Bosch Greentherm (T9800 SEO 199)

Bosch Greentherm (T9800 SEO 199) is a gas tankless water heater from Bosch rated 5.4 GPM at a 0.95 UEF.

Efficiency
Uniform Energy Factor (UEF) 0.95
Annual gas use (natural gas) 178 therms/yr
Annual propane use 194.53 gal/yr
General
Fuel Natural Gas, Propane
Capacity
Max flow rate 5.4 GPM
Draw pattern High
Minimum activation flow 0.5 GPM
Performance
Gas input rate 199 kBTU/h
Installation
Max current draw 2.7 A
Vent type Direct Vent
Vent size 2
Smart features
Smart / connected capable No
Dimensions
Height 32 in
Width 19 in
Depth 10 in
Certification
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 199) 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) 5.4 GPM 2
55 °F Mild climate (~65 °F groundwater) 5.4 GPM 2
70 °F Cold climate (~50 °F groundwater) 5.4 GPM 2
77 °F DOE test condition 4.9 GPM 2

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Frequently asked questions

Is the Bosch Greentherm (T9800 SEO 199) ENERGY STAR certified?

Yes, the Bosch Greentherm (T9800 SEO 199) holds a current ENERGY STAR certification for water heating efficiency (UEF 0.95).

How much does the Bosch Greentherm (T9800 SEO 199) 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 199) use?

The Bosch Greentherm (T9800 SEO 199) 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 199) a smart water heater?

No, the Bosch Greentherm (T9800 SEO 199) is not connected-capable — it has no app connectivity or demand-response support.

Sources