Best Rinnai Water Heaters in 2025

4 Piece Tankless Water Heater Flush Kit. Helps maintain and extend the lifespan of your tankless water heater

Kit comes with 3.5 gallon bucket with lid, 1/6 HP Pump, and 2 Steel hoses. Just add 2-3 gallons of vinegar or your own descaling solution

Works with most all tankless water heaters such as Rinnai, Bosch, Noritz, Rheem, Takagi, Tempra, Navien, Ecosmart, Stiebel, Eccotemp, Atmor, Trutankless, Marey Power, and others.

On demand a continuous and unlimited supply of hot water

Sleek design saves space and no venting required, It also features two different temperature memory presets, making it easy to adjust for personalized needs.

Requires hard-wired 240 or 208-volt electric service, with a maximum draw of 28,800 watts at 240 volts or 21,600 watts at 208 volts

Original Design: Tankless hot water heater only heats when necessary to conserve energy; For the latest in non-condensing technology and a cleaner layout that speeds up service and installation, check out our new RE160iP model

Never Run Out of Hot Water with this Compact Propane Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 6.5 GPM (5 fixtures at once)

Smart, Durable Design: Enhanced scale detection helps prevent serious, long-term damage to unit; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)

***Kit requires 2 gallons of white vinegar*** Not included. Some tankless manufacturers recommend using vinegar or another cleanser for flushing their equipment. Can also save money if you have vinegar at home already.

Helps maintain the performance and extend the life of your tankless hot water heater. Easy directions for DIY Homeowner use.

Includes 1/8 HP Utility Pump, 6 Ft Color Coded Hoses, 3.5 Gallon Bucket with EZ Open Lid & Instructions for using vinegar. Peel Off Lid is super flexible and much easier to remove than traditional paint bucket lids.

Original Design: Tankless hot water heater only heats when necessary to conserve energy; For the latest in non-condensing technology and a cleaner layout that speeds up service and installation, check out our new RE180iP model

Never Run Out of Hot Water with this Compact Propane Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 7.5 GPM (5 fixtures at once)

Smart, Durable Design: Enhanced scale detection helps prevent serious, long-term damage to unit; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)

Original Design: Tankless hot water heater's Circ-Logic technology offers recirculation patterns that match your habits; For the latest in non-condensing technology that speeds up service and installation, check out our new RE160iP model

Never Run Out of Hot Water with this Compact Propane Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 7.5 GPM (5 fixtures at once)

Smart, Durable Design: Includes 12-, 5-, and 1-year residential guarantee and 5-, 5-, and 1-year commercial factory warranty for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)

Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended

Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary

Optimal Water Pressure: High-performance up to 5.3 GPM hot water flow rate for a powerful, constant stream

Discontinued. Please see new model RSC199iP

Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary

Optimal Water Pressure: Up to 11 GPM hot water flow rate for a powerful, constant stream

ON/OFF Dial Control with adjustable digital temperature display

Self-modulating power control

24kW Model Flow Rate: up to 5.9 GPM for RTEX-24

Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended

Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary

Optimal Water Pressure: Up to 7 GPM hot water flow rate for a powerful, constant stream

Original Design: Tankless hot water heater only heats when necessary to conserve energy; For the latest in non-condensing technology and a cleaner layout that speeds up service and installation, check out our new RE199iN model

Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 9.8 GPM (6 fixtures at once)

Smart, Durable Design: Enhanced scale detection helps prevent serious, long-term damage to unit; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)

Exclusive Water Savings technology conserving up to 1, 100 gallons per year

157, 000 BTU (gas consumed per hour)

Exclusive Hot Start Programming minimizes cold water burst by staying in ready-fire state

Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended

Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary

Optimal Water Pressure: High-performance 6.5 GPM hot water flow rate for a powerful, constant stream

Energy and Space Efficient: Space-saving design conserves energy as it only heats when necessary; multiple venting options offer installation flexibility

Optimal Water Pressure: High-performance 11 GPM hot water flow rate for a powerful, constant stream

Instant Heating: Circ-Logic technology enables recirculation patterns that coincide with your typical habits; Wi-Fi monitoring creates hot water on demand

Hot water heater: Heat the whole house with this boiler featuring a self-cleaning stainless-steel heat exchanger with a modulating wire mesh burner and a secondary flat plate heat exchanger for showers and faucets

Smart Features: Multizone control capability allows thermostat and control pumps to connect directly to the boiler that warms the house and the tap water; smart heater features a safety child-lock that automatically turns off central heating

User-Friendly Interface: Electric heater features a digital display main screen, a temperature and pressure display, and an outdoor reset sensor with easy parameter settings; up/down arrows adjust the temperature between 104°F and 180°F

Hot water without the wait - or the waste

Low operating cost - High energy efficiency and water savings setting

Space Savings - Compact, space-saving design. Perfect for a tank replacement.

Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended

Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary

Optimal Water Pressure: High-performance 7.5 GPM hot water flow rate for a powerful, constant stream

Smart-Circ Intelligent Recirculation: This tankless hot water heater features Smart-Circ technology that learns your water usage patterns, then schedules pump and recirucation accordinlgy for superior energy efficiency and convenience

Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This indoor condensing tankless hot water heater from Rinnai is only the size of a small suitcase, but provides up to 11 GPM (7 fixtures at once)

Smart, Durable Design: With multiple venting options, water heater fits a wide array of spaces; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)

Condensing Technology - The EZ Ultra HE uses exhaust gas to preheat incoming water for added efficiency.

This heater can be vented horizontally or vertically using 2" Solid Core Schedule 40 PVC/CPVC

Back-draft prevention device and stainless steel horizontal vent pipe are included.

Hot Water Heater: Heat the whole house with this boiler featuring a stainless-steel heat exchanger with a modulating wire mesh burner and a built-in domestic hot water plate heat exchanger for showers and faucets

Smart Features: Multizone control capability allows thermostat and integrated control pumps to connect directly to the boiler that warms the house and the tap water; smart heater features a safety child-lock that automatically turns off central heating

User-Friendly Interface: Electric heater features a digital display main screen, a temperature and pressure display, and an outdoor reset sensor with easy parameter settings; adjust the CH temperature between 104°F and 180°F and DHW between 98°F and 140°F

Smart Design: Improved design of tankless hot water heater only heats when necessary to conserve energy; Speeds installation and enhances serviceability with a cleaner internal layout; LED screen provides service reminders and error codes

Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This non-condensing indoor tankless hot water heater from Rinnai is only the size of a small suitcase, but provides up to 5.3 GPM (5 fixtures at once)

Smart, Durable Design: Water heater fits a wide array of spaces; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)

Stainless steel heat exchanger

Indoor and outdoor applications

Advanced multi-line control panel