Both are condensing tankless water heaters. Efficiency is nearly identical. The T-H3J-OS-N-1 saves $8/year to operate. All figures from published specs and EIA energy prices.
Performance
| Spec | RTGH-95DVLN-3 Rheem · Condensing Tankless | T-H3J-OS-N-1 Takagi · Condensing Tankless |
|---|---|---|
| UEF | 0.93 | 0.95Difference: 0.02 |
| Max Flow Rate | 9.50 GPMDifference: 4.80 GPM | 4.70 GPM |
| BTU Input | 199,900Difference: 39,900 | 160,000 |
But does it fit? Sizing guide
Physical dimensions
| Dimension | RTGH-95DVLN-3 | T-H3J-OS-N-1 |
|---|---|---|
| Height | 23" | 22.50"Difference: 0.50" |
| Width | 18" | 17.75"Difference: 0.25" |
| Depth | 9"Difference: 1.75" | 10.75" |
| Weight | 53 lbsDifference: 5 lbs | 58 lbs |
Fit checked. Now the operating cost.
Operating cost
| Cost | RTGH-95DVLN-3 | T-H3J-OS-N-1 |
|---|---|---|
| Annual Operating Cost | $250/yr | $242/yrDifference: $8/yr |
| 10-Year Operating Cost | $2,500 | $2,420Difference: $80 |
| Annual Energy | 184 therms | 178 thermsDifference: 6 therms |
10-year modeled difference is $80. At this scale, local energy rates, usage patterns, and install costs matter more than the efficiency delta.
Costs vary by state. The RTGH-95DVLN-3 ranges from $121/yr (ID) to $918/yr (HI). The T-H3J-OS-N-1 ranges from $117/yr (ID) to $888/yr (HI).
$8/yr separates them. Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | RTGH-95DVLN-3 | T-H3J-OS-N-1 |
|---|---|---|
| Voltage | 120Videntical | |
| Amperage | — | 5A |
| Vent Type | — | Power Vent |
| Vent Material | Category Iv Pvc Cpvcidentical | |
| Condensate Drain | Yesidentical | |
Same electrical requirements. Swapping between these units should not require electrical changes.
Warranty
| Coverage | RTGH-95DVLN-3 | T-H3J-OS-N-1 |
|---|---|---|
| Heat Exchanger | 15 yridentical | |
| Parts | 5 yridentical | |
| Labor | 1 yr | — |
Features
| Feature | RTGH-95DVLN-3 | T-H3J-OS-N-1 |
|---|---|---|
| Wi-Fi / Smart | No | — |
| Recirculation Ready | Yes | — |
Decision split
Pick this one if...
Rheem RTGH-95DVLN-3
- You need higher flow (9.50 GPM)
Neither if...
- You have no floor drain and cannot add condensate handling
Common accessories for this type of installation.
Common install considerations for gas tankless units
What is required depends on your existing installation, local code, and installer preference.
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Related
Sources. ENERGY STAR, manufacturer spec sheets, EIA average energy prices.Methodology