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Heat and water
Bosch Tankless Natural and LP Gas Water Heaters

Bosch on-demand tankless water heaters produce an endless supply of hot water —only when you need it. Some models are condensing units that recapture exhaust gas heat to preheat the cold water intake for maximum efficiency.

Models:
520 PN | 660 EF | Therm 830 ES | GWH C 800 ES | Therm C1210 ES
Therm C1210 ESC

Quick tip: click the links above to quickly jump to a specific model below on this page.


Bosch 520 PN non-condensing – special order only

Eternal Hybrid GU145 (S)
Up to 5.3 gallons per minute as 35º rise
Up to 78% energy factor
BTUH: 30,725 to 117,000
Push-button piezo ignition requires no electricity
15-year warranty on heat exchanger
36 3/4" height, 18 1/2" width, 10 1/2" depth
Qualifies for 30% federal tax credit
 

Bosch 660 EF non-condensing – special order only

Eternal Hybrid GU145 (S)
Up to 6.6 gallons per minute as 35º rise
Up to 82% energy factor
BTUH: 20,000 to 140,000
Electronic ignition
15-year warranty on heat exchanger
20 1/2" height, 14" width, 7" depth (super compact)
Qualifies for 30% federal tax credit
Mobil home approved
 

Bosch Therm 830 ES non-condensing

Eternal Hybrid GU145 (S)
Up to 8.3 gallons per minute as 35º rise
Up to 83% energy factor
BTUH: 19,900 to 175,000
Electronic ignition
15-year warranty on heat exchanger
31 1/2" height, 17 7/8" width, 11 1/4" depth
Qualifies for 30% federal tax credit
 

Bosch GWH C 800 ES condensing

Eternal Hybrid GU145 (S)
Condensing heat recapture for maximum efficiency
Up to 10.5 gallons per minute as 35º rise
Up to 91% energy factor
BTUH: 19,900 to 199,000
Electronic ignition
15-year warranty on heat exchanger
31 1/2" height, 17 7/8" width, 11 1/4" depth
Qualifies for 30% federal tax credit
 

Bosch Therm C 1210 ES condensing

Eternal Hybrid GU145 (S)
Condensing heat recapture for maximum efficiency
Up to 12.1 gallons per minute as 35º rise
Up to 94% energy factor
BTUH: 25,000 to 225,000
Electronic ignition
15-year warranty on heat exchanger
31 1/2" height, 17 7/8" width, 11 1/4" depth
Max. water temp.: 140 degrees
Qualifies for 30% federal tax credit
 

Bosch Therm C 1210 ESC condensing

Eternal Hybrid GU145 (S)
Condensing heat recapture for maximum efficiency
Up to 12.1 gallons per minute as 35º rise
Up to 94% energy factor
BTUH: 25,000 to 225,000
Electronic ignition
15-year warranty on heat exchanger
31 1/2" height, 17 7/8" width, 11 1/4" depth
Max. water temp.: 180 degrees (for commercial use)
Qualifies for 30% federal tax credit