Bosch Greenstar Boilers

Bosch Greenstar Boiler Overview

The Bosch Greenstar is a gas condensing boiler with an efficiency rating of up to 96.1% AFUE. All models of the Greenstar series are Energy Star rated. The Greenstar features a wall-hung design and is available as a space heating boiler with a hot water tank or as a combi unit. It features an Al-Si heat exchanger made of Aluminum-Silicon alloy, and combi units are equipped with a stainless steel heat exchanger. A fully modulating fan assembly helps to increase the unit’s efficiency. All models are available for use with LP or natural gas, with a conversion kit included.

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Consumer Reviews of Bosch Greenstar


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #1 of 3 Bosch Boiler
  • 90% of customers recommended

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Bosch Greenstar Boiler Reviews

Showing 6-10 of 30 reviews


4.0 rating
Somewhat Satisfied

It's very hard and very painfully to work with Bosch. Very unhelpful and very lazy company and Bosch workers is the worst in U.S.A. to help anyone.


Astoria, NY

"Very quiet and efficient"

5.0 rating
Very Satisfied

Most of boilers, and furnaces actually, look like they are from the sixties and haven't benefited from the latest technologies, let alone design. But not the Bosch Greenstar line. I was seduced by the installation video on YouTube. Gave a good idea of how things are neat and tidy inside and out. Very pleased.

Jean-Claude G.

Waukesha, WI

"I Love My Energy Star Boiler!"

5.0 rating
Very Satisfied

I have owned my Energy Star Bosch Greenstar boiler since I moved into my new house, which was in September of 2015. Our builder recommended the brand and model, having had several clients that loved it. The boiler at my previous house could not warm my home enough to be comfortable and we had problems that required maintenance on the boiler. We have had no issues with our Energy Star boiler and we are able to simply flip the switch and our boiler activates, warming our home quickly and to a very comfortable temperature. It worked like a dream during our colder winter months here in Texas. There is really nothing bad that I can say about this great product thus far and hopefully my experience with it continues! I will only be buying Energy Star boilers in the future and I am recommending them to all my acquaintances. Love this product!

Sealy, TX

"A Boiler of a Lifetime"

5.0 rating
Very Satisfied

I've owned my boiler for 3 years. We installed it in the house we bought to renovate and then live in. It is a small size boiler that hangs on the wall so it is out of the way and doesn't take up too much space. It also works as a space heater, which is an excellent additional feature. I don't dislike anything about it. It simply works great and we never have to do anything with it. I would definitely buy this again if we purchase a second home for renovation like this one or if a friend did the same i would recommend it.

seattle, wa

"Bosch Boiler Is Fine But Could Use Improvement"

4.0 rating
Somewhat Satisfied

My boiler works fine. It heats up very quickly and works fine. The only problem with it is that it doesn't heat the water hot enough for my liking. The water comes out warm to mildly hot which is satisfactory but it doesn't have the range of heat I would like. I have never had to replace or repair it because it has not ever broken and the mildly hot water isn't a big enough deal to warrant a repair. If i had a choice or an option i would chose a different heater initially but at most it works fine and does the job.

Atlanta, GA

Other Greenstar Reviews

In comparisons on between the Greenstar and similar units by Weil-McLain, Buderus and Triangle Tube, there were several positive comments about the Bosch unit. The majority of professionals appear to prefer the other units, but not by a large margin.

Greenstar Warranty

Product registration is required within 90 days of installation for maximum warranty coverage. The warranty for the Bosch Greenstar boiler is comprised of the following:

  • Limited lifetime heat exchanger warranty, pro-rated after the 10th year
  • Limited 5-year parts and labor warranty

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