← Back to the manufacturer comparison

Ariston ARIHPWH-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 · Ariston

Ariston NUOS ARIHPWH-50 buying guide

A 240V integrated heat-pump water heater in Ariston's new U.S. NUOS line. The manufacturer documents Wi-Fi control, leak detection, multiple operating modes, and 40-, 50-, 65-, and 80-gallon family sizes. The 50-gallon exact model has a current literal ENERGY STAR match.

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.

All rows are current U.S. NUOS Multi-Fit 208–240V models. Dimensions are the product height and jacket diameter.

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 galARIHPWH-40-TShortest NUOS model; manufacturer sheet lists 190 lb shipping weight. See current seller price PACE Supply Open direct listing for ARIHPWH-40-T (opens in a new tab) The exact alternate model is listed, but public pricing requires a seller login; no price is substituted. 56 1/2 in H × 22 3/4 in diameter 700 ft³; smaller w/ ventilation/ducting
Requirement detailsWithout ducts, a room of at least 700 ft³ needs no added ventilation. Below 700 ft³, the official manual requires a fully louvered door or top-and-bottom louvers; its small-closet arrangement requires an 18 in² / 0.75-in under-door opening plus an exhaust-height louver and exhaust within 12 in of the door. With only inlet or outlet ducting, an 18 in² / 0.75-in under-door opening is required. With both inlet and outlet ducted, the manual permits any room size with no added ventilation. No lower universal numeric volume is stated. Installation source for ARIHPWH-40-T (opens in a new tab).
 45.0 dBA at 6 ft
Sound evidencethird-party certified test procedure stated by exact-model-set specification This exact-model-set document is hosted by a major plumbing distributor, not on the current Ariston domain. The Ariston-domain non-T Side-Connect document reports 49.1 dBA for different model identifiers and is not substituted for these -T choices. Sound source for ARIHPWH-40-T (opens in a new tab).
 37 gal 65 gal 3.55 208–240V
30A		 N/A
50 galARIHPWH-50-TRepresentative size reviewed on this page; 238 lb shipping weight. $2,219.00 WebstaurantStore Check size-matched listing for ARIHPWH-50-T (opens in a new tab) Different retail model
Why this price?Selected model: ARIHPWH-50-T. Listing: ARIHPWH-50. Verify the exact suffix before purchase. Exact 50-gallon listing displayed $2,219 and an Add to Cart control; the item usually ships in 1–2 weeks from the manufacturer. Confirm destination and lead time.Observed 2026-09-04; verify current price and availability.
 64 1/4 in H × 22 3/4 in diameter 700 ft³; smaller w/ ventilation/ducting
Requirement detailsWithout ducts, a room of at least 700 ft³ needs no added ventilation. Below 700 ft³, the official manual requires a fully louvered door or top-and-bottom louvers; its small-closet arrangement requires an 18 in² / 0.75-in under-door opening plus an exhaust-height louver and exhaust within 12 in of the door. With only inlet or outlet ducting, an 18 in² / 0.75-in under-door opening is required. With both inlet and outlet ducted, the manual permits any room size with no added ventilation. No lower universal numeric volume is stated. Installation source for ARIHPWH-50-T (opens in a new tab).
 45.0 dBA at 6 ft
Sound evidencethird-party certified test procedure stated by exact-model-set specification This exact-model-set document is hosted by a major plumbing distributor, not on the current Ariston domain. The Ariston-domain non-T Side-Connect document reports 49.1 dBA for different model identifiers and is not substituted for these -T choices. Sound source for ARIHPWH-50-T (opens in a new tab).
 45 gal 68 gal 3.83 208–240V
30A		 N/A
65 galARIHPWH-65-TWider 65-gallon chassis; 271 lb shipping weight. $2,819.00 WebstaurantStore Check size-matched listing for ARIHPWH-65-T (opens in a new tab) Different retail model
Why this price?Selected model: ARIHPWH-65-T. Listing: ARIHPWH-65. Verify the exact suffix before purchase. Exact 65-gallon listing displayed $2,819 and an Add to Cart control; the item usually ships in 1–2 weeks from the manufacturer. Confirm destination and lead time.Observed 2026-09-04; verify current price and availability.
 69 1/8 in H × 24 1/2 in diameter 700 ft³; smaller w/ ventilation/ducting
Requirement detailsWithout ducts, a room of at least 700 ft³ needs no added ventilation. Below 700 ft³, the official manual requires a fully louvered door or top-and-bottom louvers; its small-closet arrangement requires an 18 in² / 0.75-in under-door opening plus an exhaust-height louver and exhaust within 12 in of the door. With only inlet or outlet ducting, an 18 in² / 0.75-in under-door opening is required. With both inlet and outlet ducted, the manual permits any room size with no added ventilation. No lower universal numeric volume is stated. Installation source for ARIHPWH-65-T (opens in a new tab).
 45.0 dBA at 6 ft
Sound evidencethird-party certified test procedure stated by exact-model-set specification This exact-model-set document is hosted by a major plumbing distributor, not on the current Ariston domain. The Ariston-domain non-T Side-Connect document reports 49.1 dBA for different model identifiers and is not substituted for these -T choices. Sound source for ARIHPWH-65-T (opens in a new tab).
 61 gal 77 gal 4.05 208–240V
30A		 N/A
80 galARIHPWH-80-TTallest NUOS model and highest first-hour rating; 337 lb shipping weight. $3,429.00 WebstaurantStore Check size-matched listing for ARIHPWH-80-T (opens in a new tab) Different retail model
Why this price?Selected model: ARIHPWH-80-T. Listing: ARIHPWH-80. Verify the exact suffix before purchase. Exact 80-gallon listing displayed $3,429 and an Add to Cart control; the item usually ships in 1–2 weeks from the manufacturer. Confirm destination and lead time.Observed 2026-09-04; verify current price and availability.
 78 3/4 in H × 24 1/2 in diameter 700 ft³; smaller w/ ventilation/ducting
Requirement detailsWithout ducts, a room of at least 700 ft³ needs no added ventilation. Below 700 ft³, the official manual requires a fully louvered door or top-and-bottom louvers; its small-closet arrangement requires an 18 in² / 0.75-in under-door opening plus an exhaust-height louver and exhaust within 12 in of the door. With only inlet or outlet ducting, an 18 in² / 0.75-in under-door opening is required. With both inlet and outlet ducted, the manual permits any room size with no added ventilation. No lower universal numeric volume is stated. Installation source for ARIHPWH-80-T (opens in a new tab).
 45.0 dBA at 6 ft
Sound evidencethird-party certified test procedure stated by exact-model-set specification This exact-model-set document is hosted by a major plumbing distributor, not on the current Ariston domain. The Ariston-domain non-T Side-Connect document reports 49.1 dBA for different model identifiers and is not substituted for these -T choices. Sound source for ARIHPWH-80-T (opens in a new tab).
 74 gal 88 gal 4.1 208–240V
30A		 N/A

