Viessmann High-Efficiency Condensing Boilers
A.J. LeBlanc Heating installs and services Viessmann condensing boilers throughout Southern New Hampshire. Viessmann has been engineering heating equipment in Germany for more than a century, and the residential lineup is known for system longevity, stainless-steel heat exchangers, and consistently high real-world efficiency.
Viessmann Boilers
Viessmann offers a comprehensive range of German-engineered products, from oil and gas-fired boilers to integrated hot-water heating systems. For more than a century, Viessmann has been recognized for system longevity, stainless-steel heat-exchanger construction, and consistently high real-world efficiency. A.J. LeBlanc Heating handles new Viessmann installs, scheduled maintenance, and repairs on existing systems throughout Southern New Hampshire.
Our technicians are factory-trained and certified on all three major oil burners, Carlin, Beckett, and Riello, so we can match the right burner to your equipment and fine-tune it for optimal efficiency.
Full Viessmann Boiler Lineup
- Viessmann Condensing Gas Boilers
- Viessmann Oil Boilers
- Viessmann Combi-Boilers
- Viessmann Wall-Hung Boilers
- Stainless-Steel Heat Exchanger Construction
A Trusted Viessmann Installer in Southern NH, Family-Owned Since 1928
Authorized Viessmann Dealer
We meet the manufacturer's standards for training, product knowledge, and installation quality, which matters for warranty coverage and long-term performance.
4th Generation, Family-Owned
Same family, same values since 1928. More than 30,000 Southern NH customers have trusted us with their heating.
Readers' Choice Winners
Voted Best HVAC, Best Plumber, and Best Electrician in the Union Leader Readers' Choice Awards by Southern NH homeowners year after year.
Installation, Service & Repair
We handle new Viessmann installations, routine maintenance, and repairs on existing systems. One call covers it all.
Ready for a Viessmann Installation?
Call or fill out the form below. A Home Comfort Advisor will review your needs, recommend the right Viessmann model, and provide a written estimate.
Get in Touch
Fill out the form and we'll get back to you. Usually the same business day. For emergencies, call us directly.
Contact Information
Mon-Fri: 8am-4:30pm
Evenings & Weekends: Emergency Service
24/7 Emergency Service
No heat? No hot water? Call 603-623-0412 any time.