Endless Hot Water in a Compact Footprint: Rinnai SENSEI RXP199iN Condensing Tankless Water Heater

The Rinnai RXP199iN is a condensing tankless water heater that delivers hot water on demand instead of storing and reheating it in a tank, which is why it reaches a 0.98 Uniform Energy Factor and ENERGY STAR certification. At about the size of a small suitcase, this tankless unit puts out up to 11.0 GPM and 199,000 BTU, enough for multiple fixtures running at once without ever running out. It's built with an integrated Smart-Circ recirculation pump that learns your household's hot water habits, and Smart-Sense gas valve technology lets it run on natural gas or propane with no conversion kit. It installs indoors or outdoors with the optional Versa-Vent cap, giving plumbers and homeowners real flexibility on where it goes.

Key Features

Continuous, On-Demand Hot Water

Because the RXP199iN heats water only as it flows through rather than storing it in a tank, there's no standby loss and no risk of running out mid-shower. Its 0.98 UEF and ENERGY STAR certification put it among the most efficient tankless water heaters on the market, which translates directly into lower gas bills.

Built-In Smart-Circ Recirculation

The integrated multi-speed DC pump learns the household's hot water usage patterns and recirculates accordingly, cutting down the wait for hot water at the tap without wasting energy running constantly. A push-button option also lets you trigger recirculation on demand whenever you need it.

Smart-Sense Dual-Fuel Flexibility

Smart-Sense adaptive gas valve technology allows this water heater to run on either natural gas or propane without a separate conversion kit, which simplifies both stocking and installation. Smart Connect via Bluetooth pairs the unit with the Rinnai Central app for quick setup and registration.

Compact and Installation-Flexible

At roughly the footprint of a small suitcase, the RXP199iN fits tight mechanical spaces that a tank never could, and it supports up to 75 feet of 2" PVC/CPVC venting for placement flexibility. With the optional Versa-Vent cap, it can also be installed outdoors, and the whole unit is backed by a 15-year heat exchanger warranty.

Product Details

• 11.0 GPM maximum flow rate
• 199,000 BTU maximum input
• 0.98 Uniform Energy Factor
• ENERGY STAR certified
• Condensing technology for high efficiency
• Smart-Sense automatic natural gas or propane operation, no conversion kit needed
• Built-in Smart-Circ intelligent recirculation pump
• Push-button recirculation on demand
• Smart Connect Bluetooth setup via Rinnai Central app
• Indoor or outdoor installation with optional Versa-Vent cap
• Quick-Flush simplified maintenance
• Ultra Low NOx emissions
• Mobile home certified
• High altitude approved up to 10,200 ft
• 15-year heat exchanger warranty

Rinnai has been innovating home and water heating since 1920, offering high-efficiency tankless water heaters, boilers, and HVAC systems.

Additional Information

• Brand: Rinnai
• MPN: RXP199iN
• Series: SENSEI RXP
• Product Type: Condensing tankless water heater with integrated recirculation pump
• Fuel Type: Natural gas or propane (Smart-Sense, field switchable)
• Max Input: 199,000 BTU
• Flow Rate: 0.13 to 11.0 GPM
• Dimensions: 18.5" W x 25.8" H x 11.4" D
• Weight: 58 lb
• Connections: 3/4" NPT gas, 3/4" NPT hot and cold water, 1/2" NPT condensate
• Electrical: 120V, 60Hz, 4A max

Check out our article, Navien vs. Rinnai: Which Tankless Water Heater is Best?, to see how tankless models like the RXP199iN compare to traditional tank water heaters.

Rinnai RXP199iN FAQ

How much hot water can the RXP199iN actually deliver?

The RXP199iN puts out up to 11.0 GPM, which is enough to run multiple showers, a dishwasher, and a washing machine at the same time without ever running out, since it heats water on demand rather than pulling from a fixed tank. Actual output depends on incoming water temperature and the temperature rise needed, so colder climates will see a somewhat lower usable flow rate at the highest temperature settings.

Can the RXP199iN run on propane instead of natural gas?

Yes. Smart-Sense adaptive gas valve technology lets the unit run on either natural gas or propane without a separate conversion kit, which is a real advantage over older tankless models that required swapping parts to switch fuel types.

Can the RXP199iN be installed outdoors?

Yes, though it ships configured for indoor installation. Installing it outdoors requires the Versa-Vent outdoor vent cap, which is sold separately and adapts the unit for exterior mounting.

What's the difference between the RXP199iN and the RX199iN?

Both share the same 11.0 GPM, 199,000 BTU, and 0.98 UEF performance, but the RXP199iN adds Rinnai's integrated Smart-Circ recirculation pump built right into the unit. If you want faster hot water delivery to distant fixtures without installing a separate recirculation pump, the RXP199iN is the better fit; if you don't need recirculation, the RX199iN covers the same heating performance at a lower price point.

Does the labor warranty change if I don't register the unit?

Yes. The RXP199iN comes with a 15-year heat exchanger warranty and 5-year parts warranty regardless of registration, but the 5-year labor coverage only applies if you register the product within 90 days of installation. If you skip registration, labor coverage defaults to just 1 year, so it's worth doing right away.

If you have questions or need assistance sizing your pump, then the Plumbing Deals team can help! Use the live chat feature, email at contact@plumbingdeals.com, or give us a call at 888-682-5956!

Weight	63.0 lb
Collection	RX Series
Height	30.11 in.
Horse Power	1/3
Length	11.40 in.
Room	Utility
Type	Water Heater Only
Width	18.50 in.
Inventory Number	RINRXP199IN
MPN	RXP199IN

• Owner's Manual
• Brochure
• Submittal
• Conversion Manual