Is the RXP199i big enough for a whole house?

At 11.1 GPM and 199,000 BTU it handles most large homes with several bathrooms. Homes with very high simultaneous demand, such as multiple showers plus a tub fill, may still want two units or a storage tank.

Can it run on propane?

Yes. It ships configured for natural gas and the Smart Sense gas valve lets it be set for propane without buying a conversion kit.

Can I install it outdoors?

Yes, but only with the Versa-Vent adaptor, which is sold separately. Indoor installation needs proper venting and a condensate drain.

Does it really give instant hot water?

The built-in recirculation pump learns your usage patterns and preheats the line, so hot water arrives faster. It is not truly instant at every fixture, and recirculation uses some gas.

The heater itself, set for natural gas. The outdoor vent cap, venting pipe and condensate parts are separate purchases.

How does it compare with a tank water heater?

It takes far less floor space and never runs out of hot water, but it costs more to install and needs annual descaling in hard-water areas.

Where is the Rinnai RXP199i Tankless Water Heater cheapest?

At Amazon, for $2,067.80, as of our latest check.

Where can I buy the Rinnai RXP199i Tankless Water Heater?

3 stores we checked sell it, including Lowe's, The Home Depot, Amazon.

Rinnai RXP199i Tankless Water Heater

Best price now

$2,067.80at AmazonChecked 18 h ago

Compared across 3 stores. Prices are checked against each store and labelled with when. As an Amazon Associate, Deal.ai earns from qualifying purchases.

Visit Amazon

What reviewers say

Owners of Rinnai's high-capacity condensing units generally report strong, steady hot water and reliable operation over years of use. Complaints tend to center on installation cost and the extra parts needed for outdoor mounting rather than on performance.

What people mention

Hot water supplyPraisedOwners say it keeps up with several showers and appliances running together.
EfficiencyPraisedThe 98% UEF condensing design is cited as a reason buyers choose it over standard tankless models.
RecirculationMixedThe built-in pump speeds up hot water, but some owners note it can add gas use depending on how it is scheduled.
InstallationCriticisedBuyers report that professional gas, venting and condensate work make installation involved and costly.
Outdoor setupCriticisedOutdoor mounting needs the Versa-Vent cap, which is not included.

About the Rinnai RXP199i Tankless Water Heater

The Rinnai RXP199i is a condensing tankless water heater from the SENSEI Super High Efficiency Plus line, with a 98% UEF rating. It supplies hot water continuously and is about the size of a small suitcase.

The unit can be converted to run on either natural gas or propane, and no additional purchase is needed to do so. The Smart Sense gas valve adjusts to the fuel type. It can be installed indoors, or outdoors with a Versa Vent adaptor, which is sold separately.

A built-in recirculation pump learns your hot water usage patterns. It uses them to deliver hot water more quickly when it is needed.

Type

Condensing tankless water heater

Efficiency

98% UEF

Fuel

Natural gas or propane (convertible)

Max flow rate

11.1 GPM

Heat input

199,000 BTU

Installation