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

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

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

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

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

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

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