It features 199,000 BTUs and hot water delivery with a flow rate that ranges from 0.26 - 9.8 GPM. The minimum GPMs is perfect for low demand uses such as shaving, where warm water is needed but not at a high rate! It is the ideal tankless solution for a home with 3 - 4 bathrooms. The RUR199 is optimal for simultaneous use of 3 - 6 fixtures at one time. So 2 people can shower and get ready to go out, while someone else is washing the dishes, and still have hot water to run a load of laundry or the dishwasher or both! Simultaneous fixture use is directly linked to the groundwater temperature. Please refer to the chart in the photos above. The MC-91-2US controller with the water heater as part of the front panel. The default minimum temperature setting is 98° with a maximum of 120°F. The unit offers a maximum setting of 140°F with parameter adjustment. A parameter adjustment on the RUR199 unit can be made for greater hot water flow - up to 11 GPM - as well.

In a condensing tankless water heater, such as the RUR199, once you turn on the tap, cold water goes into the tankless heater and the flame is activated. Water is pre-heated as it passes through the stainless steel heat exchanger then continues to be heated as it passes through the coils in the copper heat exchanger, exits the water heater, into your pipes, and up to the fixture calling for the hot water. Depending on the amount of hot water called for, the flame adjusts accordingly to heat more or less water.

Benefits of a Tankless Hot Water Heater:

• Endless hot water - Heats water as it goes through the pipes, offering endless hot water for your home (or business)
• Hot water on demand - Once you turn the water on, hot water runs through your pipes and out the faucet! Virtually no time or water is wasted waiting for the water to heat up
• Highly Efficient - Gallon for gallon, you will spend less money heating your hot water. With a tankless system, the water is heated on demand rather than sitting in a storage tank. A storage tank typically heats the water intermittently throughout the day and night not only when it is needed. This unit is Energy Star Qualified and features an Energy Factor of 0.96 (the closer to 1.0 the better)
• Long-lasting - Unlike a storage tank in which the water sits in the tank all the time creating sediment and rust, a tankless water heater will last longer
• EZ Connect - Allows for connection of two units together

Features

• Professional installation recommended, Rinnai for assistance
• ENERGY STAR qualified with a Uniform Energy Factor of 0.93
• 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
• Save time with hot water whenever and wherever you need it, any size home, even for simultaneous uses at multiple fixtures
• Save energy and reduce utility costs by operating only when hot water is needed
• Maximum output, minimum space and suitable for installation in non-traditional spaces such as crawl spaces and attics
• Multiple venting options available including PVC/CPVC using the Ubbink concentric to twin-pipe adapter allow for an easy installation
• Rinnai tankless water heaters provide an endless supply of hot water that remains uninterrupted, even when you're the last one in line for the shower.
• Tankless water heaters avoid the need to keep a large amount of reserve water heated at all times. This saves energy by only heating water when you need it, while an entirely electric ignition avoids the constantly wasted energy of a standing pilot light.
• Every SENSEI™ water heater is Wi-Fi compatible for remote monitoring and management.
• The Rinnai SENSEI™ series water heaters feature a fiber mesh premix burner that provides an even flame distribution for optimal performance and efficiency.
• The included stainless steel heat exchanger features corrosion-resistant properties to ensure reliable and long-lasting operation, while its superior efficiency puts the SENSEI™ series at the top of its class.
• Perfect for both new installs and retrofits, the SENSEI™ features the most flexible venting in the industry. Whether your install requires concentric, direct, room air, or common venting, the SENSEI™ series can handle it all.
• The SENSEI™ water heater features an adjustable mounting plate and a rotatable pressure relief valve to accommodate a variety of install applications.
• An easily accessible parameter adjustment allows for fast and simple servicing.
• Enables easy preventative maintenance, annual flushing, and serviceability.