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Bosch AquaStar Tankless Water Heaters FAQ'S
General and Specific information on Bosch AquaStar tankless water heaters. If you do not find the info on this page to answer to questions - please try the on-line installions manuals or hit the "Contact Us" button and ask our experts.

Please select the topic below or just page through this page to see all the topics. Information referred to on this Bosch Aquastar FAQ page can be found in more detail on specific product pages. If you need anymore information - please hit the "contact us" button on the top of this page and ask our experts.

How much money can I save with a gas tankless water heater?
Why does a Bosch AquaStar tankless water heater cost more than a storage tank?
How can I size a gas tankless water heater for my application?
Are the Bosch AquaStars tankless water heaters approved for mobile homes?

How much will an installation cost of a tankless water heater?
Can gas tankless water heaters be installed anywhere?
Who would install the gas tankless water heaters?
What are the venting and combustion air requirements for gas tankless water heaters?
How much hot water can I get at any one time?
How many gallons per minute (gpm) are used by a shower, a sink, a bathtub, etc...?
What water temperatures are common in a home?
What happens when I increase or decrease the flow rate?
Are there limits to the flow rates?
What happens if two big draws (for example shower + washing machine) are running at the same time using an AquaStar?
What do you mean by endless hot water?
What is the average ground water temperature and why does it matter?
How can the tankless water heater heat water instantly?

How long will the Bosch AquaStar Tankless Water Heater last?
What kind of service do tankless water heaters require?
How will hard water affect my Bosch AquaStar gas tankless water heater?
What is the warranty?

If these units are superior to tanks, why haven't I heard about them before?
Does TanklessWaterHeatersDirect.Com sell a tankless electric hot water heater?


  • How much money can I save with a gas tankless water heater?

  • You can save between $100.00 and $400.00 dollars a year (up to 50%), depending on whether you are comparing your savings to a natural gas, propane or electric storage tank. Bosch Aquastar tankless water heaters without pilots will save approximately $40 per year more. Savings also depend on usage, so keep in mind that with the benefit of endless hot water, your showers might get longer.

  • Why does an Bosch AquaStar Tankless Water Heater cost more than a storage tank?

  • The Bosch AquaStar is manufactured with materials that will last a lifetime: copper, brass and stainless steel. The engineering and manufacturing of a tankless gas water heater is much more sophisticated than that for making storage tank water heaters. For example, the Bosch AquaStar gas control modulates the burner energy output according to the hot water flow demand. Keep in mind, too, that you should not be buying another water heater for 20 years or more, and that you will not need to buy extra strapping, mounting, drip pans or leak detectors.

  • How can I size a gas tankless water heater for my application?

  • The AquaStar model 1600 / 125 series can replace the conventional storage tank in a home. There is a smaller AquaStar model available for camps and cabins (1000P / 38B), and the Bosch 2400E, Bosch 2400ES, Bosch 2400EO, and Bosch 2700ES - larger on demand model available for simultaneous demands, like two showers at once. Check each heater page for what each tankless water heater can do for you. Make sure you choose the right heater for your application. If you have any questions - please hit the "contact us" button at the top of most pages and ask our experts. We are here to help you find the perfect hot water heater for your needs.

  • Are the Bosch AquaStars tankless water heaters approved for mobile homes?

  • No. However, PowerStar and PowerStream instant electric water heaters can be used in mobile homes.

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INSTALLATION:

  • How much will an installation tankless water heater cost?

  • A simple installation should take less than three hours. Tankless water heaters require 1/2 inch or 3/4 inch gas lines (depending on size), so if a larger gas supply line is required, the time (hence, cost) will be more.
    Venting work can also cause the installation cost to increase. The Bosch AquaStar 1600 / 125 series requires a minimun 5 inch vent, so masonry work may be required. The units can also be power vented through 4-inch vents, making retrofits into existing exhaust systems less costly. Check out the power vent accessory on the AquaStar 125 lineup page.

  • Can gas tankless water heaters be installed anywhere?

  • tankless water heaters cannot be installed inside of bathrooms or bedrooms or in mobile homes, recreational vehicles or boats. Closets are fine as long as adequate air supply is present.

  • Who would install the gas tankless water heater?

  • A licensed plumber or a licensed gas technician would be able to install an AquaStar Tankless Water Heater. The connections at the heater are standard 1/2 inch AquaStar 1600 / 125 Series and 3/4 inch for Bosch 2400ES, 2700ESfor water and gas lines.

