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
4.9/5
319 reviews
Jerry Tuckner
Dec 12, 2023
When I called them, the repairman was courteous and helpful.They did their job in time.
Irasema RamĂrez
Jan 16, 2025
Our water heater stopped working, so we reached out to Superior for help. Kurtis came quickly, fixed the issue in one visit, and was very professional. Highly recommend their service.
Juliet D'Silva
Jan 16, 2025
We hired Superior HVAC to take care of our furnace in our rental property and they did an amazing job! Reard was really nice and professional!!! Thank you so much for your services!
Natyn Paliy
Sep 20, 2023
The techs were very friendly, professional, communicative, and informative. They found our heat pump problem and explained the best option for our case. We will definitely be returning customers if we need repairs again!
Maverick Micah
Jan 10, 2024
We heard some strange noises from the water heater. So we contacted this service for an experienced guy to take a look at it. And they sent us a great professional! He found the root of the problem was the clogged burner. So, he removed all the sediment from there and that was it.Good and effective job, well done, plus not expensive at all.
Victor Turner
Dec 28, 2023
For years, the same technician has conducted semi annual checks on our AC and furnace since their installation. Always friendly and knowledgeable, he ensures he's looking out for our best interests rather than pushing unnecessary parts or services. Scheduling is easy online or via text, and communication and service quality are excellent. Working with this company is a pleasure.
Sophia Hatziantoniou
Jan 9, 2025
We recently had our water heater replaced by George at Superior and we couldn't be happier with the service. From start to finish, George was professional, efficient, and friendly. He explained the entire process clearly and ensured the new unit was installed with minimal disruption. The job was completed on time, and everything works perfectly. Highly recommend George and superiorfor anyone in need of water heater services!
Justin Glover
Sep 20, 2023
The guys were generous with information that saved me time, money and headaches. They took the time to help me and give me the right tips on my furnace installation at no cost. Thank you again!
We will deliver Navien Heat Only Boilers to any of these cities
Dec 12, 2023
Ajax