Bosch Greentherm (T9800 SEO 160)
Bosch Greentherm (T9800 SEO 160) is a gas tankless water heater from Bosch rated 4.6 GPM at a 0.95 UEF.
| Uniform Energy Factor (UEF) | 0.95 |
|---|---|
| Annual gas use (natural gas) | 178 therms/yr |
| Annual propane use | 194.53 gal/yr |
| Fuel | Natural Gas, Propane |
|---|
| Max flow rate | 4.6 GPM |
|---|---|
| Draw pattern | High |
| Minimum activation flow | 0.5 GPM |
| Gas input rate | 160 kBTU/h |
|---|
| Max current draw | 2.7 A |
|---|---|
| Vent type | Direct Vent |
| Vent size | 2 |
| Smart / connected capable | No |
|---|
| Height | 32 in |
|---|---|
| Width | 19 in |
| Depth | 10 in |
| ENERGY STAR certified | Yes |
|---|
Real flow rate by climate
A tankless heater's usable flow depends on how far it must raise incoming water temperature. Sustained hot-water flow of the Bosch Greentherm (T9800 SEO 160) at common temperature rises (a typical shower uses about 2 GPM of mixed water):
| Temperature rise | Climate | Sustained flow | Simultaneous showers |
|---|---|---|---|
| 45 °F | Warm climate (~75 °F groundwater) | 4.6 GPM | 2 |
| 55 °F | Mild climate (~65 °F groundwater) | 4.6 GPM | 2 |
| 70 °F | Cold climate (~50 °F groundwater) | 4.3 GPM | 2 |
| 77 °F | DOE test condition | 3.9 GPM | 1 |
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Frequently asked questions
Is the Bosch Greentherm (T9800 SEO 160) ENERGY STAR certified?
Yes, the Bosch Greentherm (T9800 SEO 160) holds a current ENERGY STAR certification for water heating efficiency (UEF 0.95).
How much does the Bosch Greentherm (T9800 SEO 160) cost to run per year?
About $258 per year at national average energy rates, based on its certified annual energy use under the DOE test draw pattern. Your rate and usage change this figure.
What venting does the Bosch Greentherm (T9800 SEO 160) use?
The Bosch Greentherm (T9800 SEO 160) uses Direct Vent venting with 2 in vent connections. Matching the existing vent type is usually the cheapest replacement path.
Is the Bosch Greentherm (T9800 SEO 160) a smart water heater?
No, the Bosch Greentherm (T9800 SEO 160) is not connected-capable — it has no app connectivity or demand-response support.
Sources
- data.energystar.gov (retrieved 2026-07-17)