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
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
After confirming your order, our technician will arrive at the appointed time to inspect the property and clarify the necessary details.
Delivery and installation work
We will deliver the boiler to you. Our team will handle the installation with efficiency and professionalism, ensuring a seamless setup.
Get a warranty
We offer a warranty that covers different parts and services. Even after the warranty expires, you can rely on our post-warranty services.
Why should you buy a Gas Boiler Only Heating from us?
9.7/10
215 reviews
4.9/5
1190 reviews
Cory Macey
Jan 23, 2026
Friendly and knowledgeable
M Rodic
Mar 30, 2026
Superior HVAC Service is excellent. Great customer service and very good work. They were helpful and assesed my situation based on my needs. I will call them again when I need more work done.
Degala Sidhartha
Apr 27, 2026
One of the best HVAC service experiences I’ve had. The technician was friendly, experienced, and very efficient. They fixed the issue quickly and ensured everything was working properly. I would highly recommend them.
Adriella Guevara
Jun 04, 2026
Had Superior come out because my furnace was making a loud banging noise when it kicked on. Turned out to be a delayed ignition issue caused by a dirty burner. The tech cleaned everything thoroughly, tested it several times to make sure it was resolved, and explained why it's a safety concern to let it go. Really appreciate the safety-first approac
We will deliver Heat Only Gas Boilers to any of these cities
Jan 23, 2026
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