Rinnai E-Series
Model Number: ESER
Reliable heat-only condensing boiler from tankless leader.
Technical Specifications
Prices depend on sizing, venting and piping in your home, so we quote every installation.
Sizing: the right size comes from a room-by-room heat-loss calculation, not the size of the old boiler or a rule of thumb. Oversized boilers short-cycle and waste fuel; steam systems are sized to the connected radiation instead. See how we approach boiler installation.
Home-Specific Operating Cost Review
No guaranteed annual savings or payback period
Historical Use
Fuel consumption and weather
Current Rates
Utility and delivered-fuel prices
System Design
Load, piping, controls, and temperatures
Full Specifications
- Model Number
- ESER
- Efficiency (AFUE)
- 95%
- Boiler Type
- Condensing Boiler
- BTU Input Range
- 60k - 199k BTU
- In Production
- Yes
- Parts Warranty
- 5 years
- Heat Exchanger Warranty
- 12 years
Specification source not yet linked — figures are being verified against manufacturer data.
Ideal For
Homes with existing water heater
Expert Review: Rinnai E-Series
The Rinnai E-Series delivers Japanese engineering in a reliable condensing boiler. At 95% AFUE, this wall-mounted unit qualifies for PSEG Long Island rebates while providing excellent efficiency. Rinnai's reputation for tankless water heaters extends to their heating products.
Compact wall-mount design saves floor space. Japanese manufacturing ensures precision engineering and reliability.
Our recommendation: The E-Series is ideal for homeowners familiar with Rinnai quality from their water heater line wanting the same reliability in heating.
Key Features & Technology
Heat-only condensing
Modulating burner
Outdoor reset
Compact design
Proven reliability
Advantages
- Good value heat-only option
- Strong parts network
- Rinnai reliability
- PSEG rebate eligible
Considerations
- Annual descaling required
- No DHW capability
- Surge protection recommended
Sizing & Installation Notes
Condensing boilers like the E-Series reach their rated efficiency only when return water runs cool enough to condense flue gases. We check your radiation and design water temperatures so the unit actually condenses in your home, not just on the spec sheet.
Every Rinnai installation starts with a free in-home assessment covering the heat-loss calculation, venting and chimney condition, gas or oil supply sizing, and permit requirements for your town. Learn more about our boiler installation process, or see current rebate and incentive programs that may apply.
Warranty & Protection
Parts Warranty
5 years
Heat Exchanger
12 years
Our Guarantee
100% Satisfaction
All Rinnai boiler installations by Home+ Air & Heat include our 1-year workmanship warranty, covering labor and any installation-related issues.
Compare the Rinnai Lineup
| Model | Efficiency | BTU Range | Fuel | Heat Exchanger Warranty |
|---|---|---|---|---|
| E-Series (this model) | 95% AFUE | 60k - 199k BTU | — | 12 years |
| i-Series Combi | 96% AFUE | 60k - 120k BTU | — | 12 years |
| M-Series | 95% AFUE | 60k - 175k BTU | — | 12 years |
See the full Rinnai brand page for lineup context, or browse the Best Condensing Boilers guide to compare across brands.
Frequently Asked Questions
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