Super High-Efficiency Propane Tankless Water Heater

The RUS65EP is Rinnai's liquid-propane tankless water heater, built for homes that want to replace an electric storage tank or supplement an existing water-heating system with on-demand hot water. It is listed for indoor or outdoor installation and is suited to non-traditional spaces such as crawl spaces and attics. Rinnai's own copy describes the advantages as endless hot water, reduced electricity costs, and substantial space savings versus a storage tank.

It is rated for a minimum flow rate of 0.26 gallons per minute and runs on liquid propane. Overall dimensions are 34 inches high, 14.5 inches wide, and 22 inches deep, and it weighs 62 pounds. The unit includes automatic frost protection and is built to handle simultaneous hot-water use at multiple fixtures in any size home.

Installation requires mounting and is direct vented. A qualified installer should confirm clearances, propane-line sizing, venting, and local code before installation. California Proposition 65 warning applies to this product.

This listing is for the water heater itself. Gas piping, electrical connections, mounting hardware, and venting materials are not included unless stated.

Rinnai's limited warranty covers this unit for 5 years.

Delivery and returns: this water heater ships free by ground delivery and arrives within the window shown above. If it is not the right fit, return it free within 30 days in its original packaging.

• Installation and Clearances

  The source lists indoor or outdoor placement and describes installation in non-traditional areas such as crawl spaces and attics. Confirm the mounting surface, service access, weather exposure, combustion-air approach, and required clearances with a qualified installer. The product page does not give a numerical clearance schedule.

• Direct Venting

  Direct venting is required for this gas appliance. The product page does not list a vent diameter, approved vent system, route, or termination schedule. Confirm the current installation documentation, clearances, and termination requirements with a qualified professional before ordering vent materials.

• Liquid Propane Supply

  This listing is the Liquid Propane configuration and ships as one fuel-specific variant. The page does not give a gas-line size, pressure, or supply-capacity value. Have a qualified installer verify the propane service, regulator, supply capacity, connections, and local code before installation.

• Flow and Temperature Rise

  The source lists a 0.26 gallons-per-minute minimum flow rate. It does not give a maximum flow or temperature rise table, so delivered hot-water performance depends on incoming water conditions, the selected temperature, fixture demand, and installation. Confirm sizing with a qualified installer.

• Controls and Recirculation

  The product page does not describe a controller, app, pump, or recirculation system for this configuration. Plan temperature controls and any recirculation equipment with the installer, and verify compatibility, wiring, and accessory requirements before ordering. Do not assume these items ship with the heater.

• Efficiency and Power

  The source describes space savings and reduced electricity costs but does not provide a UEF, energy-factor, Energy Star, or electrical rating. Confirm the current efficiency documentation, voltage, circuit requirements, and installation conditions for the intended site with a qualified professional.

• Descaling and Maintenance

  The product page does not give a descaling procedure or maintenance interval. Water quality and use conditions affect service needs. Follow the current manufacturer documentation for flushing, descaling, cleaning, frost protection, and inspection, and use a qualified technician for gas-appliance service.

• Warranty Terms

  The page identifies an included limited warranty with a five-year length, but it does not detail the covered components, labor terms, registration steps, or installation conditions. Review the current written warranty and confirm its requirements before installation.

• What Ships

  The source identifies the tankless water heater but does not provide a complete in-the-box contents list. Confirm included parts before scheduling installation. Treat venting, propane connections, controls, recirculation equipment, and other installation materials as separate requirements unless the order explicitly says they are included.

Good to know

• 14.5 inches W x 22 inches D x 34 inches H; wall mounted.
• Liquid Propane configuration; verify regulator and supply sizing.
• Direct vent required; confirm diameter, route, termination, and clearances.
• Indoor or outdoor placement; confirm local code and service access.
• Professional installation is required for gas, venting, electrical, and water connections. Have a qualified installer confirm local code requirements, clearances, supply sizing, and commissioning before operation.
• Tankless water heater only. Installation materials, venting components, controls, and other items shown or required are not included unless explicitly stated.