Rinnai Sensei RX199i
#1 in GasFull review
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.
Amazon $1,532.79$1,532.79
The Rinnai Sensei RX199i is the better tankless water heater overall, rated 4.3 to 4.0. The Rinnai Sensei RX199i leads on efficiency. The Rinnai RE199i wins on value. The Rinnai RE199i costs $252 less ($1,280.79 vs $1,532.79).
Rinnai RE199i
#10 in GasFull review
A dependable whole home heater for buyers who want Rinnai power at a lower price than a condensing model and have room for metal venting.
Amazon $1,280.79 Amazon $1,412.82$1,280.79
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Rinnai Sensei RX199i for efficiency (0.98 UEF vs 0.82 UEF).
- Choose the Rinnai RE199i for value ($6.44 per 1,000 BTU/h ($1,280.79, 199,000 BTU/h) vs $7.70 per 1,000 BTU/h ($1,532.79, 199,000 BTU/h)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every gas tankless water heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Rinnai Sensei RX199i | Rinnai RE199i |
|---|---|---|
| Overall rating | 4.3/5 | 4.0/5 |
| Value 35% | 40 $7.70 per 1,000 BTU/h ($1,532.79, 199,000 BTU/h) | 57 $6.44 per 1,000 BTU/h ($1,280.79, 199,000 BTU/h) |
| Heating power 25% | 100 199,000 BTU/h | 100 199,000 BTU/h |
| Efficiency 15% | 100 0.98 UEF | 12 0.82 UEF |
| Warranty 25% | 100 15-year heat exchanger warranty | 100 15-year heat exchanger warranty |
Specifications
| Rinnai Sensei RX199i | Rinnai RE199i | |
|---|---|---|
| Heating | ||
| Fuel | Gas | Gas |
| Gas type | Natural gas or propane | Natural gas or propane |
| Gas input | 15,000 to 199,000 BTU/h | 10,400 to 199,000 BTU/h |
| Max flow | 11 GPM | 9.8 GPM |
| UEF | 0.98 | 0.82 |
| Condensing | Yes | No |
| ENERGY STAR | Yes | No |
| Installation | ||
| Venting | Both | Indoor |
| Vent type | 2 in or 3 in PVC/CPVC/PP, or concentric | 3 in x 5 in concentric |
| Weight | 55 lb | 42.1 lb |
| Features | ||
| Built-in recirculation | No | No |
| Wi-Fi | No | No |
| Heat exchanger warranty | 15 years | 15 years |
| Parts warranty | 5 years | 5 years |