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Rinnai REHP80BM 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 · Rinnai

Rinnai REHP heat-pump water heater buying guide

Rinnai's 208/240V integrated REHP family covers 50-, 65-, and 80-gallon models, five operating modes, and CTA-2045 demand response. The catalog-bound representative is REHP80BM, while current public retail pages more often list the transitioned REHP50, REHP65, and REHP80 model numbers.

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.

Current public REHP model names are shown. Verify the exact suffix on the order because older certification and builder records can include suffixes.

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
50 galREHP50Narrowest REHP model. $1,769.00 Lowe's Check exact-model listing for REHP50 (opens in a new tab)
Why this price?Public exact REHP50 listing displayed shipping and delivery inventory; local availability can vary.Observed 2026-09-04; verify current price and availability.
 66.4 in H × 21.7 in diameter 700 ft³; 84–700 ft³ w/ louvers
Requirement detailsThe official 2026 manual says rooms above 700 ft³ need no added ventilation. Unducted rooms larger than 84 ft³ and below 700 ft³ require a fully or double-louvered door with 250 in² total net free area and 5 ft grille separation. It also documents a separate unducted 'room smaller than 450 ft³' arrangement with no numeric minimum, a 24 in² under-door air gap, an exhaust-height louver, and exhaust within 12 in of the door. Fully ducted rooms below 85 ft³ have no stated minimum; partially ducted rooms below 85 ft³ have no stated minimum but require the page-16 transfer-air arrangement. The overlapping 84/85/450 wording is preserved verbatim rather than silently normalized. Installation source for REHP50 (opens in a new tab).
 49 dBA
Sound evidenceENERGY STAR exact-record sound_pressure_level Sound source for REHP50 (opens in a new tab).
 46 gal 73 gal 3.75 208–240V
30A		 218 lb
65 galREHP65Slightly shorter, wider, and higher-delivery than the 50. $2,049.00 Lowe's Check exact-model listing for REHP65 (opens in a new tab)
Why this price?Public exact REHP65 listing displayed shipping and delivery inventory; local availability can vary.Observed 2026-09-04; verify current price and availability.
 65.5 in H × 25.6 in diameter 700 ft³; 84–700 ft³ w/ louvers
Requirement detailsThe official 2026 manual says rooms above 700 ft³ need no added ventilation. Unducted rooms larger than 84 ft³ and below 700 ft³ require a fully or double-louvered door with 250 in² total net free area and 5 ft grille separation. It also documents a separate unducted 'room smaller than 450 ft³' arrangement with no numeric minimum, a 24 in² under-door air gap, an exhaust-height louver, and exhaust within 12 in of the door. Fully ducted rooms below 85 ft³ have no stated minimum; partially ducted rooms below 85 ft³ have no stated minimum but require the page-16 transfer-air arrangement. The overlapping 84/85/450 wording is preserved verbatim rather than silently normalized. Installation source for REHP65 (opens in a new tab).
 49 dBA
Sound evidenceENERGY STAR exact-record sound_pressure_level Sound source for REHP65 (opens in a new tab).
 61 gal 80 gal 3.9 208–240V
30A		 271 lb
80 galREHP80Largest REHP capacity and first-hour delivery. $2,299.00 Lowe's Check exact-model listing for REHP80 (opens in a new tab)
Why this price?Public exact REHP80 listing showed shipping and delivery inventory; local availability can vary.Observed 2026-09-04; verify current price and availability.
 74.2 in H × 25.6 in diameter 700 ft³; 84–700 ft³ w/ louvers
Requirement detailsThe official 2026 manual says rooms above 700 ft³ need no added ventilation. Unducted rooms larger than 84 ft³ and below 700 ft³ require a fully or double-louvered door with 250 in² total net free area and 5 ft grille separation. It also documents a separate unducted 'room smaller than 450 ft³' arrangement with no numeric minimum, a 24 in² under-door air gap, an exhaust-height louver, and exhaust within 12 in of the door. Fully ducted rooms below 85 ft³ have no stated minimum; partially ducted rooms below 85 ft³ have no stated minimum but require the page-16 transfer-air arrangement. The overlapping 84/85/450 wording is preserved verbatim rather than silently normalized. Installation source for REHP80 (opens in a new tab).
 49 dBA
Sound evidenceENERGY STAR exact-record sound_pressure_level Sound source for REHP80 (opens in a new tab).
 74 gal 91 gal 4 208–240V
30A		 290 lb

Check the official size specification from Rinnai U.S. REHP brochure (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
Rinnai publishes a warranty document for the REHP family through its product resources. Exact years and coverage conditions should be verified against the current written warranty for the purchased suffix before checkout.Official warranty terms for Rinnai REHP80BM (opens in a new tab)
Smart-home control
CTA-2045 demand response is documented. That does not by itself verify consumer Wi-Fi/app or smart-home control for the exact model.Official controls source for Rinnai REHP80BM (opens in a new tab)

Pros

  • Three current family sizes have broad retail/plumbing-supply availability and multiple public prices.
  • The linked Lowe's listing provides the largest current source-specific retailer sample among the reviewed Rinnai sources.

Cons

  • Its published 49 dBA sound level is louder on paper than GE Profile at 41 dBA, LG at 42–45 dBA, and A. O. Smith at 45 dBA.
  • The reviewed family lacks consumer app control, while GE Profile, LG, Rheem, Ariston, and Cala all document connected homeowner controls.

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 shown: the de-duplicated Lowe's family population, a separate owner discussion, and an independent lab evaluation of REHP50.

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

  • Quiet or acceptable garage sound and dependable hot water recur
  • Owners mention straightforward controls and energy savings

Owners flag

  • Heavy handling and side-connection details complicate installation
  • No consumer Wi-Fi/app control is available in the reviewed family

Lowe's

REHP50 Lowe's listing
Rating: 4.4/5

Current source aggregate · 53 source-hosted entries

The retailer shows 4.4 out of 5 from 53 reviews and 92% recommending. Praise commonly covers quiet or acceptable sound, hot-water delivery, economy modes, and perceived savings; concerns include heavy handling, side connections, delivery, rebates, and service.

Related listing with explicit scope: Lowe's syndicates essentially the same REHP family population across size pages, so it is represented once. The page says ratings may include incentivized entries.

REHP family on Reddit (opens in a new tab)

Reddit owner discussion · r/heatpumps
Owner reports: 5 owner reports

Identifiable owner reports

Discussion summary: Owners discuss generally quiet garage operation, hot-water recovery, controls, handling, and the lack of Wi-Fi. Early reports are useful for usability context but too young for long-term reliability.

Related listing with explicit scope: The thread contains self-selected REHP owners across sizes. It is not a verified-purchase population.

Consumer Reports lab evaluation

REHP50
Professional evaluations: 1 evaluation

Independent professional evaluation

The independent lab page confirms that REHP50 was evaluated as a current heat-pump water heater. We retain that source relationship without reproducing gated scores or claiming an owner consensus.

Related listing with explicit scope: Consumer Reports tested the exact public REHP50 SKU. Its detailed score is subscriber-gated and is not copied here.

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.