Youtube Twitter Facebook-f Instagram

Fröling S3 Turbo Wood Boiler

The Fröling S3 Turbo is an EPA-certified indoor wood boiler built for high-efficiency heating in homes, workshops, and small commercial buildings. Designed for ease of use, long lifespan, and superior combustion performance.
Explore specs, get pricing, or see the S3 Turbo in action:
Model Specs:
  • Fröling S3 Turbo: 96,000 - 164,000 BTU/hr
Request a Quote
Download Brochure
Fröling S3 Turbo Wood Boiler

What Makes the Fröling S3 Turbo Stand Out?

The Fröling S3 Turbo is a top-loading wood gasification boiler engineered for clean, efficient combustion. It’s optimized for use with thermal storage tanks, maximizing heat output and fuel efficiency. Designed for residential homes, workshops, and small commercial spaces, the S3 Turbo offers reliable performance and EPA-certified low emissions.
Available Models:
  • S3 Turbo Wood Gasification Boiler 30 - 96,000 Btu/hr output
  • S3 Turbo Wood Gasification Boiler 50 - 164,000 Btu/hr output

 Key Benefits of the Fröling S3 Turbo

Ultra-Efficient Wood Burning
Engineered for performance, the S3 Turbo uses downdraft gasification to extract more heat from every log, reducing both emissions and fuel waste. Pairing with thermal storage means fewer reloads and more consistent heat.
Smart Combustion Controls
Lambda controls and a variable speed fan enable the boiler to have variable output, which allows the boiler to more closely match heating needs. Air controls precisely match burning conditions with motorized shutters.
Carbon-Nuetral-icon
Long-Term Savings
The Fröling S3 Turbo offers notable long-term savings through its high efficiency, reduced fuel use, and lower maintenance demands. The cost of cordwood compared to oil, gas and electricity create significant savings over the 20+ year life of the boiler.

Technical Highlights & Features

Fröling S3 Turbo Feature Highlights

Performance & Efficiency Combustion & Fuel Ease of Use & Maintenance Safety & Reliability
  • Output range: 96,000 - 164,000 BTU/hr
  • Requires seasoned cordwood (15–25% moisture)
  • Built-in external heat exchanger changer cleaning system
  • Safety tested and
    listed
  • Lambda-controlled air dampers
  • Large firebox
  • Quick-start ignition
    door
  • Superior insulation for low radiation losses
  • 2020 EPA Certified for Emissions
  • State-of-the-art long lasting combustion chamber
  • Cool-touch
    design
  • Solid steel construction with reinforced welding for long-term structural integrity
  • High-velocity
    exhaust
  • Smoke extraction passage
  • Built-in storage tank controls
  • High-limit temperature
    cut off
  • Vertical heat exchangers
  • Variable speed induced draft fan

Who’s It For?

  • Homeowners and business owners looking for an alternative to oil, gas and electric heat

  • Users preferring ultra-efficient cordwood heating

  • Those wanting low-maintenance, easy operation

  • Environmentally minded users

Installation & Maintenance Considerations

The Fröling S3 Turbo is engineered for efficient operation and ease of upkeep. Designed to work seamlessly with thermal storage, it offers long-term performance with minimal maintenance.

  • Pair with Thermal Storage: For optimal efficiency and reduced cycling, the S3 Turbo needs to be installed with thermal storage.
  • Ash Removal: Ash doors are front-mounted for quick access, and the boiler’s clean combustion means the ash is fine and dry, making removal simple and mess-free.
  • Built-in heat exchanger cleaning system: This system dramatically reduces the need for hand brushing, which is an important component of continuous efficiency. Ash from the heat exchanger is easily removed through a rear access door.

How to Operate the Fröling S3 Turbo

The Fröling S3 Turbo is designed for simplicity and control, so you get high performance without the hassle.
  • Fast, Hassle-Free Start-Up:
The unique lighting door makes ignition quick. No switches, no levers. Just load the wood, light it, close the door, and walk away.

  • Smart Digital Controls:
A user-friendly, menu-driven interface shows real-time boiler status, temperatures, and system performance at a glance.

  • Responsive Combustion:
A lambda sensor and variable-speed fan automatically adjust the burn rate to match your heat demand.

  • Efficient Burn Every Time:
Motorized air shutters fine-tune airflow, ensuring clean, consistent combustion with minimal waste.
How-to-Operate-Fröling-S3

FAQs about The Fröling S3 Turbo

The Fröling S3 Turbo can last 20 years or more with proper installation and maintenance. Its durable design, quality components, and clean-burning combustion system help extend its service life.
Yes. The S3 Turbo features an external heat exchanger cleaning lever and accessible ash compartments, making routine maintenance quick and mess-free. Most users empty the ash compartments upon each reload and do 1-2 thorough cleanings per year. Check out our YouTube page for a detailed breakdown of the steps involved in a thorough cleaning for Fröling S3 Turbo - YouTube - Fröling S3 Turbo Cleaning Videos.
Absolutely. It's EPA-certified, safety-tested, and built with multiple safety features, including a sealed combustion chamber, smoke extraction, and a cool-touch exterior for safe indoor operation.
Pricing depends on the model size, installation setup, and any required accessories like thermal storage tanks. While it’s a premium upfront investment, lower cordwood fuel costs offer substantial long term savings compared to oil, propane and electricity.

