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Bosch AquaStar Tankless Water Heaters
Models - 125FX, 125HX, 125BS (Solar), 125B, 125BL fueled by either Natural Gas or LP

Model 125 tankless instantaneous hot water heater fueled by Propane or Natural Gas Bosch AquaStar instantaneous gas tankless hot water heaters are the finest hot water heaters available. Choose either an on demand propane water heater or natural gas water heater in five different models to fill almost any need or single use application. For larger requirements - click here.

Endless Hot Water for 1 major application at a time
AquaStar 125 water Heaters can provide you with 1 major use at once AquaStar 125 water Heaters can provide you with 1 major use at once AquaStar 125 water Heaters can provide you with 1 major use at once AquaStar 125 water Heaters can provide you with 1 major use at once
Fill times for larger tubs and Jacuzzi tubs may be longer

Bosch AquaStar Model 125 FX

Built by Bosch, the Aqua Star 125 FX is the same great heater as the 125HX - but with a built in power vent. This model uses a standard plug for the power vent and electronic ignition. If you need an AquaStar and want to vent out through a side wall - then this is the heater for you! And just like the 125HX - the 125FX uses no energy when idle, the 125FX has an energy factor of .80 ­ the average storage tank heater has an energy factor of just .59. This instantaneous hot water tank is available in both gas tankless hot water heater and propane water heater.

Please Note: The Bosch Aquastar 125FX can only be vented horizontally - so it must be vented through an outside wall and requires an outside terminator (vent hood). Also the 125FX should have a back flow preventer for areas where temperatures fall below 32 degrees. See the link below for the optional FXHOOD. ZVent venting products will work with the AquaStar 125FX too (click here for this - use your back button to return to this page).



YOUR COST = $725.00
Bosch AquaStar tankless water heaters AquaStar Reconditioned 125FX on sale for $599.50 Special!

Add this AquaStar 125FX tankless water heater to your shopping cart - you can always remove it later

Aqua Star Model 125 HX

Robert Bosch, Inc., developed the 125HX patented hydro-generated ignition system that requires no standing pilot, electricity, or batteries. The Aquastar 125HX is the first tankless natural gas water heater to use this technology for pilot ignition. Hydro-generated ignition works much like the giant turbines in a hydroelectric dam using the flow of water to generate electricity. When a hot water tap is opened, cold water flows through the 125HX's hydro generator. The flowing water spins a tiny turbine, which, in turn, instantly produces electricity. This electricity creates the spark required to light the burners and the water is then heated as it passes through a copper heat exchanger. Choose the 125HX in either LP water heater or natural gas water heater.
This heater has been replaced by the new Bosch 1600H


This hydro-generated technology produces multiple important benefits:
  • Eliminates the need for any additional energy source. Only flowing water and gas are required
  • Uses energy only when you call for hot water - 82% efficiency
  • Eliminates worries about dead batteries and the need to constantly change batteries
  • Simplifies installation dramatically by eliminating the need for an electrical connection

YOUR COST = $599.00
Add this AquaStar 125 HX tankless water heater to your shopping cart - you can always remove it later

Aqua Star Model 125 B

The 125B is the right size model for most homes and is the ideal household water heater. It offers the same high performance of the 125HX, but has a standing pilot. This on demand instantaneous hot water tank is available in both natural gas and propane (LP).
This heater has been replaced by the new Bosch 1600P


YOUR COST = $499.00
Bosch AquaStar tankless water heaters AquaStar Reconditioned 125B on sale for $399.00 Special!

Add this AquaStar 125B tankless water heater to your shopping cart

Aqua Star Model 125 BO

The Bosch Aquastar 125BO Tankless Water Heater supplies one major hot water application at a time, such as a shower. Built for outdoor installation with built-in freeze protection down to 5°F. No venting needed. The 125BO is the outdoor version of the 125B. This on demand instantaneous hot water heater is available in both natural gas and propane (LP).


YOUR COST = $599.00
Bosch AquaStar 125BO tankless water heaters
AquaStar 125BO

Add this AquaStar 125BO tankless water heater to your shopping cart

Aqua Star Model 125 BL

This model is designed for recirculating to a storage (tank) system, for commercial water heating, and for hydronic and radiant space heating up to 140° F. This instantaneous hot water tank is available in both natural gas and propane (LP). See the links below for more info on this system before you make your purchase.


YOUR COST = $555.00
Add this AquaStar 125 BL tankless water heater to your shopping cart

Aqua Star Model 125 BS

Specifically designed as a backup to preheated water such as that produced by solar or wood heating systems. The burners turn off when the preheated water is already at the desired temperature. This instantaneous propane water heater or natural gas water heater is available in natural gas or propane (LP).

This heater has been replaced by the new Bosch 1600PS


YOUR COST = $599.00
Add this AquaStar 125 X tankless water heater to your shopping cart





ON SALE!
Bosch AquaStar Tankless Water Heaters Bosch AquaStar Reconditioned Water Heaters
ON SALE!
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