Need an installer?We made it easy for you.
Listed installers are independent contractors, not MBTEK employees. They're skilled professionals familiar with our products and capable of efficient installation.

1 / 5
Hybrid Coal Boiler — EKO DUO
Heating Capacity: Up to 9,000 ft²
Largest regular-tier EKO DUO for large homes and mid-size commercial hydronic projects.
Shipping$2,241Free
Need help choosing?






Installed in real homes and workshops
We replaced our aging system with this MBtek wood boiler and the savings were immediate. It burns so efficiently, we're using significantly less wood to get much more consistent, powerful heat. It's transformed our monthly budget.
Slash Your Heating Bills
Maximize savings with high-efficiency automated wood chip combustion.
High-output automatic self-cleaning Hybrid Coal Boiler for demanding hydronic systems, combining extended hopper capacity with the EKO DUO multi-fuel combustion platform.
| Capacity (modulation range) | 154–338 KBTU |
|---|---|
| Heat area | Up to 9,000 ft² |
| Relief valve | 30 psi |
| Water volume | 46 gal |
| Connection | 2 in |
| Chimney | 8 in |
| Hopper volume | 238 gal |
Verified Google reviews from MBTEK customers across our heating and hydronic product lines.
Loading reviews…
Need an installer?We made it easy for you.
Listed installers are independent contractors, not MBTEK employees. They're skilled professionals familiar with our products and capable of efficient installation.
Any questions?Reach out to us.
Our team can help with product questions, sizing guidance, and next steps.