Is the Rheem PROPH80 T2 RH400-SO right for your home?
The Rheem PROPH80 T2 RH400-SO is the 80-gallon Professional Prestige ProTerra hybrid with LeakGuard and top water connections. Its larger stored volume is worth considering when consecutive showers, bathtub fills or overlapping use put pressure on a smaller tank. WHE sizes it around your busiest hot-water period and checks whether the property can accommodate the complete installation.
This is a residential hybrid heat-pump model, distinct from Rheem’s 80-gallon commercial resistance heaters and earlier ProTerra generations. The full RH400-SO model number matters when comparing electrical requirements, dimensions and leak-protection equipment.
Capacity, efficiency and hot-water delivery
Rheem lists 80 gallons nominal capacity, 72 gallons rated storage, 4.07 UEF and a 87-gallon first-hour rating for this exact model. The July 2025 specification sheet also lists 27 gallons per hour recovery at a 90°F temperature rise. First-hour rating measures delivery under test conditions; it is not the amount stored in the tank or a promise for every usage pattern.
The unit is ENERGY STAR certified. Its operating modes include Energy Saver, Heat Pump, High Demand, Electric and Vacation/Away. The manual describes Energy Saver as balancing compressor operation with electric assistance, while High Demand uses compressor and electric heat together. Air temperature, mode, incoming water temperature and demand affect performance. A series-wide savings figure is not a household cost estimate.
Dimensions: body height versus the ducted drawing
The specification drawing lists 74 3/16 inches body height (A) and 24¼ inches body diameter (B). The height to the top of the illustrated shutoff valve is 79 5/16 inches (L). Plan dimensions F and G are 29½ and 24⅝ inches; fittings and the drawing’s relief-valve allowance must be considered along with the tank diameter.
Rheem’s product page displays 91 inches as height. That matches dimension H, 91 inches, with the illustrated duct elbow, rather than the body-height dimension. WHE checks the actual top- or side-connection layout, valve access, duct arrangement and filter removal space. Neither the body height nor the ducted drawing alone establishes the final installation clearance.
The published empty unit weight is 261 pounds, with an approximate shipping weight of 306 pounds. We review the support surface and access path for the filled heater as part of placement planning.
Airflow, condensate and installation space
A heat pump needs usable air volume, and its fan and compressor affect where it belongs in the home. Rheem lists an ambient operating range of 37–145°F. WHE checks airflow, nearby living spaces, service access and the route for condensate before recommending a location. This is indoor electric equipment with no gas connection or combustion flue; air ducting may still be needed.
Rheem’s linked documents differ on room-volume guidance. The AP23657 Rev. 04 manual uses more than 1,200 cubic feet of unoccupied air space for an unducted room needing no added ventilation, and calls for louvers in its 700–1,200-cubic-foot example. The July 2025 specification sheet uses a more-than-700-cubic-foot example. WHE verifies the instructions supplied with the exact unit and the proposed ventilation or ducting; tank fit alone is not sufficient.
The manual calls for 6 inches above the heater for airflow and filter access and keeps the unducted exhaust at least 6 inches from walls or hard surfaces. Condensate needs a suitable drain route or pump; the manual says not to discharge it into the water-heater drain pan. Water and condensate connections are ¾-inch NPT. WHE also reviews relief discharge, water pressure and thermal expansion.
Electrical requirements and LeakGuard
This RH400-SO model uses 208–240V single-phase power. Its specification row lists a 30-amp breaker, 4,500W element rating at 240V, 5,000W total unit wattage and 21A maximum. At 208V, Rheem says element output drops to 3,375W. WHE verifies the supplied nameplate, circuit, disconnect and grounding rather than borrowing the requirements of a separate 15-amp or 120V model.
LeakGuard includes a factory-installed leak-detection cable and an automatic shutoff valve supplied with the heater. Correct valve installation and commissioning matter. Leak protection does not replace sound plumbing, drainage or maintenance. Built-in EcoNet Wi-Fi supports remote controls and monitoring with a compatible internet connection, and EcoPort provides a demand-response interface.
How the 50- and 80-gallon models compare
The 50-gallon PROPH50 T2 RH400-SO has 45 gallons rated storage, a 67-gallon first-hour rating and 3.88 UEF. Moving to this 80-gallon model adds 27 gallons of rated storage and 20 gallons in the first-hour test, but both list 27 GPH recovery at a 90°F rise. Extra storage helps with an initial peak; it does not establish unlimited hot water.
The 80-gallon body is 12 7/16 inches taller and 2 inches larger in diameter than the 50-gallon body. Access doors, overhead piping, drain-pan space and the support surface can decide whether that increase is practical. WHE also reviews the operating mode and usage pattern instead of selecting the larger model solely for its higher UEF.
Maintenance and limited warranty
Keep the washable air filter accessible, and include condensate drainage, anode condition, sediment and leak-system checks in the service discussion. If the home has recirculation, WHE reviews its controls and piping; the linked manual recommends on-demand operation because circulation adds load to the heater.
Rheem lists a 10-year limited tank-and-parts warranty, subject to the applicable Residential Warranty Certificate. That listing should not be read as ten years of installation labor or unconditional replacement. WHE confirms the proposed equipment, availability, price and any installation coverage with the estimate.
Manufacturer references: Rheem PROPH80 T2 RH400-SO product page, July 2025 specification sheet, 07.25-RH-HEHP-400-SO-SS and use and care manual, AP23657 Rev. 04. The photo is Rheem’s shared RH400-SO series image; dimensions vary by capacity. Confirm the delivered unit’s model label and supplied instructions before installation.
PROPH80 T2 RH400-SO frequently asked questions
Does this 80-gallon ProTerra have 80 gallons of rated storage?
Rheem lists 80 gallons nominal capacity and 72 gallons rated storage for PROPH80 T2 RH400-SO. Its first-hour rating is 87 gallons under standardized testing.
Is the heater itself 91 inches tall?
The 91-inch figure is dimension H with the illustrated duct elbow. The drawing lists body height A at 74 3/16 inches and height L at 79 5/16 inches with the shown shutoff valve. The selected piping and duct layout determines the full required space.
Does the 80-gallon model recover faster than the 50-gallon SO model?
Both publish 27 gallons per hour at a 90°F rise. The 80’s larger storage and higher first-hour rating are useful distinctions, but they do not mean every operating mode reheats at the same rate.
Does it require a gas line or exhaust flue?
No. This is electric equipment with no combustion flue. It does need suitable airflow for the heat pump, and some locations require air ducting or ventilation. Those air ducts serve a different purpose from a gas-heater flue.
Can WHE connect it to my recirculation system?
The existing system needs review. Rheem’s linked manual recommends on-demand recirculation to limit added demand on the heat pump. WHE checks the pump controls, piping and insulation before confirming compatibility.
Request a WHE hybrid water heater estimate
For faster service, text photos of your existing model label, connections and installation space to 561-602-9062. Include room measurements, the nearest drain and any overhead restrictions if you can check them safely. WHE can review hybrid water heater installation options and explain the proposed work. Use the estimate button above to start your request.