Navien
Navien NPE-240A2
$2099Cheaper
Best Tankless Water Heaters · head-to-head
Navien NPE-240A2 vs Bosch Greentherm T9900i SE 199
A sourced, side-by-side comparison. Navien NPE-240A2 is cheaper at $2099. Every spec and price links to its source.
Bosch
Bosch Greentherm T9900i SE 199
$3583.27
Which is better: the Navien NPE-240A2 or Bosch Greentherm T9900i SE 199?
The Navien NPE-240A2 wins 1 of the 1 specs we compare head to head; the other wins 0. The Navien NPE-240A2 is the cheaper at $2099. The Navien NPE-240A2 both leads on specs and costs less — the straightforward pick.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec |  Navien NPE-240A2 |  Bosch Greentherm T9900i SE 199 |
|---|---|---|
| US price | $2099 | $3583.27 |
| Brand | Navien | Bosch |
| Released | — | — |
| Fuel type | natural-gas | natural-gas |
| Max flow rate (gpm) | 11.2 | 11.2 |
| Max btu per hour | 199900 | 199000 |
| Power input (kW) | — | — |
| Uniform energy factor | 0.95 | — |
| Condensing type | condensing | condensing |
| Min activation flow (gpm) | 0.5 | 0.45 |
| Vent type | pvc | pvc |
| Max temp (°F) | — | 140 |
| Heat exchanger warranty yrs | 15 | 15 |
| Wi-Fi enabled | No | Yes |
| Weight (lb) | 77 | 85 |
Sources — Navien NPE-240A2: navieninc.com (verified 2026-07-11). Bosch Greentherm T9900i SE 199: bosch-homecomfort.com (verified 2026-07-11).
What's the difference between the Navien NPE-240A2 and Bosch Greentherm T9900i SE 199?
Where the two actually differ on the specs we track (4 of 12). Matching specs are omitted.
- Max btu per hour: Navien NPE-240A2 199900 vs Bosch Greentherm T9900i SE 199 199000
- Min activation flow (gpm): Navien NPE-240A2 0.5 vs Bosch Greentherm T9900i SE 199 0.45
- Wi-Fi enabled: Navien NPE-240A2 false vs Bosch Greentherm T9900i SE 199 true
- Weight (lb): Navien NPE-240A2 77 vs Bosch Greentherm T9900i SE 199 85