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A. O. Smith HPTA-50 heat pump water heater Official manufacturer product image used for editorial identification; no endorsement implied. Official image source (opens in a new tab).

Independent shopper guide · A. O. Smith

A. O. Smith Voltex MAX HPTA-50 buying guide

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.

Check current prices

Shopper guide · about 8 minutes.
Editorial synthesis awaiting refresh. Each specification, price, and review source below remains governed by its own displayed source date and may still be current.

Buying guide details

Same product line, different fit

Compare size, price, room air and noise

Use first-hour rating—not tank size alone—to compare hot-water delivery. Prices are exact-size public observations before tax, shipping, installation and rebates, and can change at any time. Room-air and sound figures keep their exact source scope and qualifications.

These rows compare the 208–240V HPTA family. The separate 120V HPTV line is not interchangeable with these models.

Choose what to compareShowing the numbers shoppers use most. Every available specification remains one click away.
Exact-size advertised price, dimensions, minimum room air, noise, and performance for each offered size
Size and modelLowest advertised priceProduct dimensionsMinimum room airNoise level (dBA)Rated storageFirst-hour ratingUEFPower / circuitEmpty weight
40 galHPTA-40Smallest HPTA footprint and delivery. $2,098.00 Lowe's Check size-matched listing for HPTA-40 (opens in a new tab) Different retail model
Why this price?Selected model: HPTA-40. Listing: HPA10-40H45DV. Verify the exact suffix before purchase. 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.Observed 2026-09-04; verify current price and availability.
 64 3/4 in H × 20 in diameter 450 ft³; 84 ft³ w/ air exchange
Requirement detailsThe current HPTA Series 210 manual requires at least 450 ft³ without added air exchange. Enclosures from 84–449 ft³ are permitted only with one of the manual's transfer-air arrangements: fully louvered door; upper and lower wall grilles; or upper grille plus a 3/4-in door undercut / at least 18 in² net free opening. Each wall grille must be at least 22 × 6 in or 130 in² net free area. Factory duct adapters are also supported; follow the duct section rather than treating 84 ft³ as an unconditional minimum. Installation source for HPTA-40 (opens in a new tab).
 45 dBA
Sound evidencemanufacturer operation statement; measurement distance/mode not stated Sound source for HPTA-40 (opens in a new tab).
 36 gal 55 gal 3.6 208–240V
30A		 191 lb
50 galHPTA-50Representative size reviewed on this page. $1,550.00 Lowe's Check size-matched listing for HPTA-50 (opens in a new tab) Different retail model
Why this price?Selected model: HPTA-50. Listing: HPSN10-50H45DV. Verify the exact suffix before purchase. 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.Observed 2026-09-04; verify current price and availability.
 63 in H × 22 in diameter 450 ft³; 84 ft³ w/ air exchange
Requirement detailsThe current HPTA Series 210 manual requires at least 450 ft³ without added air exchange. Enclosures from 84–449 ft³ are permitted only with one of the manual's transfer-air arrangements: fully louvered door; upper and lower wall grilles; or upper grille plus a 3/4-in door undercut / at least 18 in² net free opening. Each wall grille must be at least 22 × 6 in or 130 in² net free area. Factory duct adapters are also supported; follow the duct section rather than treating 84 ft³ as an unconditional minimum. Installation source for HPTA-50 (opens in a new tab).
 45 dBA
Sound evidencemanufacturer operation statement; measurement distance/mode not stated Sound source for HPTA-50 (opens in a new tab).
 46 gal 65 gal 3.68 208–240V
30A		 196 lb
66 galHPTA-66Shorter but substantially wider and heavier than the 50. $2,598.00 Lowe's Check size-matched listing for HPTA-66 (opens in a new tab) Different retail model
Why this price?Selected model: HPTA-66. Listing: HPS10-66H45DV. Verify the exact suffix before purchase. 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.Observed 2026-09-04; verify current price and availability.
 61 1/2 in H × 26 1/2 in diameter 450 ft³; 84 ft³ w/ air exchange
Requirement detailsThe current HPTA Series 210 manual requires at least 450 ft³ without added air exchange. Enclosures from 84–449 ft³ are permitted only with one of the manual's transfer-air arrangements: fully louvered door; upper and lower wall grilles; or upper grille plus a 3/4-in door undercut / at least 18 in² net free opening. Each wall grille must be at least 22 × 6 in or 130 in² net free area. Factory duct adapters are also supported; follow the duct section rather than treating 84 ft³ as an unconditional minimum. Installation source for HPTA-66 (opens in a new tab).
 45 dBA
Sound evidencemanufacturer operation statement; measurement distance/mode not stated Sound source for HPTA-66 (opens in a new tab).
 68 gal 83 gal 3.84 208–240V
30A		 284 lb
80 galHPTA-80Highest HPTA storage and first-hour delivery. $2,199.00 Lowe's Check size-matched listing for HPTA-80 (opens in a new tab) Different retail model
Why this price?Selected model: HPTA-80. Listing: HPS10-80H45DV. Verify the exact suffix before purchase. 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.Observed 2026-09-04; verify current price and availability.
 69 in H × 26 1/2 in diameter 450 ft³; 84 ft³ w/ air exchange
Requirement detailsThe current HPTA Series 210 manual requires at least 450 ft³ without added air exchange. Enclosures from 84–449 ft³ are permitted only with one of the manual's transfer-air arrangements: fully louvered door; upper and lower wall grilles; or upper grille plus a 3/4-in door undercut / at least 18 in² net free opening. Each wall grille must be at least 22 × 6 in or 130 in² net free area. Factory duct adapters are also supported; follow the duct section rather than treating 84 ft³ as an unconditional minimum. Installation source for HPTA-80 (opens in a new tab).
 45 dBA
Sound evidencemanufacturer operation statement; measurement distance/mode not stated Sound source for HPTA-80 (opens in a new tab).
 81 gal 95 gal 3.88 208–240V
30A		 302 lb

Check the official size specification from A. O. Smith Voltex MAX specification sheet (opens in a new tab). Final dimensions and requirements must be confirmed against the exact model ordered.

