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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.

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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.

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

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
50 galREHP50Narrowest REHP model.	Price withheld pending our next source check WebstaurantStore View retailer source for REHP50 (opens in a new tab) Exact REHP50: quantity 1 and enabled Add to Cart; usual shipment in 1 business day. The advertised lead time is not a confirmed stock quantity. Optional protection and Plus shipping are not included in the equipment price. 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.	66.4 in H × 21.7 in diameter	700 ft³; 84–700 ft³ w/ louvers Requirement details The 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 evidence ENERGY 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.	Price withheld pending our next source check WebstaurantStore View retailer source for REHP65 (opens in a new tab) Exact REHP65: quantity 1 and enabled Add to Cart; usual shipment in 1 business day. The advertised lead time is not a confirmed stock quantity. Optional protection and Plus shipping are not included in the equipment price. 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.	65.5 in H × 25.6 in diameter	700 ft³; 84–700 ft³ w/ louvers Requirement details The 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 evidence ENERGY 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.	Price withheld pending our next source check Lowe's View retailer source for REHP80 (opens in a new tab) Exact REHP80. Lowe's existing Roeland Park / ZIP 66205 reference session showed quantity 1 and enabled Add to Cart; this is not a shopper location. No current stock quantity or arrival date was retained. 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.	74.2 in H × 25.6 in diameter	700 ft³; 84–700 ft³ w/ louvers Requirement details The 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 evidence ENERGY 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

The family provides 50-, 65- and 80-gallon choices; dated offers keep each listed model and capacity separate instead of assuming that one size’s purchase options apply to all three.
The separately attributed Lowe's review section helps distinguish installation and retailer-service experiences from heater performance.

Cons

The 49 dBA federal-record figure shown in the size table is higher than GE Profile's as-low-as 41 dBA, LG's mode-specific 42–45 dBA, and A. O. Smith's 45 dBA disclosures. Unmatched test conditions prevent a direct installed-loudness ranking.
Consumer app control was not verified for the exact model; CTA-2045 demand response alone does not establish it. If remote homeowner control is essential, GE Profile, LG, Rheem, Ariston, and Cala have documented connected controls to evaluate.

REHP65 and REHP80 owners provide practical installation and controls experiences. The REHP50 discussion is primarily prospective-buyer research; exact-model relevance alone does not make it an owner review.

Everyday operation and handling

Owners discuss sound, operating modes and anode access. The family thread also includes an initial temperature-sensor fault; positive and negative accounts should both be read as individual installations.

Based on discussion 1: Any experience w/Rinnai HPWH?

Scheduling needs a closer look

REHP65/80 owners discuss programming gaps and copy-function workarounds. Replies disagree about app compatibility, so the discussion is not a substitute for verified instructions for your unit.

Based on discussion 3: Help: Program Schedule Rinnai REHP65 Hybrid Water Heater

The 50-gallon evidence gap

The REHP50 question raises sensible concerns about recovery, controls and a tight installation space. It provides little installed-owner history and no long-term reliability conclusion.

Based on discussion 2: Rinnai REHP HPWH Feedback [REHP50]

Explore the discussions

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

r/heatpumps · Family owner experiences

Any experience w/Rinnai HPWH? on Reddit (opens in a new tab)

Owners discuss 65- and 80-gallon installations, handling, sound, operating modes, and anode access. Later replies raise scheduling difficulties and an initial temperature-sensor fault. Reports span households and sizes, providing usability context rather than reliability statistics.

Which model does this cover? Contains explicitly identified REHP65 and REHP80 owners alongside broader REHP purchasing questions.

r/heatpumps · Prospective-buyer question

Rinnai REHP HPWH Feedback [REHP50] on Reddit (opens in a new tab)

A prospective REHP50 buyer asks about noise, controls, anode replacement, recovery, and fitting a constrained space. Replies discuss sizing and installation tradeoffs, but the thread offers little confirmed ownership history and no long-term reliability conclusion.

Which model does this cover? Original title and question identify REHP50; exact-model relevance does not imply an owner review.

r/heatpumps · Owner controls troubleshooting

Help: Program Schedule Rinnai REHP65 Hybrid Water Heater on Reddit (opens in a new tab)

REHP65 and REHP80 owners compare scheduling problems, copy functions, and gaps between programmed periods. Several describe workarounds, while app connectivity remains disputed. Treat suggestions as owner experiences, not manufacturer-verified operating instructions or confirmed remote-control compatibility.

Which model does this cover? Original poster explicitly owns REHP65; multiple responding owners identify REHP80.

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.