Navien
Rinnai
Navien vs Rinnai
Expert head-to-head boiler comparison by Nassau County installers with 35+ years of combined experience.
Head-to-Head Scorecard
Navien
2 wins
Rinnai
0 wins
Navien leads overall
Performance Score Rings
Navien
mid-rangeTop Strengths
- Two current combi families
- 95% AFUE researched residential families
- Heating-only alternatives
Watch Out For
- No steam boiler in researched lineup
- Combi must meet heating and hot-water loads
Rinnai
mid-rangeTop Strengths
- Same-day parts locally
- i-Series combi for Cape Cods
- PSEG rebate eligible
Watch Out For
- Annual descaling essential
- Surge protector recommended
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Expert Verdict
Both are excellent condensing boiler brands. Navien leads in combi boilers; Rinnai excels in tankless water heating crossover. Choose by your specific application.
Pick Navien when…
You want the best combi boiler with integrated domestic hot water and WiFi-enabled NaviLink control.
Full Navien reviewPick Rinnai when…
You want a brand known for tankless water heating excellence and need a boiler from the same trusted ecosystem.
Full Rinnai reviewCategory-by-Category Breakdown
Click any category to see why one brand wins.
Full Specification Comparison
| Spec | Navien | Rinnai |
|---|---|---|
| Overall Rating |
4.75/5
|
4.05/5
|
| Price Range (Installed) |
$3.5k – $8.0k
|
$3.2k – $7.5k
|
| AFUE Range |
95–95%
|
95–96%
|
| Parts Warranty |
5 years on researched current residential series
|
5 years
|
| Heat Exchanger Warranty |
10 years combi; heating-only varies by series
|
12 years
|
| Founded |
1978
|
1920
|
| Country |
South Korea
|
Japan
|
| Parent Company |
KD Navien
|
Rinnai Corporation
|
Warranty Comparison Timeline
* All warranties shown assume product registration. Unregistered units typically receive 5-year coverage.
Visual Comparison
Pros & Cons
Navien
Strengths
- Two current combi families
- 95% AFUE researched residential families
- Heating-only alternatives
- Published series warranties
Weaknesses
- No steam boiler in researched lineup
- Combi must meet heating and hot-water loads
- Some exchanger terms are prorated
- Check local parts and service
Rinnai
Strengths
- Same-day parts locally
- i-Series combi for Cape Cods
- PSEG rebate eligible
- WiFi Control-R app
- Proven tankless heritage
Weaknesses
- Annual descaling essential
- Surge protector recommended
- Combi limited to 1-2 bath homes
Need Help Choosing Between Navien and Rinnai?
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Long Island Installation Guide
Long Island Installation Guide
Both brands are strong choices for Long Island homeowners switching from oil to gas. Navien dominates the combi boiler segment while Rinnai is the go-to for combined tankless water heater and boiler installations. Parts availability is excellent for both through local distributors.
Climate Zone 4A
Coastal Salt Air
PSEG Rebates
Customer Reviews
❓Navien vs Rinnai FAQ
Is Navien or Rinnai better for Long Island homes?
Both are excellent condensing boiler brands. Navien leads in combi boilers; Rinnai excels in tankless water heating crossover. Choose by your specific application.
Which is cheaper to install in Nassau County, Navien or Rinnai?
Navien ranges from $3.5k – $8.0k installed, while Rinnai ranges from $3.2k – $7.5k installed in Nassau County.
Are Navien and Rinnai made by the same company?
No. Navien is made by KD Navien, while Rinnai is made by Rinnai Corporation.
What warranty does Navien offer vs Rinnai?
Navien offers 5 years on researched current residential series parts warranty and 10 years combi; heating-only varies by series heat exchanger warranty. Rinnai offers 5 years parts warranty and 12 years heat exchanger warranty.
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