 4, first-hour rating 80 gallons, 61 gallons certified storage, ENERGY STAR connected-capable

Bosch TR7000T-65US

#17 · Official UEF 3.9, first-hour rating 80 gallons, 60 gallons certified storage, ENERGY STAR connected-capable

Senville SENWH-HP65US

#18 · Official UEF 3.9, first-hour rating 80 gallons, 60 gallons certified storage, ENERGY STAR connected-capable

Rheem PRO H80 T2 RH310UM

#19 · Official UEF 3.5, first-hour rating 87 gallons, 72 gallons certified storage, ENERGY STAR connected-capable

Noritz NHP-80-240

#20 · Official UEF 4.24, first-hour rating 82 gallons, 71 gallons certified storage

Bradford White RE2HP80-1NCTT

#21 · Official UEF 4, first-hour rating 88 gallons, 75 gallons certified storage

LG APHWC801M

#22 · Official UEF 3.9, first-hour rating 94 gallons, 72 gallons certified storage

Bradford White RE2HP65-1NCTT

#23 · Official UEF 4.2, first-hour rating 82 gallons, 65 gallons certified storage

GE Profile PH40S10BPY01

#24 · Official UEF 4.2, first-hour rating 64 gallons, 40 gallons certified storage, ENERGY STAR connected-capable

LG APHWC502M

#25 · Official UEF 4.2, first-hour rating 81 gallons, 53 gallons certified storage

Ariston ARIHPWH-50-T

#26 · Official UEF 3.83, first-hour rating 69 gallons, 45 gallons certified storage, ENERGY STAR connected-capable

Lennox WHHP050T45MD240S

#27 · Official UEF 3.83, first-hour rating 69 gallons, 45 gallons certified storage, ENERGY STAR connected-capable

Midea MAHW-50VN3B

#28 · Official UEF 3.75, first-hour rating 71 gallons, 46 gallons certified storage, ENERGY STAR connected-capable

Rheem PRO H65 T2 RH310UM

#29 · Official UEF 3.5, first-hour rating 75 gallons, 59 gallons certified storage, ENERGY STAR connected-capable

Rinnai REHP50W

#30 · Official UEF 3.75, first-hour rating 71 gallons, 46 gallons certified storage, ENERGY STAR connected-capable

ACIQ ACIQ-50G-HP-WH

#31 · Official UEF 3.75, first-hour rating 69 gallons, 47 gallons certified storage, ENERGY STAR connected-capable

Bosch TR7000T - 50US

#32 · Official UEF 3.75, first-hour rating 69 gallons, 47 gallons certified storage, ENERGY STAR connected-capable

Senville SENWH-HP50US

#33 · Official UEF 3.75, first-hour rating 69 gallons, 47 gallons certified storage, ENERGY STAR connected-capable

A. O. Smith HPTS-50

#34 · Official UEF 3.8, first-hour rating 65 gallons, 46 gallons certified storage, ENERGY STAR connected-capable

American Standard ASHPWH-50

#35 · Official UEF 3.75, first-hour rating 68 gallons, 45 gallons certified storage, ENERGY STAR connected-capable

GREE GRS-3.0Pd/TD50GANhA-D

#36 · Official UEF 4.02, first-hour rating 80 gallons, 55 gallons certified storage

A. O. Smith CAHP-50

#37 · Official UEF 3.68, first-hour rating 65 gallons, 46 gallons certified storage, ENERGY STAR connected-capable

State CSHP-50

#38 · Official UEF 3.68, first-hour rating 65 gallons, 46 gallons certified storage, ENERGY STAR connected-capable

Vaughn ME80HPT

#39 · Official UEF 3.48, first-hour rating 86 gallons, 74 gallons certified storage

Rheem PRO H50 T2 RH310UM

#40 · Official UEF 3.5, first-hour rating 67 gallons, 45 gallons certified storage, ENERGY STAR connected-capable

A. O. Smith CAHP-40

#41 · Official UEF 3.6, first-hour rating 55 gallons, 36 gallons certified storage, ENERGY STAR connected-capable

Bradford White RE2HP50-1NCTT

#42 · Official UEF 3.89, first-hour rating 65 gallons, 45 gallons certified storage

Noritz NHP-50-240

#43 · Official UEF 3.85, first-hour rating 68 gallons, 45 gallons certified storage

Rheem PRO H40 T2 RH310UM

#44 · Official UEF 3.5, first-hour rating 60 gallons, 36 gallons certified storage, ENERGY STAR connected-capable

Rheem PRO H50 T2 RH310BM

#45 · Official UEF 3.5, first-hour rating 67 gallons, 45 gallons certified storage

Vaughn ME50HPT

#47 · Official UEF 3.46, first-hour rating 58 gallons, 47 gallons certified storage