6.9
Rinnai
Rinnai RU199iN Tankless Water Heater
The Rinnai RU Series Sensei SE+ Tankless Hot Water Heater is a highly efficient, space-saving solution, particularly suitable for indoor use. Its high thermal efficiency and reduced gas consumption make it an excellent long-term investment. However, the need for additional components like a recirculating pump and WiFi module could add to the initial setup cost. If convenience and efficiency are your primary concerns, this model is well worth considering.
Model: RU199iNColor: RU199in - Natural Gas/11 GPMUPC: 766156009532
Lowest at Amazon
$1,854.74 at AmazonLowest at any Popular Retailer
$1,854.74 at AmazonWhere to Buy
Prices last updated: April 28th 2026 10:04 am
Product Score
Based on professional reviews and customer feedback
6.9/10
Overall
6.9
Consumer
Why this score?
The Rinnai RU Series Sensei SE+ Tankless Hot Water Heater receives a moderate score due to its strong performance in providing continuous hot water and energy efficiency, as highlighted by users praising its effectiveness for multiple simultaneous uses. However, issues regarding inconsistent heating, high installation costs, and potential design flaws have led to dissatisfaction among several customers, indicating concerns about reliability and value for the investment.
8+ Excellent6-8 Good4-6 Average<4 Poor
Score
The Rinnai RU Series Sensei SE+ Tankless Hot Water Heater receives a moderate score due to its strong performance in providing continuous hot water and energy efficiency, as highlighted by users praising its effectiveness for multiple simultaneous uses. However, issues regarding inconsistent heating, high installation costs, and potential design flaws have led to dissatisfaction among several customers, indicating concerns about reliability and value for the investment.
6.9/10
Overall
Pros
- •High thermal efficiency at 98%
- •Significant gas usage reduction (50%) compared to tank models
- •Provides a continuous flow of hot water with up to 9.8 GPM
- •Indoor installation saves space compared to traditional water heaters
Cons
- •Requires a recirculating pump to function optimally
- •Needs a WiFi module for full functionality, which may be an additional purchase
- •Installation may require professional assistance due to venting and gas supply requirements
Bottom Line
The Rinnai RU Series Sensei SE+ Tankless Hot Water Heater is a highly efficient, space-saving solution, particularly suitable for indoor use. Its high thermal efficiency and reduced gas consumption make it an excellent long-term investment. However, the need for additional components like a recirculating pump and WiFi module could add to the initial setup cost. If convenience and efficiency are your primary concerns, this model is well worth considering.
What Reviewers Are Saying
Praised
install process was easy14%
endless hot water10%
great support5%
user-friendly installation5%
Criticized
no hot water14%
faulty product10%
need extra equipment10%
leaking issues10%
less hot than expected5%
Customer Ratings
4.5872 reviews
5
80%
4
10%
3
2%
2
1%
1
7%
Based on 872 reviews from Amazon
Professional Reviews
Common Questions
The Rinnai RU199iN tankless water heater can heat water up to 140°F (60°C), which is typical for most residential needs like showers, dishwashing, and laundry, according to our research. This heater i...
Read full answer📚More About Rinnai RU199iN Tankless Water Heater
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TLDR Review: Rinnai RU199iN Tankless Water Heater
The Rinnai RU Series Sensei SE+ Tankless Hot Water Heater receives a moderate score due to its strong performance in providing continuous hot water and energy efficiency, as highlighted by users praising its effectiveness for multiple simultaneous uses. However, issues regarding inconsistent heating, high installation costs, and potential design flaws have led to dissatisfaction among several customers, indicating concerns about reliability and value for the investment.
TLDR Review·1 years ago
6.9
Overall
💧
What is the maximum temperature of the Rinnai RU199iN tankless water heater?
Q&A·1 years ago
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How long does it take for the Rinnai RU199iN to heat water?
Q&A·1 years ago
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Does the Rinnai RU199iN have a built-in recirculating pump?
Q&A·1 years ago
Discussion
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