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The Rinnai RX199 is a natural gas condensing tankless water heater rated at 199,000 BTU and up to 11.1 GPM with a valve. It runs at a 0.98 Uniform Energy Factor, so almost all the heat goes into the water. It is small enough to mount on a wall like a suitcase and can be installed indoors or outdoors. It suits larger homes with several bathrooms that want endless hot water and no tank. Against non-condensing tankless units it is more efficient; against smaller tankless models it delivers more flow, but it needs a gas line and venting sized for its full input.
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The Rinnai RX199 is a natural gas condensing tankless water heater. It supplies a continuous flow of hot water for uses such as showers, dishes and laundry.
It has an internal 199,000 BTU rating and a maximum flow of 11.1 GPM with valve. The unit is about the size of a small suitcase and can be installed indoors or outdoors.
