Rinnai REHP Series 50 Gallon Residential Hybrid Water Heater - REHP50

Power Rinnai REHP50 50-Gallon Hybrid (Heat Pump) Water Heater

Cut energy use while keeping showers steady and dishes moving. The Rinnai REHP50 is a residential electric heat pump water heater that pulls heat from the surrounding air and transfers it to water—delivering high efficiency with zero on-site emissions. With a UEF 3.75, a 73-gallon First-Hour Rating, and a 4.5 kW electric backup element, it’s sized right for busy households. A variable-speed fan and five operating modes help you tune performance, and the unit arrives duct-ready for tight spaces. ENERGY STAR and Tier-4 efficiency make rebates easier.

• Brand: Rinnai
• MPN: REHP50
• Type: Residential electric hybrid (heat pump + electric elements) storage water heater
• Size/Capacity: 50 gal nominal (46 gal rated); First-Hour Rating 73 gal
• Material/Finish: Glass-lined steel tank with anode; integrated variable-speed fan
• Performance: UEF 3.75; heat-pump operating range down to 37 °F ambient; recovery 27.5 GPH @ 90 °F rise; refrigerant R134a
• Connections/Fit: Hot/Cold 3/4? MNPT; condensate drain with included flexible tube (P-trap if tied to sewer); 208/240 V, 1-phase, 30 A dedicated circuit
• Dimensions: Approx. 66.4? H × 21.7? Dia (cylindrical); zero-clearance sides/top/back; allow top service access
• Included: Temperature & Pressure (T&P) valve, flexible drainage pipe & clamp, drain valve; slide-out air filter pre-installed
• Certifications: ENERGY STAR; NEEA Tier 4; CTA-2045 (AC) demand-response capable; Title 24 compliant; IRA 45L eligibility (builder)
• Warranty: 10-year tank & parts; 1-year reasonable labor (residential)

Save Energy & Lower Bills

With a UEF 3.75, the REHP50 is far more efficient than standard electric tanks. It moves heat instead of making it, then uses a 4.5 kW element only when needed— helping cut electricity costs while meeting hot-water demand. Qualifies for many local rebates and incentives.

Everyday Hot Water You Can Count On

A 73-gallon First-Hour Rating and 27.5 GPH recovery at a 90 °F rise keep showers, laundry, and dishes on schedule. Five operating modes let you prioritize highest efficiency, fastest recovery, or a balanced hybrid profile for daily use.

Durable Materials, Easier Care

The glass-lined tank is protected by an anode rod, and the top-mounted slide-out air filter makes maintenance quick. The package includes a T&P valve and drain hardware to simplify commissioning and annual service.

Installer-Friendly Design

Hot and cold connections are standard 3/4? MNPT. The unit ships duct-ready for tight spaces (kit optional), requires a 208/240 V, 30 A dedicated circuit, and includes a flexible condensate tube; add a P-trap if tying into a sewer line. Zero side/top/back clearance helps in closets and corners.

Sized Right For Your Space

The cylindrical footprint—about 21.7? diameter and 66.4? tall—fits many basements, laundry rooms, and garages. Plan for top service access per the manual and route the condensate line to an approved drain.

Smart Controls & Compatibility

Built-in CTA-2045 demand-response capability supports utility programs, and five operating modes (including Vacation) let you tailor performance to your schedule. Title 24 compliance and Tier-4 ratings simplify code approvals and rebate paperwork.

Quiet, Duct-Ready Operation

A variable-speed fan delivers whisper-quiet performance and can be ducted with the optional kit to manage airflow in tight or conditioned spaces—without compromising efficiency.