Bosch
Bosch Greentherm T9900i SE 199
$3583.27
Best Tankless Water Heaters · head-to-head
Bosch Greentherm T9900i SE 199 vs EcoSmart ECO 24
A sourced, side-by-side comparison. EcoSmart ECO 24 is cheaper at $525. Every spec and price links to its source.
EcoSmart
EcoSmart ECO 24
$525Cheaper
Which is better: the Bosch Greentherm T9900i SE 199 or EcoSmart ECO 24?
The EcoSmart ECO 24 wins 1 of the 1 specs we compare head to head; the other wins 0. The EcoSmart ECO 24 is the cheaper at $525. The EcoSmart ECO 24 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 |  Bosch Greentherm T9900i SE 199 |  EcoSmart ECO 24 |
|---|---|---|
| US price | $3583.27 | $525 |
| Brand | Bosch | EcoSmart |
| Released | — | — |
| Fuel type | natural-gas | electric |
| Max flow rate (gpm) | 11.2 | — |
| Max btu per hour | 199000 | — |
| Power input (kW) | — | 24 |
| Uniform energy factor | — | — |
| Condensing type | condensing | electric |
| Min activation flow (gpm) | 0.45 | 0.3 |
| Vent type | pvc | none |
| Max temp (°F) | 140 | 140 |
| Heat exchanger warranty yrs | 15 | — |
| Wi-Fi enabled | Yes | No |
| Weight (lb) | 85 | 14.25 |
Sources — Bosch Greentherm T9900i SE 199: bosch-homecomfort.com (verified 2026-07-11). EcoSmart ECO 24: ecosmartus.com (verified 2026-07-11).
What's the difference between the Bosch Greentherm T9900i SE 199 and EcoSmart ECO 24?
Where the two actually differ on the specs we track (6 of 12). Matching specs are omitted.
- Fuel type: Bosch Greentherm T9900i SE 199 natural-gas vs EcoSmart ECO 24 electric
- Condensing type: Bosch Greentherm T9900i SE 199 condensing vs EcoSmart ECO 24 electric
- Min activation flow (gpm): Bosch Greentherm T9900i SE 199 0.45 vs EcoSmart ECO 24 0.3
- Vent type: Bosch Greentherm T9900i SE 199 pvc vs EcoSmart ECO 24 none
- Wi-Fi enabled: Bosch Greentherm T9900i SE 199 true vs EcoSmart ECO 24 false
- Weight (lb): Bosch Greentherm T9900i SE 199 85 vs EcoSmart ECO 24 14.25