Advanced user interface with Setup Wizard is made easy with backlit panel, click-wheel control and intuitive text.
Low gas pressure operation. Negative pressure regulating gas valveensures maximum performance all the way down to 3.5" of water column on natural gas and 8" of water column on propane gas.
Dual Venturi system creates better combustion control, turndown ratio and easy field gas conversions.
1/2" gas pipe capability up to 24' (subject to local codes). Cuts installation time, no need to install new gas lines for retrofit applications.
Patented stainless steel fire tube heat exchanger Navien’s innovative heat exchanger design is ASME‑Certified,“H” Stamped, and reduces high-stress point weld failures common on other combi-boilers.
NHB integrated control provides industry-leading options and features including adjustable heat capacity, temp boost for outdoor reset control, adjustable anti-cycle timer and freeze protection.
The condensing technology of the dual stainless steel heat exchangers saves energy, reduces greenhouse gasses.
1/2" gas pipe capability up to 24' (subject to local codes). Cuts installation time, no need to install new gas lines for retrofit applications.
The sophisticated gas flow control system provides a high turndown ratio which reduces energy waste and excessive boiler cycling.
NHB integrated control provides industry-leading options and features including adjustable heat capacity, temp boost for outdoor reset control, adjustable anti-cycle timer and freeze protection
The condensing technology of the dual stainless steel heat exchangers saves energy, reduces greenhouse gasses
2" venting up to 65'; 3” up to 150’ (including schedule 40 PVC)
The sophisticated gas flow control system provides a high turndown ratio which reduces energy waste and excessive boiler cycling
Integrated ECM pump and DHW diverter valve on all models
Small zone valve systems may not require an additional pump or a low loss header
Modulating Combustion up to 11:1
Models up to 96% AFUE
Wi-Fi on board for remote control and monitoring
Get the Gas Boiler High Efficiency in just a few steps
Make an order
Contact us to start the process of purchasing a new boiler. Our customer support team will guide you through all the necessary steps.
Arrival of a technician
Once your order is confirmed, we will promptly visit your location and conduct a thorough inspection, ensuring all necessary details are clear.
Delivery and installation work
We'll deliver the boiler to your location, and our experienced experts will handle the installation efficiently and professionally.
Get a warranty
You receive a warranty that covers various components and services, and when it ends, you can count on our post-warranty services.
Why should you buy a High Efficiency Boiler Natural Gas from us?
9.7/10
215 reviews
4.8/5
reviews
Tj Mondesal
Nov 01, 2025
Superior HVAC Heating and Airconditioning fixed our old boiler fast. The technician named Daniel was knowledgeable, polite, and clearly explained the repair process. We are completely satisfied with the excellent service and fair pricing. Highly recommend this professional company!
Evan MacDougall
Oct 28, 2025
Evan from Superior HVAC Service ran a combustion analysis on our gas furnace. He adjusted the air-to-fuel ratio and optimized performance. It runs better than it has in years.
Mika Morada
Feb 17, 2025
Quick response time! Tech named Ian was skilled and efficient. Air handler is running smoothly again. Great value for the price. Great job Superior HVAC!
Angelmae Lebico
Mar 13, 2025
Excellent service! My furnace was repaired quickly and efficiently. The technician was very knowledgeable and his name is Alvin. Thank you Superior HVAC
Gertrude Doula
Dec 17, 2025
Im extremely relived to have had Superiors HVAC Service come my house, I was dealing with high humidity in my home they were able to send a technician named Paul to my house in 30 minutes or less and Paul quickly diagnosed it to be a undersized evaporation coil and replaced it for one the proper size he went into detail telling me how the one in my system was for a 10000-15000 sq.ft. home and my house is roughly 22000 sq.ft. ,Very thankful for the crew at Superior HVAC Service for their workers like Paul. Highly recommended company
We will deliver a Boiler High Efficiency Gas to any of these cities
Nov 01, 2025
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