Ownership essentials

Warranty and connected controls

Confirm coverage terms and supported controls for the exact model before purchase.

Warranty
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.Official warranty terms for A. O. Smith HPTA-50 210 (opens in a new tab)
Smart-home control
Built-in iCOMM smart connectivity supports app alerts and notifications. ENERGY STAR separately lists CTA-2045 demand-response connectivity.Official controls source for A. O. Smith HPTA-50 210 (opens in a new tab)

Pros

  • 45 dBA manufacturer sound claim and app-connected controls are both documented for the exact page.
  • Four nominal tank sizes and separate 120V models give the manufacturer line broad sizing and electrical options.

Cons

  • At 50 gallons, the verified 65-gallon first-hour rating and 3.68 UEF trail the GE Profile 50 at 75 gallons and 4.5 UEF, and the Rinnai 50 at 73 gallons and 3.75 UEF.
  • Its 45 dBA published sound level is quieter than several 49 dBA alternatives, but not as quiet on paper as the 41 dBA GE Profile or LG's 42 dBA low-mode figure.

Reviews you can read here

What reviewers and owners report

Each card gives you our source-specific summary on this page. Ratings and counts stay separate, and related-model or professional evidence is clearly labeled.

Coverage at a glance

Three different signals are available: the exact manufacturer badge, one documented Lowe's retail-counterpart population, and an HPTA-family owner discussion. They disagree, so each remains separate.

Sources were checked independently on 2026-09-02. Onsite text is an original concise paraphrase, not a copied review body. Ratings and counts remain source-specific; related models and professional evaluations are explicitly labeled.

Owners praise

  • Some HPTA owners report low energy use and adequate hot water
  • A smaller group reports trouble-free ownership

Owners flag

  • Compressor, control, app, and breaker complaints recur in the retailer and community samples
  • Warranty replacement may still leave labor costs

A. O. Smith product page

HPTA-50 210
Rating: 4.4/5

Current rating; count unavailable

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.

Exact model: The exact HPTA-50 page exposes a rating but no stable review count. It is shown as limited listing context, not a reliability measure.

Lowe's

HPA10-50 Lowe's retail counterpart
Rating: 1.6/5

Current source aggregate · 32 source-hosted entries

The retailer sample is strongly negative. Recurring reports describe early compressor or control faults, app problems, replacement failures, and warranty-labor friction; a smaller positive group reports energy savings and adequate hot water.

Officially documented retail counterpart: A. O. Smith's service handbook maps the HPTA wholesale line to HPA10 retail counterparts. Lowe's syndicates a family population, so it is shown once and not added to sibling pages.

Model relationship source for HPA10-50 Lowe's retail counterpart (opens in a new tab)

Owner reports: 6 owner reports

Identifiable owner reports

Discussion summary: Reports are mixed: some HPTA owners describe very low operating cost and trouble-free use, while others describe app pairing, compressor, or warranty-labor problems. The self-selected thread cannot provide a failure rate.

Related listing with explicit scope: The thread includes identifiable HPTA-family owners alongside older A. O. Smith models. Only comments that name an HPTA size or clearly describe the current retail family inform this summary.

The summaries above are readable here; the verification links are optional. We paraphrase rather than republish copyrighted review bodies. Coverage is broad but cannot be literally exhaustive, and a small, incentivized, seller-hosted, family-level, professional, or community sample is not a reliability study.

Help the next homeowner

Review your exact size and model

Choose the exact capacity you own, rate it, and describe what ownership has been like. Reports stay private until a moderator approves them; approval confirms only that a report meets the publishing rules, not that its claims were independently verified.

Your rating
What worked, what did not, installation surprises, sound, recovery, controls, or service are useful. Do not include names, contact details, street addresses, order numbers, installer names, URLs, or account details.0 / 1,500 characters

The review record has no name, email, contact field, account, IP address, user agent, or browser identifier. It stores only this guide, exact size and model, rating, ownership period, report text, and moderation status. Published reports remain separate from public-source evidence.

Equipment prices, not installed quotes

Where to buy and what it costs

We check Home Depot, Lowe’s, Menards and SupplyHouse.com first. Prices exclude installation, permits, accessories, tax, shipping and rebates unless explicitly stated.

Lowe's

HPSN10-50H45DV

$1550.00

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 current seller details for HPSN10-50H45DV (opens in a new tab) Checked 2026-09-04 · refresh before 2026-09-05.

Direct, non-affiliate links. Family-variant and list prices are labeled; neither means the pictured exact model is in local stock.

Validate the product evidence

Official specifications and documents

Use these primary manufacturer documents to verify the comparison facts for the exact model.