Boiler Installation &
Replacement in Southern NH
A.J. LeBlanc Heating installs and replaces gas, oil, and propane boilers throughout Southern NH. New Hampshire-licensed fuel gas fitters handle natural-gas and propane systems, while our technicians are factory-trained and certified on Carlin, Beckett, and Riello oil burners. We work on high-efficiency condensing boilers, hydronic systems, and radiant heat.
Gas & Propane Boiler Installation
A high-efficiency boiler can reduce fuel use compared with older equipment when it is correctly sized and matched to the home's zones and water temperatures. A.J. LeBlanc Heating installs gas, propane, and oil boilers from leading manufacturers and explains the efficiency, controls, venting, warranty, and installed cost of each option. Navien and Rinnai combi boilers can provide space heating and domestic hot water from one compact unit when that design fits the home.
- Gas and propane boiler installation and replacement
- High-efficiency condensing boilers 90+ AFUE
- Hydronic zone systems and radiant heat
- Navien and Rinnai combi-boilers (heat and hot water in one)
- Required permits pulled and inspections handled
- NHSaves rebates available
Oil Boiler Installation & Replacement
Many Southern NH homes heat with oil boilers, and when it's time for a replacement we make the process straightforward. We install oil boilers and can also discuss conversion options if you're considering switching to gas or adding a heat pump to reduce oil consumption. Our technicians are factory-trained and certified on Carlin, Beckett, and Riello oil burners, and we set up combustion for safe, proper operation within the equipment specifications.
- Oil boiler installation and replacement
- System flushing and zone valve replacement
- Oil-to-gas conversion planning and installation
- Heat pump hybrid systems to reduce oil use
- 24/7 emergency boiler repair
Boiler Installations
Boiler Brands We Install & Service
Saint Roch
Saint Roch offers cast-iron, triple-pass boilers that can be configured for oil or gas burners. A.J. LeBlanc Heating evaluates the home and existing system before recommending one for replacement.
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Energy Kinetics
Energy Kinetics System 2000 combines space heating with an indirect hot-water tank in oil, natural-gas, and propane configurations. A.J. LeBlanc Heating sizes, installs, and services the complete system.
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Navien
Navien offers wall-hung condensing boilers, combi-boilers, and tankless water heaters. A.J. LeBlanc Heating sizes, installs, maintains, and repairs Navien equipment throughout Southern NH.
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Rinnai
Rinnai offers tankless water heaters and condensing boilers. A correctly sized tankless unit can provide continuous hot water within its rated flow while using less floor space than a storage tank.
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Weil-McLain
Weil-McLain offers cast-iron and condensing boilers in gas, propane, and oil configurations. A.J. LeBlanc Heating installs and services the brand for hot-water and steam heating systems.
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Viessmann
Viessmann offers condensing gas boilers and related hydronic equipment. A.J. LeBlanc Heating installs and services Viessmann systems and sizes the equipment for the home's zones and design load.
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Buderus
Buderus cast-iron boilers remain common in New Hampshire hydronic systems. A.J. LeBlanc Heating installs and services Buderus equipment and evaluates the boiler, burner, controls, and connected zones together.
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Burnham
Burnham offers oil and gas boilers in cast-iron and condensing designs for hot-water and steam applications. A.J. LeBlanc Heating installs and services Burnham equipment throughout Southern NH.
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Utica
Utica offers gas and oil boilers for hot-water and steam heating systems. A.J. LeBlanc Heating installs, maintains, and repairs Utica equipment throughout Southern NH.
Learn moreBoiler FAQ
How much does boiler installation cost in NH?
A boiler replacement in Southern NH typically runs $8,500 to $15,000 installed depending on fuel type, efficiency rating, and whether any piping or zone valve work is needed. We provide free written estimates with all costs included upfront.
How long does boiler installation take?
Most boiler replacements take one to two days. We remove the old unit, install the new boiler, flush the system, test all zones and safety controls, and verify proper operation before we leave.
What is a condensing boiler?
A condensing boiler can recover heat that a standard boiler vents outdoors, but real performance depends on return-water temperature, controls, sizing, and the distribution system. We compare model-specific efficiency, required piping or venting changes, installed cost, and expected fuel use without promising a fixed payback.
What brands do you install?
We install Saint Roch, Energy Kinetics, Navien, Rinnai, Weil-McLain, Viessmann, Buderus, Burnham, Utica, Trio, and others. For gas boilers, Navien combi-boilers are a popular choice since they handle both heat and domestic hot water in one compact unit.
Do you offer emergency boiler repair?
Yes. We provide 24/7 emergency boiler repair. Call 603-623-0412 any time.
Get a Free Boiler Estimate
We assess your home, recommend the right system, review available rebates and apply eligible point-of-sale savings, and give you a written quote upfront. No pressure.
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.