Two leading U.S. HPWH families, compared with current sources
Rheem ProTerra vs. A. O. Smith Voltex MAX
Start with the differences that can change the purchase: hot-water delivery, electrical requirements, sound, room and clearance needs, smart controls, buying channel, and the exact model suffix.
Quick answer
Neither brand wins every installation
A. O. Smith
Compare Voltex MAX first when…
- the exact-page 45 dBA sound statement matters for the planned location;
- iCOMM app alerts and the 40-, 50-, 66-, or 80-gallon family fit the shortlist;
- a plumbing distributor or installer purchase is acceptable.
Rheem
Compare ProTerra first when…
- LeakGuard, automatic shutoff, and EcoNet controls are priorities;
- the 40-, 50-, 65-, or 80-gallon family fits the shortlist;
- easy access to related consumer-channel Rheem models matters.
Use this as a shortlist, not installation approval. The representative products below are 240V models. Both manufacturers also offer separate 120V products, but their exact model numbers and hot-water delivery must be evaluated separately.
A. O. Smith
HPTA-50 210
A premium 240V integrated heat-pump water heater with a 46-gallon ENERGY STAR-listed storage volume, smart connectivity, leak protection features, and 40-, 50-, 66-, and 80-gallon nominal family choices. Separate 120V HPTV models exist, but they are different products and should not be confused with this 240V HPTA-50.
A connected premium option with a 45 dBA manufacturer statement, sold mainly through plumbing distributors. The four-size family is flexible, but exact retail pricing and installer access vary by market.
See the complete A. O. Smith guide
Open the official manufacturer page for A. O. Smith HPTA-50 210 (opens in a new tab)
Rheem
PROPH40 T2 RH375-SO
A 240V Professional Prestige ProTerra with LeakGuard, automatic shutoff, EcoNet Wi-Fi, and 40-, 50-, 65-, and 80-gallon family variants. Separate Rheem 120V plug-in models exist, but the pictured professional 40-gallon model is a 240V product.
A widely listed product family in Home Depot's consumer channel, with a large review pool and four common sizes. Its published 49 dBA family figure makes installation location near bedrooms or living space worth careful review.
Open the official manufacturer page for Rheem PROPH40 T2 RH375-SO (opens in a new tab)
Side-by-side facts
What shoppers should compare first
| Decision | A. O. Smith HPTA-50 210 | Rheem PROPH40 T2 RH375-SO |
|---|---|---|
| Power | 208–240V; 4,500W maximum; 23.6A listed by the manufacturer Verify power for A. O. Smith HPTA-50 210 (opens in a new tab) | 240V, 30A class with 4,500W elements in the reviewed manufacturer literature Verify power for Rheem PROPH40 T2 RH375-SO (opens in a new tab) |
| Hot-water delivery | 46-gallon rated storage and 65-gallon first-hour rating Verify hot-water delivery for A. O. Smith HPTA-50 210 (opens in a new tab) | A retained ENERGY STAR listing reported 36-gallon storage and a 60-gallon first-hour rating; the current catalog has no exact match for this model Verify hot-water delivery for Rheem PROPH40 T2 RH375-SO (opens in a new tab) |
| Efficiency | 3.68 UEF; 883 kWh/year in the current ENERGY STAR record Verify efficiency for A. O. Smith HPTA-50 210 (opens in a new tab) | A retained ENERGY STAR listing reported 3.83 UEF and 859 kWh/year; current exact certification data is N/A for this model Verify efficiency for Rheem PROPH40 T2 RH375-SO (opens in a new tab) |
| Manufacturer sound statement | Manufacturer states 45 dBA operation for this HPTA-50 page. Verify sound source for A. O. Smith HPTA-50 210 (opens in a new tab) | Reviewed Rheem literature lists 49 dBA for the ProTerra family represented here. Verify sound source for Rheem PROPH40 T2 RH375-SO (opens in a new tab) |
| Smart controls | Built-in iCOMM smart connectivity supports app alerts and notifications. ENERGY STAR separately lists CTA-2045 demand-response connectivity. Verify smart-control source for A. O. Smith HPTA-50 210 (opens in a new tab) | Built-in EcoNet Wi-Fi supports temperature adjustment, energy-use tracking, and vacation mode from a mobile device. Verify smart-control source for Rheem PROPH40 T2 RH375-SO (opens in a new tab) |
| Written warranty summary | Manufacturer page states a 10-year limited tank and parts warranty. Coverage conditions, labor, registration, installation, exclusions, and proof requirements remain controlled by the written warranty. Verify warranty source for A. O. Smith HPTA-50 210 (opens in a new tab) | Rheem states a 10-year limited tank and parts warranty for this exact Professional Prestige model. Written terms control labor, registration, installation, and exclusions. Verify warranty source for Rheem PROPH40 T2 RH375-SO (opens in a new tab) |
Capacity choices
Match the exact size and voltage family
A. O. Smith family choices
Voltex MAX HPTA
HPTA-40, HPTA-50, HPTA-66, and HPTA-80 nominal-gallon models; the pictured HPTA-50 has 46 gallons of ENERGY STAR-listed storage.
Separate 120V line
HPTV-50, HPTV-66, and HPTV-80 are distinct plug-in models intended for different electrical and hot-water delivery constraints.
Rheem family choices
Professional Prestige with LeakGuard
PROPH40, PROPH50, PROPH65, and PROPH80 RH375-SO variants cover 40–80 nominal gallons.
Separate 120V products
Rheem Performance Platinum 120V plug-in models use different XE model numbers and delivery characteristics.
