Best Bosch Tankless Water Heater Reviews

If you're in the market for a tankless water heater, use these Bosch tankless water heater reviews to help you make your decision.

As a certified HVAC specialist, I'm often asked about the best or most affordable brands of tankless water heaters. While the honest answer is usually "it depends," there is one brand that I wind up recommending over and over again, and that brand is Bosch.

Why is Bosch so special?

Well, for starters, all of their units are strong and capable.

There isn't a dud among them in terms of gallons per minute (GPM) or pressure per square inch (PSI).

They're also on the cutting edge of tankless water heater technology, offering many perks like hydro-powered ignition systems that require no batteries or electrical connections to operate.

Bosch Tankless Water Heater Reviews

All in all, Bosch is a good brand that makes good products, and that's why I've put together a list of the best Bosch tankless water heaters. While you can't go wrong with any item from their catalogue, these are what I would consider the best of the best.

Here we go!

1. Bosch Greentherm 950 ES LP - Our Top Pick

Offering 9.5 GPM in warmer climates (6 to 6.5 GPM in cooler), the Bosch 950 ES LP is a great all-around choice for propane tankless water heaters for larger families or houses. Not only does it balance power and energy efficiency in an admirable way, but it's also just 11.2 x 17.9 x 30.5 inches. It is a little on the heavy-side at 90 pounds, but it's weight is owed to it's increased flow rate (GPM). 

Performance

As a propane unit, the 950 ES LP offers more power and precision than most electrical units. 

It does require stainless steel venting since it uses gas and a live flame, so keep that in mind. 

Heat Output and Flow

As previously mentioned, the 950 ES LP offers 9.5 GPM at a 35°F degree rise. You can run up to 5 showers or 4 showers, a sink and a dishwasher all at the same time with no lack in hot water. 

Installation

The 950 ES LP is a propane unit, and that means it generates flames and fumes that need to be properly vented to maintain your indoor air quality. You'll need to be careful with the installation if you're doing it yourself, but installation is pretty simple so long as you have proper ventilation. Chances are if you are replacing an existing propane water heater with this unit in the same location, you already have a ventilation system that may or may not need an upgrade. Should problems arise, don't hesitate to contact a trained Bosch technician or ask questions to other buyers on Amazon.

Pros

  • Higher Flow Rate than other Bosch products
  • Good balance of power and energy efficiency
  • Installation is simple, but recommend hiring a professional due to it's 90 weight

Cons

  • Higher purchase price due to higher flow rate
  • Requires venting system to prevent the harmful build-up of fumes

With a perfect blend of power, performance, value and energy efficiency, the clear winner is the Bosch Greentherm 950 ES LP.


While none of its specs are the highest or the strongest on the market, it's hard to find a tankless water heater that does everything well, so this unit is the one to pick if you want the all-around best.

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2. Bosch AE115 PowerStar - Best Budget Bosch Heater

If you're looking for one of the most affordable units on the market, it doesn't get much better than the AE115 PowerStar. While it only offers 2.6 GPM, it's so low-priced that it can easily be utilized as a "point of use" unit with multiple boxes around the house; it's also just 4.2 x 15.2 x 15.5 inches and 20 pounds, so you won't have to worry about storage or installation space.

Performance

The AE115 PowerStar is an electric unit that's best suited for one application at a time. While it might be able to handle multiple showers or appliances at once, it's designed as a "point of use" unit to attach to specifics sinks, and that's how you'll need to utilize it for its highest performance value. But you don't have to take my word on this; other buyers on Amazon will tell you the same thing.

Heat Output and Flow

The AE115 PowerStar has a maximum flow rate of 2.6 GPM, so it's best suited to smaller homes or those with minimal hot water requirements. That said, as a small, compact "point of use" unit, you can easily install several of them at various sinks and showers to ensure that your entire residence has the water heating it needs.

Installation

Are you looking for a unit that doesn't require bells and whistles to install? Then the AE115 PowerStar is the one for you. As a fully electric unit, you won't have to worry about methane or propane gases, and it's small enough that you can install it just about anywhere, too.

Pros

  • Small, compact electric unit
  • Great value for the money
  • Can be installed anywhere, including under sinks or inside closets

Cons

  • Not suited for larger homes
  • Flow rate isn't the best on the market
  • Energy efficiency is somewhat low

If you don't have a lot of money to spend on water heating systems, one of the best Bosch tankless water heaters currently available for purchase is the AE115 PowerStar.

Not only does it come with an affordable price tag, but it also offers great long-term value in terms of strength and durability. Stop buying products that fall apart after just a few months of use!

