Rinnai’s reputation in tankless water heaters is built on reliable, high-output performance. The RX199iN stands out with its convertible fuel system and flexible installation, making it a uniquely adaptable solution for a demanding household.

With a 199,000 BTU output and a flow rate of 11.1 gallons per minute, this unit can supply multiple showers and appliances simultaneously without a drop in pressure. The Smart Sense gas control is the reason it can switch between natural gas and propane with a simple kit, offering long-term fuel flexibility. The Versa Vent system means you can install it indoors or outdoors, simplifying placement and freeing up interior space. At a 0.98 Uniform Energy Factor, it operates with notable efficiency, minimizing wasted energy and gas costs.

You’ll need a 120-volt outlet for its 98-watt electronics, and professional installation is non-negotiable to handle the gas line and venting. For a large home wanting endless hot water without a bulky tank, the RX199iN delivers robust performance with uncommon adaptability.