Check the official size specification from Ariston NUOS Multi-Fit 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
Ariston states a 10-year limited warranty on tank and parts for the U.S. NUOS Side-Connect family. Read the linked warranty document for eligibility, exclusions, labor, and claim conditions.Official warranty terms for Ariston ARIHPWH-50 (opens in a new tab)
Smart-home control
Embedded Wi-Fi and the Ariston NET app support remote control, scheduling, consumption monitoring, notifications, and diagnostics.Official controls source for Ariston ARIHPWH-50 (opens in a new tab)

Pros

  • Wi-Fi/app controls, leak sensing, and four common nominal capacities are documented on the U.S. manufacturer page.
  • Three family capacities have visible online equipment prices in the reviewed retailer listing.

Cons

  • The 50-gallon model's 68-gallon first-hour rating trails the verified GE Profile 50 at 75 gallons and Rinnai 50 at 73 gallons.
  • Its 700 ft³ unvented-room requirement needs more open air than A. O. Smith's verified 450 ft³ alternative, which can matter in smaller utility rooms.

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

The U.S. line is too new for a substantial exact-model owner population. Three clearly scoped sources are shown instead: a professional U.S. walkthrough, an officially related counterpart discussion, and an international NUOS owner forum.

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

  • Professional coverage highlights flexible side connections and connected controls
  • Related-family owners discuss efficient heat-pump operation

Owners flag

  • No substantial exact U.S. owner sample is available
  • Counterpart and international reports are context, not exact-model reliability evidence

Mechanical Hub professional walkthrough

ARIHPWH-50
Professional evaluations: 1 evaluation

Independent professional evaluation

The professional walkthrough highlights side connections, integrated controls, app functions, and service access. It provides useful product context but no long-term ownership evidence.

Related listing with explicit scope: This trade-publication video covers the new U.S. NUOS side-connect family. It is a product walkthrough, not an owner reliability sample.

Owner reports: 3 owner reports

Identifiable owner reports

Discussion summary: Early owners discuss quiet operation and ordinary hot-water performance, while also noting the new product line has little long-term history. The sample is small and not exact-model evidence.

Officially documented retail counterpart: The discussion concerns American Standard-branded units documented as Ariston-built counterparts. It is related-product context and is not attributed to the exact ARIHPWH-50-T.

Model relationship source for American Standard HPWH counterpart discussion (opens in a new tab)

Akkudoktor NUOS owner forum

Ariston NUOS family
Owner reports: 8 owner reports

Identifiable owner reports

Owners discuss efficiency, operating modes, sound, and setup tradeoffs across related NUOS units. It supplies family-level ownership questions, not a U.S. exact-model score or reliability conclusion.

Related listing with explicit scope: This German-language owner discussion concerns related European NUOS products, not the U.S. side-connect model. Climate, controls, tank layout, and service context can differ.

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.

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.