Dual Venturi system creates better combustion control, turndown ratio and easy field gas conversions.
2" venting up to 65' (including schedule 40 PVC).Vent Installation Detector (VID) for added safety.
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.
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
Buy new Boiler Viessmann Heat Only in just a few steps
Make an order
Contact us to buy a new boiler. Our team will guide you every step of the way and help you choose the right model.
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 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 Boiler Heat Only Navien from us?
9.7/10
215 reviews
4.8/5
reviews
Aunice Torres
Nov 01, 2025
Superior HVAC Heating and AirConditioningrepaired my furnace quickly and accurately. Friendly and skilled technician named Sean who made sure everything was perfect. Great company to call for HVAC repairs and maintenance.
Lidia Washinton
Feb 19, 2026
I had Superior HVAC Service, Heating & Air Conditioningreplace my furnace last week and couldn't be happier. The quote was fair, and they didn't try to upsell me on anything I didn't need. The technicians were skilled and had the job done in just a few hours. My house has never felt warmer!
Josh Block
Jan 08, 2026
My furnace died in the middle of winter. With the wife panicing I called Superior HVAC and the technician arrived to my house the same day. Told us our 16 year old furnace wasn't cutting it anymore. We decided to get a whole new furnace which was installed the very next day. They were very professional and left the area clean (Looked like no work was done after they left). I highly reccommend this company for furnace repairs
Clayton Devitt
Jan 10, 2026
Superior HVAC replaced my 17 year old furnace. Very quick and easy !
Alec Cesar
Dec 13, 2025
James from Superior HVAC was incredibly helpful, very supportive and efficient when he fixed our furnace. 10/10 amazing job!!!!
We will deliver Navien Heat Only Boilers to any of these cities
Nov 01, 2025
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