Best Compact Heat Exchanger

Rinnai RUS65EN Tankless Hot Water Heater, 6.5 GPM, Natural Gas, Outdoor Installation

Endless Hot Water: Enjoy unlimited hot water flow throughout the house.
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.
Multiple venting options available including PVC/CPVC using the Ubbink Concentric to Twin Pipe adaptor allow for an easy installation.
Guaranteed to Last: 12-, 5-, and 1-year residential factory warranty for heat exchanger, parts, and labor respectively.

Endless Hot Water: Enjoy unlimited hot water flow throughout the house.
Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary.
Optimal Water Pressure: High-performance 9.8 GPM hot water flow rate for a powerful, constant stream.
Instant Heating: Equipped with Circ-Logic - Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation.
Guaranteed to Last: 12-, 5-, and 1-year residential and 5-, 5-, and 1-year commercial factory warranty for heat exchanger, parts, and labor respectively.

Endless Hot Water: Enjoy unlimited hot water flow throughout the house.
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.
Instant Heating: Equipped with Circ-Logic - Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation.
Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively. Wifi monitoring..

Endless Hot Water: Enjoy unlimited hot water flow throughout the house.
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.
Instant Heating: Equipped with Circ-Logic - Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation.
Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively. Wifi monitoring..

Endless Hot Water: Enjoy unlimited hot water flow throughout the house.
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.
Instant Heating: Equipped with Circ-Logic - Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation.
Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively. Wifi monitoring..

Endless Hot Water: Enjoy unlimited hot water flow throughout the house.
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.
Instant Heating: Equipped with Circ-Logic - Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation.
Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively. Wifi monitoring..

Endless Hot Water: Enjoy unlimited hot water flow throughout the house.
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.
Instant Heating: ThermaCirc360 technology provides faster hot water with a built-in recirculation pump, timer and thermal bypass valve - ideal for homes without a dedicated return line.
Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively. Wifi monitoring..

Endless Hot Water: Enjoy unlimited hot water flow throughout the house.
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.
Instant Heating: Equipped with Circ-Logic - Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation.
Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively. Wifi monitoring..

Endless Hot Water: Enjoy unlimited hot water flow throughout the house.
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.
Instant Heating: Equipped with Circ-Logic - Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation.
Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively. Wifi monitoring..

Endless Hot Water: Enjoy unlimited hot water flow throughout the house.
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.
Instant Heating: Equipped with Circ-Logic - Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation.
Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively. Wifi monitoring..