What Our Clients Say About Us

Jacob from Vermont: S3 Turbo 30 w/ 600 gallons of Thermal Storage
“In 2023 I purchased a Fröling S3 Turbo 30 cordwood boiler with 2x300gal bulk storage tanks and installed the system to feed a multi-zone hydronic radiant heating system. Simply said, the Fröling is a wonderful wood boiler. With one load, I heat my home for 12-24 hours, depending on the outside temperature, and on average I'm closer to the 24-hour frequency. My home is 1500 square feet, and I keep my home around 62-64 degrees. The system is a wise choice for wood burners. By storing heat in bulk water tanks, S3 Turbo burns wood hot and fast, which is more efficient, and then uses the water tanks like batteries. It's a well thought out system and a pleasure to own; I love mine.”
Kris from Montana: S3 Turbo 50 w/ 800gallons of Thermal Storage
“I became interested in wood boilers due to the ability to provide all the heat and domestic hot water for my home without having to use propane or electricity. Mark and Brooks were very helpful in helping me create a system that fit my needs and helped me better understand how the system operates. They provided ample communication with me throughout the planning, ordering, and shipping process.”
Brian from Missouri: S3 Turbo 30 w/ 500gallons of Thermal Storage
“I love my Fröling boiler! I have an S3 turbo 30 with 500 gallons of thermal storage. I’m located in the middle of Missouri and I'm heating a 2500 square foot house and a 600 square foot apartment/garage with only 3-4 cords of wood annually.”
Jeremy from Maine: S3 Turbo 50 w/ 1000gallons of Thermal Storage
“I'm very excited to have made the investment in my new Fröling Wood Boiler. For many years I've heated my house with wood, most recently with a Tarm solo 60 gasification boiler. I can already tell that I'll get more heat out of each batch of wood. Every single part of the transaction with Froling Wood Boilers, went smoothly. I highly recommend this company for your wood heating needs.”
Breadtree Farms/Noah from New York - S3 Turbo 50 w/ 1200gallons of Thermal Storage
“We are operating one of the largest commercial agroforestry operations in the Northeast, and our cycles of annual stewardship often result in a lot of available firewood, as we manage hedgerows, improve forest stands, and (in the future) make thinning cuts in our chestnut and hickory orchards. We have been very happy to switch from fuel oil to the Fröling S3 Turbo, which is saving us thousands of dollars a year, substantially reducing our carbon footprint, and increasing the resiliency and energy independence of our operation.”
Klarissa and Byrke from Montana: S3 Turbo 50 w/ 800gallons of Thermal Storage
“Our Fröling S3 Turbo 50 is an excellent system! Easy to use, easy to clean and very efficient.”
Gordon from Wisconsin: S3 Turbo 30 w/ 800gallons of Thermal Storage
“I have used my Fröling boiler for the past 4 seasons and I could not be more pleased. We have all in floor heat, 3400 sq ft, and we have never been more comfortable. I have burned wood for 45 years and what I like best is: with the water heat storage we burn wood cleaner, safer, and more efficiently. No more of too much heat or not enough heat, it’s like heat on demand! This system enables us to heat the shoulder months of November and April efficiently, with one burn every 2-3 days. Then from December through March we do 1-2 burns a day allowing us to match our heat demand accordingly. In my opinion, the Fröling S3 Turbo is the best wood heating system out there!”
Doug from Connecticut: S3 Turbo 50 w/ 1000gallons of Thermal Storage
"I was a previous wood boiler owner for the past 16 years. I decided to upgrade my boiler and after researching and speaking with Brooks and Mark, I decided to purchase a Fröling S3 Turbo boiler. They both agreed that this unit would adapt flawlessly to my preexisting system. I would like to thank Froling Wood Boilers, especially Brooks, Mark and Kristin for their excellent and courteous customer service."
Todd from Colorado: S3 Turbo 50 w/ 800gallons of Thermal Storage
“I wanted to take this opportunity to thank everyone at Froling Wood Boilers, especially Brooks for all the over the phone support. They were always there to answer my questions and offer solutions. Once I texted Brooks after hours with a question expecting to hear back the next day. I was surprised when he called me back right away while he was at a baseball game! Now that is the definition of Customer Support! I can't wait to throw in the first log this winter and fire the boiler up to heat my house.”
Carl from Vermont: S3 Turbo 50 w/ 800 gallons of Thermal Storage
“I love my Fröling S3 Turbo. I am burning half the wood versus my last wood boiler – 10 cords vs about 5 cords.”
Michael from New York: S3 Turbo 30 w/ 400 gallons of Thermal Storage
"I’d like to thank Brooks for his assistance with purchasing the boiler. He made the whole process smooth and seamless. Pickup was easy and he was always available to answer any of my questions."

Downloadable Resources for the Fröling S3 Turbo 30 & 50

Looking for more technical details or a quick overview? Our brochures, product summaries, and specification sheets make it easy to compare models, plan installations, and share information with your team. Download what you need, all in one place.
Downloadable Brochures 
S3-Turbo-Brochure

S3 Turbo Brochure

DOWNLOAD

Cordwood Boiler Planning Guide

DOWNLOAD

S3 Turbo Installation Instruction

DOWNLOAD

S3 Turbo Operating Instructions

DOWNLOAD
S3 Turbo Service Handbook for S-Tronic Plus.Lambda

S3 Turbo Service Handbook for S-Tronic Plus.Lambda

DOWNLOAD

S3 Turbo Refractory Replacement Instructions

DOWNLOAD
S3 Turbo 30 Test Report

S3 Turbo 30 Test Report

DOWNLOAD

S3 Turbo 50 Test Report

DOWNLOAD

Get in Touch!

Claim your energy independence and start saving with the clean-burning, efficient Fröling S3 Turbo wood boiler.

Get in touch with us today for help finding the best model for your needs.