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PELLET DUO — Automatic, Multi-Fuel Hydronic Heat
PELLET DUO 50 Pellet Boiler, 170K BTU
Heating Capacity: Up to 6,200 ft²
A fully automatic, multi-fuel pellet boiler with a manual firebox backup, sized for larger homes and light-commercial hydronic loads.
Model
PELLET DUO 50 · 170K BTU · Up to 6,200 ft²
- PELLET DUO 20 · 65K BTU · Up to 3,000 ft²
- PELLET DUO 50 · 170K BTU · Up to 6,200 ft²
- PELLET DUO 95 · 330K BTU · Up to 12,000 ft²
- PELLET DUO 150 · 500K BTU · Up to 15,000 ft²
- PELLET DUO 300 · 1000K BTU · Up to 30,000 ft²
- PELLET DUO 500 · 1700K BTU · Up to 55,000 ft²
- PELLET DUO 1000 · 3400K BTU · Up to 110,000 ft²
$8,265
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Customer Success Stories
This boiler gives us a powerful, flexible heating system that can be adjusted to suit our home.
A flexible boiler built for real-world heating
A homeowner shares his MBTEK boiler installation, explains how the system operates, and walks through the adjustments used to optimize its performance.
Product details
- All-in-one controller
- Lower-cost fuel flexibility
- Certified technology
- Real-time monitoring
Pellet Duo – 92% Efficiency Pellet Boiler (Large Capacity, Up to 2 Weeks Autonomy)
High-performance automatic pellet boiler designed for high heat output, extended autonomy, and multi-fuel flexibility. Ideal for heating large homes or high-demand applications with minimal maintenance.
Key Benefits
- Up to 92% efficiency for optimal heat recovery
- 4–10 days autonomy (up to 2 weeks depending on usage)
- Multi-fuel compatible (pellets, wood logs, corn, grains, or other biomass)
- Fully automatic operation with smart combustion control
- Built with premium European materials
| Heat | Up to 6,200 ft² |
|---|---|
| BTU | 170K |
| Weight | 1,100 lb |
| Width | 45 in |
| Depth | 31 in |
| Height | 65 in |
| Manual firebox | 28 gal, max log 19 in |
| Automatic hopper | 105 gal / 625 lb pellets |
| Efficiency | 92% |
| Autonomy | 4–10 days, up to 2 weeks depending on usage |
| Certification | EN 303-5:2012 |
- Heat
- Up to 6,200 ft²
- BTU
- 170K
- Weight
- 1,100 lb
- Width
- 45 in
- Depth
- 31 in
- Height
- 65 in
- Manual firebox
- 28 gal, max log 19 in
- Automatic hopper
- 105 gal / 625 lb pellets
- Efficiency
- 92%
- Autonomy
- 4–10 days, up to 2 weeks depending on usage
- Certification
- EN 303-5:2012
Answers
Frequently asked questions
What is the Pellet Duo boiler?
Pellet Duo is a fully automatic, multi-fuel pellet boiler for hydronic heating, built around an auger-fed automatic hopper plus — on the 20/50/95 models — a manual firebox for backup or supplemental solid-fuel heat.
Which Pellet Duo size should I choose?
Pellet Duo 20 covers up to 3,000 ft², Pellet Duo 50 up to 6,200 ft², and Pellet Duo 95 up to 12,000 ft². For larger commercial or industrial loads, see the Pellet Duo Large/Industrial sizes (150–1000).
Is the Pellet Duo boiler fully automatic?
Yes — pellets, grains, corn, or biomass feed automatically through the auger-fed hopper. The 20/50/95 models also include a separate manual firebox as an optional backup fuel path, but automatic operation doesn't require it.
How much fuel does a Pellet Duo boiler use?
Fuel use depends on hopper size and usage. Regular-tier models (20/50/95) typically run 4–10 days of autonomy — up to two weeks — between refills.
What fuels can Pellet Duo boilers burn?
Wood pellets, grains, corn, or biomass through the automatic hopper, plus cut logs through the manual firebox on the 20/50/95 models.
Can a Pellet Duo boiler heat my whole house and domestic hot water?
Yes — Pellet Duo pairs with a domestic hot water tank such as the APOLLO DHW80 to cover both space heating and domestic hot water from the same boiler.
Can Pellet Duo boilers burn logs manually?
The Pellet Duo 20, 50, and 95 include a manual firebox in the specs table. This gives backup or supplemental solid-fuel flexibility.
How efficient is the Pellet Duo boiler?
Pellet Duo is rated at 92% efficiency and certified to EN 303-5:2012.
Do I need a buffer tank or boiler protection valve?
A buffer tank or boiler protection valve can help manage heat output and protect the system depending on your hydronic design. Confirm the right accessories for your installation with MBTEK.
What should I plan before installing a Pellet Duo boiler?
Plan for hopper refill access, venting, and hydronic connections sized to the model's manual-firebox and automatic-hopper dimensions. Confirm exact clearances and venting requirements with MBTEK before installation.
What maintenance does a Pellet Duo boiler need?
Routine maintenance includes ash removal, keeping the hopper supplied, and periodic cleaning and inspection per the controller manual's schedule.
How much does a Pellet Duo boiler system cost to run?
Running cost depends on fuel price and usage, but Pellet Duo's 92% efficiency and multi-fuel flexibility (pellets, grains, corn, or biomass) are designed to reduce cost per BTU versus wood, diesel, or oil heating.
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