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Bosch Electric Tankless Water Heater Review (January 2024)

The Bosch Tankless At A Glance

Top Perk > Compact and Powerful

Bosch Electric Tankless Water Heater
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If you are looking for a simple budget friendly tankless water heater for a single use application, such as your kitchen or bathroom sink, then the Bosch Electric Tankless Water Heater will make a perfect choice. Besides being able to constantly supply you with hot water on demand for as long you need it, this unit is pretty easy to install and comes a great price for its value. While it may not be suitable for using in larger appliance like a dishwasher or shower, it is probably the best unit you can get for you sink to ensure you will never be in need of hot water. With this unit, you can be rest assured of sustained temperature control. While it may not come with advanced features, it still offers a great value especially at its price. And you won’t look for space to install it due to its compact size.

  • 9.6/10
    Efficiency - 9.6/10
  • 9/10
    Ease of Use - 9/10
  • 8.8/10
    Value - 8.8/10
  • 8/10
    Features - 8/10

Bosch Tankless

  • Cost: $$$
  • Model Number: Bosch Tronic 3000
  • Weight: 4.9 pounds
  • Size: 12.2 x 3 x 6.5 inches
  • Energy Factor: 0.98
  • Usage: Point of use for under a kitchen or bathroom sink
  • Power Source: Electricity
  • Voltage: 120 Nominal
  • Warranty: 5 years limited



Tankless water heaters are becoming increasing popular as the best solution when it comes to accessing hot water on whenever you need it.

Apart from having a longer lifespan, tankless water heaters are generally more economical and environmentally friendly than traditional tanked heaters. They provide hot water on demand, for as long as you want it, and will significantly cut down the amount you spend on water and energy every month.

In fact many homeowners have already reported that their bill was drastically reduce to more than 30 percent when they replaced their old hot water tanks with tankless heaters. And it’s not surprising considering the fact that traditional tanked heaters use energy round the clock while tankless heater only use energy on demand (i.e., whenever you need hot water).

As a result, these devices have become one of the most important commodities in households. Their environmental friendliness, convenience and low power consumption makes them a worthwhile investment; one every homeowner is supposed to go for.

While tankless water heaters are generally considered very useful, it’s still important to go for the best products if you want to enjoy the full range of benefits. Choosing the right device that can meet your specific needs will ensure you get the best value for your money. Unfortunately, it’s not always simple as it sounds.

There are numerous tankless water heaters in the market; finding one that will adequately meet your household needs will take more than an attractive sales promotion. It is advisable to know about what others are saying about a particular product before you decide to go for it. One product that has received a lot of positive reviews by customers is the Bosch Electric Tankless Water Heater.

The Bosch Electric Tronic 3000 Electric Water Heater is one of the leading products from popular brand, Bosch that can resolve all the inconvenience you encountered using water heaters. It comes with a sleek, small design that allows it to be installed independently under your sink or as a pair with the entire home sink system. Even if you have an efficient heater already in place, you can still consider using the Tronic 3000 for providing hot water on demand in in your office building. This way, you don’t get to completely loose out on such a unique product.

Many tankless water heaters often present some difficulty when setting them up. However, with the Bosch Tronic 3000, installation is not much of a hassle.

At 98%, this unit is one of the most efficient heaters available in the market. In order words, you require very little electricity to use this unit. With power ranging from 3.2 KW to 12kW, you can adjust based on your needs and incoming water temperatures, without breaking the bank with your monthly utility bills. We also love the fact that the unit itself is sleek, small and well designed, making it able to fit under your sink without sacrificing needed storage space.

We believe the Bosch Tankless is the best under sink tankless water heater available in the market right now, which is why we have it in our list of the best tankless heaters.


The Bosch Tronic 3000 features a sturdy construction which includes glass linings to prevent leaks or damage to its body. This enables the system to be able to withstand long period of use of also resist impact. In order words, you don’t have to worry about replacing the machine in a few years’ time.

Interestingly, the Bosch Tronic 3000 is a point-of-use system, which means it provides hot water on demand to the sink where you need it. And it uses electrical power to accomplish this.

So no more waiting…with this unit, it’s just a simple push to access hot water.

This unit is also equipped with a pre-installed valve that enables you control the temperature and pressure of the incoming water.

You will be happy to know that the Bosch Tronic 3000 is backed by a 5-year and 1-year warranty on its heating element and other components respectively; although, both warranties are limited.

