Official manufacturer product image used for editorial identification; no endorsement implied. Official image source.

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.

Read Reddit research

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.

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.

Exact-size advertised price, dimensions, minimum room air, noise, and performance for each offered size
Size and model	Lowest current price	Product dimensions	Minimum room air	Noise level (dBA)	Rated storage	First-hour rating	UEF	Power / circuit	Empty weight
40 galARIHPWH-40-TShortest NUOS model; manufacturer sheet lists 190 lb shipping weight.	Price withheld pending our next source check PACE Supply View retailer source for ARIHPWH-40-T (opens in a new tab) Price and availability accessible only after seller login; no public numeric price was displayed. The page identifies American Standard ASWN40HPMF / MFG 4057082 and lists ARIHPWH-40-T as an alternate part number. No public amount was captured for this listing. Its source check has expired; a new verified observation is required before we can publish a price.	56 1/2 in H × 22 3/4 in diameter	700 ft³; smaller w/ ventilation/ducting Requirement details Without 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 evidence third-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.	Price withheld pending our next source check WebstaurantStore View retailer source for ARIHPWH-50-T (opens in a new tab) Exact seller model ARIHPWH-50, not an inferred -T suffix: quantity 1 and enabled Add to Cart. Usually ships from the manufacturer in 1–2 weeks, dependent on manufacturer stock; no warehouse stock quantity verified. Destination, availability, timing, freight and checkout terms can vary. The earlier amount lacks current evidence. We withhold it until we verify and publish a new eligible observation.	64 1/4 in H × 22 3/4 in diameter	700 ft³; smaller w/ ventilation/ducting Requirement details Without 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 evidence third-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.	Price withheld pending our next source check WebstaurantStore View retailer source for ARIHPWH-65-T (opens in a new tab) Exact seller model ARIHPWH-65, not an inferred -T suffix: quantity 1 and enabled Add to Cart. Usually ships from the manufacturer in 1–2 weeks, dependent on manufacturer stock; no warehouse stock quantity verified. Destination, availability, timing, freight and checkout terms can vary. The earlier amount lacks current evidence. We withhold it until we verify and publish a new eligible observation.	69 1/8 in H × 24 1/2 in diameter	700 ft³; smaller w/ ventilation/ducting Requirement details Without 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 evidence third-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.	Price withheld pending our next source check WebstaurantStore View retailer source for ARIHPWH-80-T (opens in a new tab) Exact seller model ARIHPWH-80, not an inferred -T suffix: quantity 1 and enabled Add to Cart. Usually ships from the manufacturer in 1–2 weeks, dependent on manufacturer stock; no warehouse stock quantity verified. Destination, availability, timing, freight and checkout terms can vary. The earlier amount lacks current evidence. We withhold it until we verify and publish a new eligible observation.	78 3/4 in H × 24 1/2 in diameter	700 ft³; smaller w/ ventilation/ducting Requirement details Without 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 evidence third-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.
Compare the dated offers by capacity below; a price for the 50-, 65- or 80-gallon model does not establish a price for the 40-gallon model.

Cons

For ARIHPWH-50-T, the manufacturer sheet lists 68 gallons of first-hour delivery while exact ENERGY STAR record 4437414 lists 69. The conflict is unresolved; both are below 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.

These are American Standard-branded and related-product discussions, not three exact Ariston ARIHPWH owner reviews. They help frame questions about noise, setup and installation; exact-model long-term evidence remains limited.

Promising everyday use—with a major caveat

Related-product owners report useful hot water and modest operating noise. One favorable 50-gallon account uses a second resistance tank in series, so it cannot demonstrate standalone 50-gallon delivery.

Based on discussion 1: Anyone with American Standard's HPWH? · discussion 2: Rheem vs. American Standard HPWH, 65 vs 80 gallon

Setup and vibration deserve attention

Wi-Fi setup and case vibration appear in the related-family discussion. An Ariston employee participates, and owner accounts may overlap across threads; neither is an independent additional review population.

Based on discussion 1: Anyone with American Standard's HPWH? · discussion 2: Rheem vs. American Standard HPWH, 65 vs 80 gallon

What remains unanswered

The ASHPWH-50 sourcing question is shopping research, not installed ARIHPWH evidence. These discussions do not settle exact-suffix reliability or current availability.

Based on discussion 3: hp water heater

Explore the discussions

Read our summaries here. Each original thread opens on Reddit only if you choose to follow its link.

r/heatpumps · Shopping and owner follow-ups

Anyone with American Standard's HPWH? on Reddit (opens in a new tab)

American Standard shoppers discuss distributor access and early ownership. An owner reports adequate hot water and low energy use, but mentions Wi-Fi setup and case vibration. An Ariston employee participates; disclose that affiliation and avoid treating promotional statements as independent.

Which model does this cover? American Standard-branded HPWH family discussion. The existing canonical ledger documents counterpart status; the Reddit thread itself is not proof of an exact Ariston ARIHPWH model identity.

r/heatpumps · Related-product owner experience

Rheem vs. American Standard HPWH, 65 vs 80 gallon on Reddit (opens in a new tab)

An American Standard 50-gallon owner reports adequate hot water and dehumidifier-like sound, using a second 50-gallon resistance tank in series. Consumption covers both tanks. This related-product setup is not an exact Ariston ARIHPWH review or a standalone 50-gallon capacity demonstration.

Which model does this cover? The relevant owner describes a 50-gallon American Standard unit without an exact suffix, installed in series with another 50-gallon resistance tank. This is not an exact ARIHPWH review. Named model labels: ASHPWH-65 (shopping candidate).

r/heatpumps · Shopping question

hp water heater on Reddit (opens in a new tab)

A shopper asks where to obtain American Standard ASHPWH-50, explicitly associating it with Ariston, and asks about practical noise and garage cooling. Replies mainly discuss alternatives. This is related-product shopping context, not an installed-owner review or evidence of Ariston reliability.

Which model does this cover? The shopper explicitly associates American Standard ASHPWH-50 with Ariston. That participant association alone is not manufacturer identity documentation or an exact ARIHPWH ownership report. Named model labels: ASHPWH-50.

How we read and use these discussions

These are our original summaries of publicly retrieved posts and comments, not a live Reddit feed or a verified-purchase review collection. The displayed date records our research read; a retrieved copy may lag the live thread. We do not claim to include every comment or verify owner identities. Questions, commercial participation, different capacities and generations stay labeled.

We do not turn thread participants into review totals, combine them with retailer ratings, infer failure rates, or use their quoted prices as current offers. Dated reading notes remain available as research; ratings and other time-sensitive source observations have separate expiry rules. Editorial re-reading is due seven days after the recorded read, without automatically changing that date.

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.

No eligible current seller price is available. A new source check is required before an amount can appear; expired prices are withheld.

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.