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EKO DUO 35 Hybrid Coal Boiler, 130K BTU

Heating Capacity: 4,000 ft²

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$9,607.28 $8,646.55
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  • Multi-Fuel VersatilityEffortlessly burns coal, pellets, grains, and manual wood logs.
  • Extended AutonomyMassive hopper capacity provides up to 2 weeks of automated heating.
  • True Hybrid SystemFeatures both an automated stoker and a spacious manual firebox.
  • Smart Continuous CycleIntelligently keeps hot ashes to seamlessly auto-ignite the next fire.
  • Premium European BuildRugged, heavy-duty construction manufactured in Europe for extreme durability.

MBTEK EKO DUO Hybrid Boiler

Main Features

  1. Automatic, Self-Cleaning Boiler

    Eko Duo is a state-of-the-art automatic coal boiler with a modern, self-cleaning rotary cast iron burner.

  2. Flexible Multi-Fuel Capability

    Automatically burns coal, pellets, grains, and biomass up to 1½", plus manual feeding for wood chips and peat briquette.

  3. High Energy Efficiency

    Unique design ensures complete heat recovery, guaranteeing 90% operational efficiency.

  4. Smart TIS tronic 481R Control

    Intelligent controller manages combustion based on parameters, weather, and fuel, adapting to modern hydronic systems.

  5. Extended 4-10 Day Autonomy

    Large hopper and automation provide significant operational autonomy, with comprehensive system control features.

  6. Durable & Easy Maintenance

    Built with certified ASTM A106 steel, offering wide access for simple, front-only cleaning and long-term, trouble-free use.

EKO DUO small boiler main features overview
EKO DUO small boiler product overview

Multi-Fuel Versatility

The Eko Duo's automatic burner efficiently handles coal, pellets, grains, and other biomass up to 1½". For even more flexibility, the middle chamber allows for manual feeding of coal, wood chips, peat briquette, and various other biomass types, adapting to your available fuel sources.

Superior 90% Efficiency

Experience significant energy savings with the Eko Duo's guaranteed 90% efficiency. Its unique design is engineered for complete heat recovery, ensuring optimal heat utilization and reducing fuel consumption while delivering powerful heating performance.

Intelligent TIS tronic Control

The advanced TIS tronic 481R controller intelligently masters combustion, adapting to user settings, weather, and fuel quality. It seamlessly integrates with modern hydronic heating systems, offering functions for pumps, mixing valves, buffer tanks, and providing 4 to 10 days of autonomous operation.

Robust Build & Easy Maintenance

Built from top-quality ASTM A106 certified boiler steel, the Eko Duo ensures long-term, trouble-free performance. Its wide door openings allow easy cleaning of the heat exchanger and ash removal, with all maintenance conveniently front-accessible, requiring no unscrewing.

Installed in real homes and workshops

Customer Success Stories

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Technical specifications

Product-specific specifications for the EKO DUO 35 boiler.

Capacity 51 – 137 KBTU
Heat area 4,000 ft²
Relief valve 30 psi
Water volume 32 gal
Connection 1 1/2 in
Chimney 6 in
Hopper volume 111 gal
Hopper width 31 in
Boiler width 27 in
Boiler depth 34 in
Boiler height 56 in
Boiler weight 1,300 lb

Product documents

Access the official product documentation below.

EKO DUO Hybrid Boiler Manual

Full EKO DUO Hybrid Boiler manual covering operation, maintenance, and safety guidance.

Product details

EKO DUO 35 Hybrid Coal Boiler, 130K BTU

Automatic self-cleaning Hybrid Coal Boiler for mid-size hydronic heating systems, designed to pair strong output with multi-fuel flexibility and advanced EKO DUO combustion control.

 

Key Benefits

  • Automatic self-cleaning burner with rotary cast iron design for reliable solid-fuel combustion
  • Flexible multi-fuel capability for coal, pellets, grains, and biomass up to 1 1/2", plus manual feeding for wood chips and peat briquette
  • Guaranteed 90% efficiency with a design focused on complete heat recovery
  • TIS tronic 481R controller manages combustion, pumps, mixing valves, storage, and hydronic operating modes
  • Extended autonomy from the automated hopper and ignition strategy reduces day-to-day intervention
  • Front-access maintenance with ASTM A106 boiler steel construction and wide cleaning access

 

Specifications

  • Heating Capacity: 130,000 BTU
  • Recommended Area: 4,000 ft²
  • Automatic Fuel Range: Coal up to 1 1/4"; also burns pellets, grains, and biomass
  • Manual Firebox: 22 gal with up to 19" logs
  • Hopper Volume: 111 gal / 902 lb of coal
  • Dimensions / Weight: 58" W x 34" D x 56" H; 1,300 lb
  • Coal Types: Anthracite and bituminous; rice, buckwheat, pea, and stoker sizes
  • Warranty: 10 years

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