Robert Bosch is the developer of the 1600H gas tankless water heater model which has no need for electricity, because it has a hydro generated ignition. This new technology uses water to generate energy, that’s why there is no need for electricity on this model. When you turn the hot water on, cold water runs trough the heater (trough the hydro generator first), and electricity is being produced fast and is used to ignite the burners. Then, the cold water passes through the heat exchanger and voila: you now have hot water.
The average efficiency for this model is somewhere around 78%. The minimum flow rate is 0.5 gallons per minute. The highest temperature rise it can achieve is 90°F at a flow rate of 2.1 gallons per minute. The second best temperature rise of 77°F is achieved at a flow rate of 2.4 gallons per minute. At a flow rate of 2.9 gallons per minute, the temperature rise of the water is 65°F. The temperature rise of 55°F is achieved at a flow rate of 3.4 gallons per minute. At the flow rate of 4.3 gallons per minute the temperature rise is 45°F.
This model is easier to install than regular models, because all you have to supply it with is water and gas or propane. It doesn’t need electricity. The size of the vent is 5 and should be vertical. The gas connection type for this model is 3/4 Male NPT. The water connection type is 1/2 Male NPT. The lowest gas pressure for the 1600H should be 7 WC and the highest 14 WC. The propane pressure should be as low as 11 WC but not higher than 14 WC. Finally, the water pressure should be somewhere between 30 PSI and 150 PSI.
The 1600H Aquastar comes as a replacement to the to the 125HX model. The price for this model is somewhere around $600. It is designed to supply one major application with endless hot water. You can also choose whether you want this model on gas or on propane. The warranty on this product is 12 years for the heat exchanger, if the heater is used only for a single family home, if not the warranty is for 2 years. For all the other parts you get a 2 year warranty.
If you need hot water for a major single appliance, then this is the product for you. It is easy to install and can be very efficient.