Installation reality
Measure before buying either one
A. O. Smith HPTA-50 210
- Tank dimensions
- 66 in high × 22 in diameter
- Room and airflow
- 450 ft³ unvented; 84 ft³ with specified air exchange
- Clearances and access
- Keep the filter, intake, exhaust, controls, condensate, and service panels accessible; do not use a generic clearance from a sibling model as approval.
Measure the doorway, ceiling, condensate route, drain pan, and service working area before ordering.
Open installation source for A. O. Smith HPTA-50 210 (opens in a new tab)
Official product documents
Rheem PROPH40 T2 RH375-SO
- Tank dimensions
- 40-gallon model: 62-5/16 in high × 20-1/4 in diameter; larger tanks are wider and taller
- Room and airflow
- 700 ft³ unducted; smaller/any-size rooms need the specified ventilation or ducting
- Clearances and access
- Preserve at least 12 in above for air/filter service and follow the exact manual's louver, door-gap, intake, exhaust, and front-service diagrams.
Professional PROPH and Home Depot XE models are related but not interchangeable exact model numbers.
Open installation source for Rheem PROPH40 T2 RH375-SO (opens in a new tab)
Official product documents
Current buying paths
Prices are model-specific snapshots—not installed quotes
A. O. Smith
Review evidence: The manufacturer page displayed 4.4 out of 5 without a stable count. A score without a sample size cannot establish broad satisfaction or reliability.
Verify the review-evidence scope for A. O. Smith HPTA-50 210 (opens in a new tab)
Lowe's
HPA10-40H45DV
$2,098.00
Same-brand, same-capacity Signature 900 retail counterpart to the HPTA-40 guide row; not the exact HPTA model. Lowe's displayed delivery inventory; destination availability can vary.
Check this direct, non-affiliate listing for HPA10-40H45DV (opens in a new tab)
Observed 2026-09-04; refresh before 2026-09-05.
Lowe's
HPSN10-50H45DV
$1,550.00
Same-brand, same-capacity Signature 900 retail counterpart to the HPTA-50 guide row; not the exact HPTA model. Lowe's displayed $1,550, delivery inventory, and Add to Cart; destination availability can vary.
Check this direct, non-affiliate listing for HPSN10-50H45DV (opens in a new tab)
Observed 2026-09-04; refresh before 2026-09-05.
Lowe's
HPS10-66H45DV
$2,598.00
Same-brand, same-capacity Signature 900 retail counterpart to the HPTA-66 guide row; not the exact HPTA model. Lowe's displayed delivery inventory; destination availability can vary.
Check this direct, non-affiliate listing for HPS10-66H45DV (opens in a new tab)
Observed 2026-09-04; refresh before 2026-09-05.
Lowe's
HPS10-80H45DV
$2,199.00
Same-brand, same-capacity Signature 900 retail counterpart to the HPTA-80 guide row; not the exact HPTA model. Lowe's displayed delivery inventory; destination availability can vary.
Check this direct, non-affiliate listing for HPS10-80H45DV (opens in a new tab)
Observed 2026-09-04; refresh before 2026-09-05.
Rheem
Review evidence: The retailer shows roughly four out of five across more than one thousand entries. Praise often covers energy savings, hot-water delivery, and controls; recurring complaints include fan noise, connectivity, service, and early component failures.
Verify the review-evidence scope for Rheem PROPH40 T2 RH375-SO (opens in a new tab)
Home Depot
XE40T10H45U1
$1,529.00
Current public single-unit advertised price for the same-brand 40-gallon Performance Platinum retail counterpart. This is not the selected PROPH professional-channel suffix; verify model, local price, stock, and checkout total.
Check this direct, non-affiliate listing for XE40T10H45U1 (opens in a new tab)
Observed 2026-09-04; refresh before 2026-09-05.
Home Depot
XE50T10H45U1
$1,699.00
Current public single-unit advertised price for the same-brand 50-gallon Performance Platinum retail counterpart. This is not the selected PROPH professional-channel suffix; verify model, local price, stock, and checkout total.
Check this direct, non-affiliate listing for XE50T10H45U1 (opens in a new tab)
Observed 2026-09-04; refresh before 2026-09-05.
Home Depot
XE65T10H45U1
$2,059.00
Current public single-unit advertised price for the same-brand 65-gallon Performance Platinum retail counterpart. This is not the selected PROPH professional-channel suffix; verify model, local price, stock, and checkout total.
Check this direct, non-affiliate listing for XE65T10H45U1 (opens in a new tab)
Observed 2026-09-04; refresh before 2026-09-05.
Home Depot
XE80T10H45U1
$2,235.29
Current public single-unit advertised price for the same-brand 80-gallon Performance Platinum retail counterpart. This is not the selected PROPH professional-channel suffix; verify model, local price, stock, and checkout total.
Check this direct, non-affiliate listing for XE80T10H45U1 (opens in a new tab)
Observed 2026-09-04; refresh before 2026-09-05.
Seller links are direct and non-affiliate. No commission, retailer partnership, guaranteed stock, delivered cost, or installed price is claimed.
Next step
Compare exact models and sizes
Take these brand-level differences into the source-backed product comparison, then confirm the exact size, price, and evidence that matter to you.
Comparison reviewed 2026-08-26. Refresh required before 2026-08-28. This comparison describes two reviewed representative 240V models and their current manufacturer evidence. The current ENERGY STAR catalog has no exact match for the represented Rheem model, so its certification binding is N/A. This is not a universal winner, household-fit decision, installed-price quote, inventory promise, or affiliate recommendation.