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3. Bosch Therm 520 HN NG

There's a lot to love about the Therm 520 HN NG. For starters, it boasts 3-5 GPM while only requiring 117,000 BTUs; that translates into a solid 80 percent thermal efficiency. It's also relatively small for a natural gas unit, clocking in at 16.7 x 8.7 x 25.8 inches and 35 pounds, so you'll save plenty of room when you switch from a traditional water tank. Are you still unconvinced?

Performance

As a "whole house" unit, the Therm 520 HN NG is perfect for people who want to install their tankless water heater and be done with it. Not only will it serve your entire home from a single box, but it also comes with a special hydro-powered ignition system that means you don't even need electricity or a battery to turn it on.

Heat Output and Flow

The flow rate of the Therm 520 HN NG will depend entirely on where you live and how you use it. If you live in a warm climate or only have low-to-moderate hot water demands, you can expect upwards of 3-5 GPM; if you're in a cold climate where the unit has to work extra-hard to compensate for the temperature outside, you may only get 2-3 GPM.

Installation

These Bosch tankless water heater reviews are filled with products that are hard to install, aren't they? I apologize, but sometimes the trouble is worth it.

Let a Bosch technician handle the installation of natural gas units and you'll save yourself a world of trouble down the line.

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Pros

  • Whole-house unit provides power for multiple sinks and showers at once
  • Hydro-powered switch requires no electricity or battery
  • 80 percent thermal efficiency

Cons

  • GPM fluctuates depending on location
  • Requires galvanized B vents
  • Installation can be tricky

The propane-powered 520 PN NG Therm offers many of the same functions and features as its natural gas cousin above, including a 3-5 GPM flow rate and energy requirements of 117,000 BTUs. It's slightly bigger, however, at 10.5 x 18.5 x 36.8 inches and 40 pounds, and its thermal efficiency is lower.

Performance

The 520 PN NG Therm comes with many of the features that buyers have come to expect from the Bosch brand, including a non-electrical ignition system that doesn't require any kind of power grid to activate. You'll also enjoy whole-house hot water, but that's a given with a propane unit of this size.

Heat Output and Flow

Like its counterpart above, the strength of the 520 PN NG Therm will depend on how and where you're using it. Lower temperatures will mean a lower flow rate. I can assure you, however, that you'll always have enough for a hot shower in the morning!

Installation

As with any propane model, you'll need to be careful with the installation of the 520 PN NG Therm. It requires galvanized B vents to ensure that the fumes don't build up in your home. It might require a few other tools and circuits, too, so double-check on Amazon before you buy.

Pros

  • Delivers endless and instantaneous hot water
  • Special ignition system doesn't require a power grid to operate
  • Low minimal flow rate

Cons

  • On the upper tier of affordability
  • Flow rate will change depending on location
  • Slightly heavier and less energy efficient than its natural gas counterpart

5. Bosch 330 PN NG

Another great all-around unit, the 330 PN NG offers a nice combination of power and affordability. 3.3 GPM is nothing to sneeze at, and neither is a size of 10.5 x 18.5 x 36.8 inches and a weight of 24.4 pounds. While it is a "point of use" unit, it's so cheap that you can purchase multiple boxes without breaking the bank.

Performance

Say goodbye to electrical ignition switches! The 330 PN NG is yet another product from the Bosch brand that doesn't require traditional power to operate. Combine this feature with its solid flow and pressure rate, and you've got yourself a product worth another look on Amazon.

Heat Output and Flow

GPM isn't the only thing to consider when thinking about heat output. You also need to keep temperature rises in mind, and the 330 PN NG excels in this regard, offering 3.3 GPM at a 35°F degree rise. What do you think?

Installation

This natural gas unit needs to be either installed or vented outdoors, so make sure you're careful when you're setting it up.

Again, if you have any problems, don't be afraid to contact someone from Bosch or look up installation procedures on Amazon.

Pros

  • Decently priced for the size
  • Ignition system requires no electricity
  • Good energy efficiency

Cons

  • Can't be converted to propane
  • Best suited for small to mid-sized homes
  • Requires either outdoor venting or outdoor installation

Conclusion

At the end of the day, we do not really recommend Bosch tankless water heaters. This is because Bosch is expensive and it's not worth the money you spend.

We have written reviews on the top bosch products just for the sake of people who still loves Bosch products. Some people are attached to a particular brand.

If you still want a Bosch product, go for any model listed here - The Bosch 330 PN LP being our favourite choice (It's expensive).

If you really do not need a Bosch, go for other brands. We highly recommend the Ecosmart ECO 27Rheem RTEX 13Takagi TkJr2 and the Stiebel Eltron Tempra 24 .

Happy Shopping !

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