Need help?
Discontinued Gas Tankless Water Heaters
Therm C1210 ES/EC for S/N 212 & lower |
Therm C1050 ES for S/N 202-212 |
Therm C1050 ES for S/N 201 & lower |
Therm C950 ES for S/N 202-212 |
Therm C950 ES for S/N 201 & lower |
Therm C940 ES for S/N 202-212 |
Therm C940 ES for S/N 201 & lower |
Therm 940 ESO |
Therm 940 ESO |
Therm 940ESO for S/N 202-212 |
Therm 940ESO for S/N 201 & lower |
Therm 830ES for S/N 202-212 |
Therm 830ES for S/N 201 & lower |
Therm 660 EF/EFO |
Therm 660 EF/EFO - Spanish |
Therm 660 EF/EFO - French |
Therm 660 EF/EFO |
Therm 660 EF |
Therm 660 EFO |
Therm 520 PN |
Therm 330 PN |
Therm 520 HN |
GWH C 920 ES/ESC |
GWH 715 ES High Altitude |
GWH 800 ES High Altitude |
GWH 635 ES |
GWH 450 ES |
GWH 345/450 ESR |
GWH 425 HN - S/N 686 & Higher |
GWH 425 HN - S/N 685 & Lower |
GWH 425 HN - Spanish |
GWH 425 HN - French |
GWH 425 HNO |
GWH 425 EF |
GWH 425 PN |
GWH 425 PN - French |
GWH 425 PN - Spanish |
GWH 260 PN |
Pipe Cover |
GWH 345/450 ESC |
Tankless & Point of Use |
Cascading Kit |
AQ1 Power Vent Kit for GWH 425 HN S/N 685 & Lower |
AQ4 Horizontal Vent Kit for GWH 425 HN S/N 686 & Higher |
Stainless Steel Concentric Venting |
PVC Concentric Venting |
Pro Tankless Outdoor Kit |
Therm 660 EF/EFP Gas Conversion |
Therm EF/EFO Pipe Cover |
Therm 660/EFO Recess Box |
Therm Water Filter Kit |
520 HN / GWH 425 HN |
Bosch GWH Tankless Models
GWH 2700 ES |
GWH 2400 ES |
GWH 1600 P |
GWH 1600 PS |
GWH 1600 H |
GWH 1000 P |
AQ3 Z-Vent (Z-Flex SVE Series III) |
3" Vent Kit-GWH 2700 ES, GWH 2400 ES |
AQ4 Vent Kit-GWH 1600P, GWO 1600H |
AQOK Outdoor Kit-GWH 2700 ES, GWH 2400 ES |
Bosch AquaStar Models
38B |
125B (Newer one port) |
125B (Older two port) |
125BL |
125BO |
125BS |
125FX |
125FX (older one port) |
125FX (older two port) |
125HX |
125HX (older one port) |
125HX (older two port) |
125X |
80VP |
125VP |
170VP |
240FX |
250 SX |
250 SXO |
250 SX Z-Vent |
2400E |
2400EO |
AQ-1 Power Vent Kit |
Ecotherm |

Determining the elevation limit of your 345/450 ESR or 715/C 800 ES
- FD Code 886 or lower - unit approved for elevations up to 4,500'
- FD Code 887-891 - NG unit approved for elevations up to 8,000'
- FD Code 887-891 - LP unit approved for elevations up to 4,500'
- FD Code 892 or higher - LP and NG units approved for elevations up to 8,000'