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EKO DUO 35 Hybrid Coal Boiler, 130K BTU

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Hybrid Coal Boiler — EKO DUO

EKO DUO 35 Hybrid Coal Boiler, 130K BTU

Heating Capacity: Up to 4,000 ft²

Automatic multi-fuel hybrid coal heat for homes and mid-size hydronic projects.

Model
EKO DUO 35 - 130K BTU · Up to 4,000 ft²
$9,120
$7,29620% OFF

Shipping$1,550Free

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What EKO DUO 35 Hybrid Coal Boiler, 130K BTU Works With

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  • UNI wood boiler installed in a green mechanical room beside a vertical water storage tank.
  • UNI wood boiler installed beside an expansion tank and copper hydronic piping in a mechanical room.
  • UNI wood boiler installed with copper hydronic piping, pumps, valves, and temperature controls.
  • MBTEK boiler system with a black and orange cabinet unit and orange hopper in a utility basement.
  • Side view of an orange EKO Duo hybrid coal boiler and integrated fuel hopper in a concrete mechanical room.
  • Side view of an EKO Duo boiler with closed access doors and digital controller in a mechanical room.

Installed in real homes and workshops

Customer Success Stories

I love the modern control panel on my Eko series boiler. It takes all the guesswork out of the burning process. It's surprisingly simple to dial in the settings, and it manages the heat perfectly. Total peace of mind.

Simple, Smart Heating Control

Intuitive screen and straightforward settings make operation effortless.

Product details

  • Multi-fuel versatility
  • Extended autonomy
  • True hybrid system
  • Smart continuous cycle

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
Capacity (modulation range)
51–137 KBTU
Heat area
Up to 4,000 ft²
Relief valve
30 psi
Water volume
32 gal
Connection
1½ in
Chimney
6 in
Hopper volume
111 gal

Complete the system

What EKO DUO 35 Hybrid Coal Boiler, 130K BTU Works With

APOLLO DHW80 - Stainless Indirect Water Heater Tank - 80gal

Water heater tank

Store heat and make hot water

The combined buffer and indirect tank stores boiler heat and supplies household hot water — no separate water heater needed.

View details
Model
DHW80 · 80 gal
$2,912.50
$2,33020% off

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Complete your system

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