50 Gal. Tall Water Heater, Residential, Electric

The Rheem MR50245C Marathon Series 50-Gallon Electric Water Heater delivers superior efficiency, durability, and performance with a lightweight, non-metallic tank design.

The Rheem MR50245C Marathon Series Electric Water Heater offers exceptional energy efficiency and long-lasting reliability for residential hot water applications. Featuring a 50-gallon polybutene tank that resists corrosion and eliminates the need for anode rods, this non-metallic unit provides maintenance-free operation. Engineered with 4500-watt heating elements and a 240-volt electrical system, it delivers fast recovery and dependable hot water output while maintaining an impressive 0.95 energy efficiency rating.

• Model number MR50245C identifies the Rheem Marathon Series 50-Gallon Tall Electric Water Heater.
• Designed for residential hot water systems requiring efficiency, reliability, and corrosion resistance.
• Provides 21 gallons per hour recovery rate and exceptional insulation performance.

Technical Data & Performance

• Product Type: Electric Water Heater.
• Brand: Rheem.
• Series: Marathon® – premium non-metallic tank water heaters with lifetime tank durability.
• Tank Capacity: 50 gallons (189 liters).
• Orientation: Tall model for upright, floor-mounted installation.
• Voltage Rating: 240 VAC.
• Power Rating: 4500 watts (4.5 kW).
• Energy Efficiency: 0.95 Uniform Energy Factor (UEF) – exceeds federal efficiency standards.
• Recovery Rate: 21 gallons per hour (GPH) at 90°F rise.
• Maximum Working Pressure: 150 psi.
• Tank Material: Polybutene inner tank with fiberglass outer shell – rustproof, corrosion-resistant, and impact-resistant.
• Insulation Type: Non-CFC polyurethane foam insulation provides exceptional heat retention and efficiency.
• Water Connection Size: 3/4 inch NPT – top-mounted hot and cold water connections.
• Tank Design: Seamless, blow-molded polybutene construction eliminates corrosion and tank leaks.
• Heating Element Type: Dual stainless steel elements for durability and fast heating response.
• Thermostat Control: Automatic temperature control with over-temperature protection.
• Anode Rod: Not required due to non-metallic, corrosion-resistant tank design.
• Drain Valve: Full-port brass drain valve for easy tank maintenance and flushing.
• Outer Jacket: Fiberglass shell – lightweight and dent-resistant.
• Dimensions:
  • Diameter: 23-1/2 inches.
  • Height: 62-3/4 inches.
• Weight: Approx. 100 lbs (empty) for easy handling and installation.
• Mounting Type: Floor-mounted vertical installation.
• Application: Designed for residential hot water systems including single- and multi-family dwellings.
• Performance: Provides consistent hot water output with low standby heat loss.
• Corrosion Resistance: Non-metallic polybutene tank prevents rust and eliminates water discoloration issues.
• Electrical Connection: Hardwired 240V, dual-element configuration.
• Safety Features:
  • Over-temperature shutoff for safety.
  • Pressure relief valve port (valve sold separately).
• Compliance:
  • Complies with UL 174 and CSA C22.2 No. 110 safety standards.
  • Meets DOE 2015 energy efficiency regulations.
• Environmentally Friendly: Non-CFC insulation and fully recyclable tank components.
• Maintenance: Low-maintenance design – no anode replacement required.
• Installation: Simple top-entry plumbing and wiring connections reduce installation time.
• Application Range: Ideal for residential homes, apartments, cabins, and replacement installations.
• Warranty: Lifetime limited tank warranty and 6-year parts warranty from Rheem.

Applications & Benefits

• Provides efficient and consistent hot water supply for residential households.
• Non-metallic polybutene tank eliminates corrosion, rust, and anode maintenance.
• High efficiency (0.95 UEF) lowers energy costs while maintaining strong performance.
• Lightweight and easy to install due to fiberglass shell construction.
• Ideal for long-term use in environments with hard or aggressive water chemistry.