Name: Rinnai Sensei RX199i
Brand: Rinnai
Price: 1532.79 USD

A top choice for a large home that wants one heater for three or more showers at once with the lowest gas bills Rinnai offers.

Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros

Runs on natural gas or propane out of the box, so a fuel change needs no conversion kit
A 0.98 UEF wastes very little gas, which cuts running costs in a big household
Vents with cheap PVC indoors, or goes outdoors with a vent cap, so it fits most homes
15 year heat exchanger warranty and 5 years of parts and labor when registered

Cons

Wi-Fi control costs extra with the control-r module
Heat exchanger cover ends at 12,000 operating hours if that comes before 15 years
Condensing unit needs a condensate drain and, in many areas, a neutralizer

The Rinnai Sensei RX family

Every Rinnai Sensei RX model we rank, smallest first. Ratings compare each against its own fuel.

Model	Heating power	Rating	Price
Rinnai Sensei RX160i	160,000 BTU/h	3.8/5	$1,298.43
Rinnai Sensei RX199i (this one)	199,000 BTU/h	4.3/5	$1,532.79

How it scores

The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its fuel. How we rank explains each one.

Heating
Model number	REU-NB3237FF-US
Fuel	Gas
Gas type	Natural gas or propane
Gas input	15,000 to 199,000 BTU/h
Max flow	11 GPM
UEF	0.98
Condensing	Yes
ENERGY STAR	Yes
Installation
Venting	Both
Vent type	2 in or 3 in PVC/CPVC/PP, or concentric
Weight	55 lb
Features
Built-in recirculation	No
Wi-Fi	No
Heat exchanger warranty	15 years
Parts warranty	5 years

A well priced condensing whole home heater for buyers who want PVC venting and lower gas bills.

$1,411.70

A strong value outdoor heater for a natural gas home in a mild climate, with a better warranty than most budget rivals.

$499

A whole home indoor heater for buyers who want maximum burner size without the condensate drain of a condensing unit.

$1,201.29