Bosch AquaStar 125 Series Tankless Water Heater
Bosch AquaStar 125 Series
Bosch's AquaStar 125 series of tankless water heaters are intended for light residential or small business use. Each AquaStar heater is meant to replace a 40-gallon tank heater and supply hot water to a single major water outlet at a time, such as a shower or a dishwasher. The maximum flow rate for the AquaStar 125 series is 4 gallons per minute at a degree rise of 45 degrees Fahrenheit, and the manufacturer recommends a water pressure between 30 and 15o psi.
"I installed a Bosch Aquastar 125B that burns natural gas. I have had it two years and it already paid for itself. What I like about the unit: Installation was easy. The unit is small, lightweight and constructed well of high quality materials. Can be mounted on a wall to free up valuable space. You have an endless supply of hot water. I am able to run my washer and shower at the same time with no problems. My natural gas usage is less than 2/3 of what it was with the tank water heater. Saves money. Has a very small pilot that can be turned off if you go on vacation or whatever and can be easily re-ignited with the press of a button. What I don't like about the unit: Requires a 5" vent pipe. Unable to run a trickle of warm water. While the initial investment seems high, the unit has paid for itself. The good points such as energy savings and money savings definitely outweigh any negative aspects of the water heater. I hope that this information is helpful for anyone who may be considering the purchase of such a water heater." ConsumerReports.org Reader Joe V.
Besides the basic 125B model, the AquaStar 125 series includes the AquaStar 125BO, which is intended for outdoor mounting. It has freeze protection down to 5 degrees Fahrenheit. Also in the series are the AquaStar 125FX, which incorporates a power vent for horizontal and sidewall venting, and the 125HX, which uses the flow of water to provide the energy for ignition and so requires neither a gas pilot light or an electric igniter, saving even more on energy. All models in the 125 series can use either natural gas or liquid propane.
While the AquaStar 125 series does not have an EnergyStar certification, Bosch estimates the energy savings for using one to be between $100 and $200 a year, compared to tank heaters. The AquaStar 125 series has an energy efficiency of 82% (80% for the 125FX).
The AquaStar 125 series is designed with durability and ease of maintenance in mind. The internal parts that transmit the water are either solid copper or solid plastic, and all of these can be replaced and/or recycled, making it easy to keep your heater going even after parts wear out. The exterior casing is made of stainless steel and aluminum, with a baked epoxy finish; the burners are also stainless steel.
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