All the parts used in this system are of great quality; this enables it not to wear out easily.


If you’re looking for an electric tankless heater that consumes less power while delivering an efficient service, the look no further than the Bosch Tronic 3000. One of the ways it is able to accomplish this is through the use of a CFC (chlorofluorocarbon) free foam to provide insulation.

While other models in the Bosch Tronic 3000 series have water flow rates around 0.5 to 1 GPM, the US12 model has a flow rate of 1.8 GPM which is pretty cool considering its small size. It is also interesting to note that only this model comes with the thermostatic control.

while the flow rate is much lower; it goes from 0.5 GPM for US3 model to 1.8 GPM for the US12 model.The models are small and lightweight, equipped with the copper heat exchanger and heating elements, where only the model US12 features the thermostatic control. This allows you to adjust the water temperature to your desired choice. However, you should be careful when doing this because the water can become extremely hot.

Like the other three models in the Bosch 3000 series, the US12 model has a rated thermal efficiency of 98%. At this efficiency, and without the use of storage tanks, energy loss is greatly minimized and as a result you get to save on your bills.

Also, this unit is a multipurpose heater, which means it is designed for providing water everywhere in your house; whether, it’s your bathroom or powder room, or even your patio sink.


Installing the Bosch Tronic 3000 is easy not just because the manufacturer claims so but because it truly is, as attested by various customers. It requires a small space and can be plugged an anywhere as long as the electrical requirements are met.

An installation manual is provided with detailed step-by-step instructions that are easy to implement. Even if you are a newbie, you should be able to do a good job as long as you properly follow each one of the few steps laid out, though you will need some accessories to get started.

As mentioned earlier, due to the lightweight and compact design of this unit, you can hook it up anywhere, even in a cabinet space, and you would appreciate the glamour it adds to your home décor. It’s definitely not like one of those water heaters you buy and try to hid away…this one is beautiful!

You can watch the download video here.


  • Energy Efficient
  • Compact Construction
  • Leak Prevention
  • One of the smallest units
  • Well reviewed by thousands of users
  • Industry leading warranty
  • Quiet unit for electric tankless
  • Convenient temperature Control
  • Instant Hot Water Supply
  • Water Savings
  • Easy Installation
  • Long lasting


  • Mineral Deposits may accumulate
  • Low flow rate, only useful for single sinks

Frequently Asked Questions

Q: Can i plug this in a regular wall plug?
A: No, the Bosch Tronic 3000 should be hard wired to a dedicated breaker.
Q: Can I use this water heater to fill a washer with warm water?
A: Absolutely. That’s what it’s best for one appliance one shower application.
Q: Is this dc or ac?
Q: How much gallon capacity does this have?
A: It’s doesn’t hold water; it heats it as it flows
Q: Will this tankless hot water heater work in a travel trailer?
A: Space wise it would be great but you need to check the amps.
Q: Does this heater supply enough hot water for a 30minate shower?
A: As long as you have power, you have hot water.
Q: Does this have a recirculation pump built into it?
A: No
Q: What is the wiring requirement?
A: The requirement for the supply wiring is 8guage
Q: Can you install this on the existing hot water supply?
A: No; the directions for installation states that it must be on a cold line only.
Q: How many amps does this unit pull?
A: 7.2KW
Q: can I have it supply water to a self contained bathroom like Vanity sink, shower and Jaccuzzi bath?
A: Yes, though keep in mind the flow rate is quite low.
Q: Can the item be used for in-floor hydronic space heating?
A: No, The Bosch WH17 is for heating DHW only and not approved for heating applications.
Q: Can it be mounted upside down?
A: No.
Q: Will this unit work with a single 60 amp breaker?
A: NO!!! It requires 30 amp 240 volt circuits.
Q: Is the temperature setting limited to high or low, or is it a variable rheostat with settings in between?
A: The Bosch Tronic 3000 only has the high and low temperature settings
Q: What are the electrical requirements?
A: The Bosch Tronic 3000 US3 (Powerstream Pro RP3P) requires a 30AMP breaker at 120V.

The Bottom Line

If you desire a quality tankess water heater for a single point applucation, whether under your kitchen or bathroom sink, then the Bosch Electric Tankless Water Heater will make a great choice. It comes at a price which is reasonable for a product of its quality and reputation. As long as there’s water supply, it promises to deliver hot water on demand for as long as you need it.

Believe it or not, this unit is a good catch; one that will give you the best value for your money.

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