  • What are the venting and combustion air requirements?

  • Venting and combustion air requirements for each unit are located on the Tech Support pages on the AquaStar 125 lineup page.

  • How much hot water can I get at any one time?

  • On Demand Tankless water heaters are rated by gallons per minute (gpm) at specific degree rises. Check the specifications for any given model. For example, the AquaStar 1600P will produce 3.5 gallons per minute (gpm) at a 50 degree rise. This means you would have 105F water at 3.5 gpm (50-degree rise to inlet water temperature of 55F. This is plenty for a good shower and simultaneous hand washing at a sink. The flow rate is the same as 210 gallons per hour at a shower temperature.

  • How many gallons per minute (gpm) are used by a shower, a sink, a bathtub, etc...?

  • As stated by the Department of Energy: shower = 2.5 gpm; sink = .5 to 1.5 gpm; washing machine = 2 gpm; dishwasher = 2 gpm. A bathtub that holds 30 gallons of water will take about 10 minutes to fill.

  • What water temperatures are common in a home?

  • Hand washing is comfortable at 110F. Showers and baths are safe around 104F.

  • What happens when I increase or decrease the flow rate?

  • Bosch AquaStars have a modulating gas valve, so accordingly the burner flames will increase and decrease in order to keep the temperature steady. AquaStar tankless water heaters modulate by flow, so that the gas burners activate according to the volume of water flowing through the heater. Therefore, the temperatures will not vary when flow is increased or decreased at the faucet.

  • Are there limits to the flow rates?

  • Yes. When the Bosch AquaStar tankless water heater is set to activate at 0.5 gpm for the 125 / 1600 Series hot water Heaters, and the maximum flow rate is 4.0 gpm (depending on model). At this setting, the temperature rise will be 90F (giving 140F water). Adding cold water produces higher flow rates. The AquaStar can easily be set to activate at a higher flow rate, and then it will produce up to 3.5 gpm at shower temperatures. The Bosch 2400ES and 2700ES will produce up to 5.9 gpm. The limits are set so that the flow rates are never too much for the burners to heat instantaneously, guaranteeing desired temperatures at the faucets.

  • What happens if two big draws (for example shower + washing machine) are running at the same time using an AquaStar?

  • The temperature will remain constant but the flow will decrease. The decrease in flow will be equal if the outlets are the same distance from the AquaStar and if the outlets have the same flow rate. If one outlet is further than the other from the AquaStar, the decrease will be most noticeable at the further outlet. If one outlet has a greater flow (bathtub compared to a sink, for example), the flow at the bathtub will not experience as much decrease as the faucet since water runs the path of least resistance and the tub's spigot is larger than the sink's.

  • What do you mean by endless hot water?

  • The hot water at any faucet or outlet will never run out as long as you are calling for hot water. The Bosch AquaStar tankless water heater will allow one major flow of hot water at a time. You could run shower after shower, then when finished, run loads of laundry, and then do the dishes, and so on. It is generally fine to run hot water at a sink while someone is taking a shower.

  • What is the average ground water temperature and why does it matter?
  • The average ground water temperature is 50-55 F (ground water temperatures vary as little as two to three degrees from summer to winter). Because tankless water heaters operate by increasing the incoming water temperature by a fixed number of degrees (called degree rise), knowledge of the ground water temperature allows you to know what water temperature a tankless water heater will produce.

  • How can the tankless water heater heat water instantly?

  • There are very powerful burners located beneath the copper heat exchanger that heat the water as it flows through the numerous feet of copper coils. Copper transfers heat instantly to the water in the coils.

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SERVICE AND MAINTENANCE:

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MISCELLANEOUS:

  • If these units are superior to tanks, why haven't I heard about them before?

  • This is the way the Europeans and Asians have heated water for over seventy-five years, and the engineering technology has evolved over this time. However, since fuel costs in the U.S. have been quite low, we've never had to think much about the waste of keeping a tank of water hot 24 hours a day.

  • Does TanklessWaterHeatersDirect.Com sell a tankless electric hot water heater?

  • Yes! We offer several electric tankless water heaters that can supply hot water for one sink (point-of-use) of for an entire home (one major flow at a time). The units can be installed in such a way as to eliminate a long water run (plumbed independently of the main hot water heating system). Ask for Powerstream (point of use models) or PowerStar (for the whole house) and Ariston point-of-use mini tank.



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