Rinnai Condensing Verses Navien Condensing
These are the two heavy hitters in the high efficiency Tankless water heater field. How can you choose the correct tankless, well this article aims to help you choose between the Rinnai Tankless or the Navien Tankless.
| Brand | Rinnai | Navien | Rinnai | Navien |
| Model Nuber | RC98HP | NR240 | RC80HP | NR180 |
| Dimension | 19Wx26Hx11D | 17Wx28Hx15D | 19Wx26Hx11D | 17Wx28Hx14D |
| Weight | 71 lbs | 77 lbs | 64 lbs | 67 lbs |
| Activation Rate (GPM) | 0.4 | 0.5 | 0.4 | 0.5 |
| Min. Input (BTUs,NG) | 9,500 | 17,000 | 9,500 | 15,000 |
| Max. Input (BTUs,NG) | 199,000 | 199,000 | 157,000 | 150,000 |
| GPM @ 77 Rise | 5.0 | 5.0 | 4.0 | 3.8 |
| Thermal Efficiency | 96% | 98% | 97% | 98.8% |
| Energy Factor | 0.94 | 0.97 | 0.95 | 0.96 |
| Type of Venting | Concentric PP | Two Pipe PVC | Concentric PP | Two Pipe PVC |
This chart pits the two main tankless systems that each manufacturer produces, the only row it is missing is reliability. Unfortunately we dont have any scientific data on that but would venture to say that the Rinnai makes the more dependable tankless. This is solely based on comments that we receive here on the site regarding the two tankless manufacturers.
November 15, 2010
Really? your argument is based on 0.1 of a Gallon difference. When the Navien brakes down and cant produce hot water I bet the Rinnai catches up pretty quick.
November 14, 2010
The two larger units are in correct
You rounded up the Rinnai and rounded down the Navien, so I guess your Pro Rinnai?
77 degree rise is the industry standard, so it’s input x efficiency divided by weight of 1 gal, divided by 60 (min in an hour) divided by temp rise
199,000 x .96 / 8.33 / 60 / 77 = 4.96 GPM @ 77 degree rise on Rinnai
199,000 x .98 / 8.33 / 60 / 77 = 5.06 GPM @ 77 degree rise on the Navien