Bosch Therm 330 PN NG Natural Gas Tankless Water Heater, 75,000 BTU, Non Condensing Whole House, Indoor, 3.3 GPM

Brand: Bosch
Model: Therm 330 PN NG
Condition: New
Warranty: 2-15 Years*
SKU: 826540
4.15 (2 Reviews)

Bosch Therm 330 PN NG Gas Tankless Water Heater

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The Bosch 330 PN NG Pro Natural Gas Tankless Water Heater 75,000 BTUs is perfect for smaller families that utilize use one hot water source at a time. Bosch natural gas tankless water heaters provide an effective, simple solution to residential hot water needs. Engineered with Piezo push-button ignition, this easy to use device is able to maintain a constant water temperature, even at varying flow rates.

No electrical connection is required for you to have access to 3.3 gallons per minute hot water capacity with the Bosch natural gas tankless water heater giving you unlimited access to hot water for one source at a time. Built for residential applications, the Bosch 330 PN NG Pro Natural Gas Tankless Water Heater should not be used in mobile homes or rooms that are normally kept closed.

Bosch 330 PN NG Pro Natural Gas Tankless Water Heaters are durable and built to last, with a life expectancy of 20 years. Plus, with a 15 year limited warranty from the manufacturer, it will give you peace of mind as a quality solution to single source water heating in your home.

  • Piezo ignition system requires no electrical connection
  • 78% thermal efficiency
  • 75,000 BTU maximum input
  • 3.3 gallons per minute capacity at 35F° rise
  • Endless hot water for 1 application at a time
  • Minimum activation flow rate of 0.5 gallons per minute
  • High to low temperature control
  • Vents with galvanized B vent - natural draft
  • Built for durability and serviceability with 15-year warranty and 20 year life expectancy
  • Type - Non-Condensing
  • Application - Residential
  • Max Input (BTU) - 75,000
  • Min Input (BTU) - 30,735
  • Capacity at 35 (°F) Rise (gpm) - 3.3
  • Capacity at 55(°F) Rise (gpm) - 2.1
  • Intelligent Cascading - No
  • Min Flow Rate - 0.5 gpm
  • Temp Range (°F) High - Low
  • Thermal Efficiency - 78%
  • Installation Options - Indoor
  • Dimensions (w x h x d) - 12 1/4" x 22 7/8" x 8 3/4"
  • Weight (lbs.) - 26
  • Inlet Connection - 1/2" NPT
  • Outlet Connection - 1/2" NPT
  • Gas Connection - 1/2" NPT
  • Max Water Pressure - 150 psi
  • Min Water Pressure - 13 psi
  • Min NG Pressure - 5.7 WC
  • Venting Options - Galvanized B-Vent
  • Energy Star Rated - No
15 year limited warranty on heat exchanger with 2 year warranty on all other parts
Customer Reviews

Great for a small place

When my old water heater finally started leaking, I decided to replace it with a tankless model. And Westside had an amazing price on a Bosch model that I couldn't pass up.
I work in construction and am on top of projects that my clients want. But when it comes to my own personal projects, I prove to be a chronic procrastinator. So I put a bucket under the little leak until it became a leak too big to continue ignoring. Finally, one Saturday morning, I decided it was a good time to tackle this project. Plumbers I have worked with in the past have turned the air blue with their opinions on installing some tankless water heaters. So I was expecting a tough time, being a non-plumber.
However, I thoroughly read the installation instructions (which is a foreign concept for most and drew out a diagram how I wanted the gas line, water lines, and exhaust flue to be routed. Of course, it took three trips to the Big Orange Box store to finally get all the right parts. But once I had all the parts, it came together great. Due to the place where I mounted the new water heater, the location of the water inlet and outlet, and the fact I wanted to also incorporate the hot and cold water shut-offs for a washer and dryer, there were probably about 40 copper joints to solder. My finger were crossed the first time I turned on the water main...and was ecstatic to find no leaks!

Now, ensure to purchase the right size unit for your needs. I live alone in a one bedroom, one bath condo. This Bosch unit was the perfect size for the application. But if you have multiple people living in one residence, this may not be the right one for you.

Also, after the heater was installed, I had some learning to do about the performance of a tankless water heater. If you turn on a hot water tap just a little bit, you'll never get hot water to come out of it. The water heater only kicks on when a certain volume of water passes thru it. For example, I live in a desert where the outdoor temps can his 120F, and the cold water temp is probably 70F. If you want to take a 80F shower in the summer, it requires just a little bit of hot water to mix with the "cold" water. And the water flow thru the heater may not be high enough to trigger it to turn on. So I adjusted my water heater's controls to the lowest settings, and it works great now. If you live in a colder climate, of course, you'll want to adjust it differently. But if you experience frustrations when its first installed, don't give up hope... just adjust it for your needs.

Now I wouldn't give it up for anything. Since it is a fraction of the size of a tank water heater, and that it mounts on the wall, I have more storage space, which is a huge plus in a small condo.


on 11-20-2015 by Kent

Bosch 330 NP NG Pro 75,000 BTU Natural Gas tankless water heater

Bosch 330 NP NG Pro 75,000 BTU Natural Gas tankless water heater is great appliance for everyday use.


on 07-10-2014 by Fred

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Questions & Answers

My piezo-electric igniter no longer clicks ( or lights the pilot ). Is it under warranty? Or where can I get a new one?

by Van S. on 02-03-2015

When purchased through our company, the manufacturer issues a 15 year limited warranty on heat exchanger with 2 year warranty on all other parts for this product.

on 02-04-2015

where can I get a qualified technician to install and repair Bosch tankless water heaters? where can I buy replacement parts, especially electronic components?

by tony N. from fort smith, AR on 05-07-2013

You will need to contact a installer locally. We dont have any lists to provide. Replacement parts you can also get from the manufacture

on 05-15-2013

is the bosch 330pn tankless water heater a 5" vent or 3"? thanks

by greg W. on 12-14-2012

This unit has a 4" vent.

on 08-05-2013


by rodger T. on 06-11-2012

We recommend having your application evaluated by a professional tankless water heater installer to ensure that your mobile home is suitable and has compliant plumbing to allow for this installation. Since the first two installations did not work (more details needed), we are unable to verify that the Bosch 330-PN-NG will work for your application. 

If a whole-home unit is not applicable for your mobile home, we also have available tankless electric water heaters which can be installed at point of use in your bathroom and kitchen, and will deliver instant hot water at the point of use.

For Point-of-use Electric models, please click here.

For additional information, call us at 1-877-998-9378 M-F 8a-4p (PST) for more advice and details regarding your specific application. 

on 06-11-2012
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