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Lochinvar Knight KBN151 119000 BTU High Efficiency Natural Gas Boiler

SKU: 189509

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Save 25% · Retail: $5,384.00

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About the Lochinvar KBN151

Lochinvar Knight KBN151 119000 BTU High Efficiency Natural Gas Boiler. The Lochinvar Knight Series Boilers are the smartest choice for a condensing performance boilers. Engineered with Lochinvar's exclusive SMART SYSTEM Control (LCD Display Screen, and the ability to control up to three temperature set-points) and a vast variety of other innovative features. Knight Boilers promise to deliver ease of installation and maintenance. With up to 95% efficiency, low emissions and a fully modulating burner, these are the best Green Choice for today's conscious market. All boilers are equipped for direct-vent installation with air intake and exhaust runs up to 100 feet. This range of choices is ideal for residential or light-duty applications such as small hotels, schools and office buildings.

Product Details

Product: Boiler
Manufacturer: Lochinvar
Fuel Type: Natural Gas
Other Info: Password Securable
Mpn # KBN151
Shipping Dimensions 18.0" x 16.0" x 34.0"
Weight 157.00 lbs.

Product Features

  • Modulating Burner with 5:1 Turndown
  • 2 line, 16 Character Display
  • Dual Level Password Security
  • Domestic Hot Water Prioritization
  • Built In Cascading Sequencer For Up To 8 Boilers
  • 0-10 VDC Input Control
  • Outdoor Reset Control With Outdoor Air Sensor
  • Low Water Flow Safety Control & Indication
  • Alarm On Any Failure Contacts
  • Service Reminder
  • Freeze Protection
  • Vertical and Horizontal Direct Vent
  • Night Setback
  • Time Clock
  • Three Pump Control (System, Boiler & DHWP)
  • Data Logging (Ex: Hours Running, Space Heating)
  • Programmable System Efficiency Optimizers (Ex: Anti-cycling, Ramp Delay)
  • ASME Stainless Steel Heat Exchanger
  • Automatic Reset High Limit
  • Inlet & Outlet Temperature Sensors
  • Boiler Circulating Pump
  • 30 psi ASME Relief Valve
  • Zero Clearances to Combustible Material
  • SMART SYSTEM Digital Operating Control


4.5 out of 5 rating is our rating for PlumbersStock, we got that rating because we have lots of experience and great people with expertise in plumbing. BUT WE WANT YOUR HELP. This product doesn't have any reviews yet, and we don't want to write our own reviews. It is more valuable to us that the customers get to share their experience with our products. Please, if you have any experience with this product, take a moment to share and help someone else who is trying to make a decision. Thank you!

Questions & Answers


Hi! Thank you for visiting We value your interest in our Lochinvar Knight KBN151 119000 BTU high-efficiency natural gas boiler. Yes, you are correct. This natural gas boiler can be used with propane gas. It is convertible from natural gas to LPG. For more information about this natural gas boiler, please check page 6 under Standard Features of this brochure. For other inquiries, please contact one of our customer support specialists at 435-868-4020 or through e-mail @ If you're interested in purchasing this product, feel free to click Add to Card, enter your zip code and you're all set. Happy shopping!


Hi, Thanks for visiting! Lochinvar water heaters and boilers like the Lochinvar Knight KBN151 119000 can be supplied with orifice sizing to operate on propane air mixtures. In order to insure you have the proper orifice to accomplish a clean burn(Proper Combustion), you must know the specific BTU per cubic foot and specific gravity of the propane air mixture. Once the proper replacement orifice is installed, Lochinvar recommends that the owners of the equipment carefully monitor the propane air mixing equipment to ensure a consistent gas quality. Many times a propane air system will tend to run rich and have a high Btu that results in sooting and/or operational problems. If you have any more questions or concerns, please don't hesitate to call one of our friendly customer service representatives for more information. They can be reached at 435-868-4020 or, if you prefer, through e-mail @


Good day! We're glad that you are interested in our Lochinvar Knight KBN151 natural gas boiler. Placement of this product within a building will never be a problem. It permits up to 100 feet of air intake and 100 feet of exhaust vent with PVC, CPVC, polypropylene or stainless steel pipe. It has 5 flexible options for direct venting which you can see on page 6 of this specification sheet. If this is what you're looking for, just click on Add to Cart and enter your zip code to confirm your order. Thanks for choosing as your online shopping buddy! Have a great weekend.


Good day! We appreciate your interest in our Lochinvar Knight KBN151 119000 BTU High-Efficiency Natural Gas Boiler. Yes, this product will work at high altitudes. In placing an order, please contact our customer support department @ 435-868-4020 between 8:00 AM to 7:00 PM MT, have this SKU # 189509 ready, and kindly tell them that you're going to order this KBN151 for high altitude application. Thanks for choosing as your online shopping buddy. Have a great day!


Good day! We appreciate your interest in our Lochinvar Knight KBN151 119000 BTU High Efficiency Natural Gas Boiler. This is one of Lochinvar's high quality freestanding fire tube boiler. You will find more information on this Knight natural gas volume on page 6 of this product spec sheet. If you decide to place an order, just click Add To Cart and fill in the required fields. Should you have further questions, please let us know. We are not here to just make a sale. We want YOU to be confident and happy in your plumbersstock purchases. Thank you for shopping with – the perfect site to find high-quality products at low, low prices!

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