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PELLET DUO 20 Pellet Boiler, 65K BTU - Warehouse Deal

Heating Capacity: Up to 3,000 ft²

Burns pellets, corn, grains, and biomass automatically — or wood logs manually

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Condition

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Phoenix boiler installed in a mechanical room with copper hydronic piping, pumps, and controls.
UNI wood boiler installed in a green mechanical room beside a vertical water storage tank.
MBTEK boiler system with a black and orange cabinet unit and orange hopper in a utility basement.
Black and orange boiler installed in a mechanical room with wall-mounted hydronic manifold, pumps, and control panel.
Black and orange boiler installed beside a water tank and hydronic piping in a basement mechanical room.
Black and orange pellet boiler connected to a black fuel hopper and auger in a finished mechanical room.
Black and orange pellet boiler connected to a black hopper and auger in an unfinished framed mechanical room.
Side view of an orange EKO Duo hybrid coal boiler and integrated fuel hopper in a concrete mechanical room.
Pellet Duo boiler with its combustion chamber and heat exchanger access doors open.
UNI wood boiler installation with water tank, copper piping, expansion tank, and manifold.
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

See how customers use MBTEK boilers in real homes, workshops, and large properties.

  • All-in-One controllerCalibrate and adjust your boiler without leaving the house
  • Energy savingDelivers heat comparable to wood, diesel, or oil
  • Multi-fuel flexibilityRuns on pellets, wood logs, corn, grains, or other biomass — not just wood pellets
  • Real-time monitoringTrack temperatures and refill needs as conditions change
  • Built for long-term reliabilityWill work flawlessly for years to come

MBTEK Pellet Duo Boiler

Main Features

  1. All-in-One Controller

    Calibrate and adjust your boiler without leaving the comfort of your house.

  2. Energy Saving

    Burning just 1 ton of pellets is released as much heat as: 3527lb of wood, 132L of diesel fuel, & 181L of oil.

  3. Certified Technology

    Over 65k units sold worldwide. EN 303-5 and EIN certified.

  4. Real-Time Monitoring

    Get instant feedback whenver temperatures change or feels needs to be refilled.

  5. Virtually Silent

    You won't hear it running from 10 feet away

  6. Technology you can rely on

    We offer a 10-year guarantee and sell spare parts so you can keep your equipment running long-term.

Pellet Duo boiler main features overview
Pellet Duo boiler installation example

Efficient Heating Solution

Optimized for a variety of fuels—including pellets, wood logs, corn, grains, and other biomass—the Pellet Duo features commercial-grade construction and a 6,200 ft² capacity, offering high-performance heating solutions for both large homes and commercial properties.

Convenient Control

Enjoy convenient control with the all-in-one controller of the Pellet Duo boiler. Calibrate and adjust settings without leaving your house, ensuring optimal performance with ease.

Energy Efficient

Save energy with Pellet Duo. Burning just 1 ton of pellets releases as much heat as 3527lb of wood, 132L of diesel fuel, and 181L of oil, providing efficient heating while reducing environmental impact.

Reliable Technology

Rely on certified technology with over 65k units sold worldwide and EN 303-5 and EIN certification. Benefit from real-time monitoring, virtually silent operation, and a 10-year guarantee with spare parts available for long-term reliability.

Technical specifications

Select a product-specific specs mapping block for this product.

Technical & User Manuals

This documentation covers many of the topics of interest to end-users and maintenance staff. For any additional inquiries, contact us.

PELLET DUO - Installation Manual

Installation guide for Pellet Duo boiler setup, piping, startup, and commissioning.

PELLET DUO - Controller Manual

Controller operating instructions, settings, menus, and programming guidance.

PELLET DUO - Boiler Manual

Full Pellet Duo boiler manual covering operation, maintenance, and safety guidance.

Product details

Warehouse Deal: One unit available at a reduced price due to cosmetic/shipping damage. Includes a new controller and full warranty.

Pellet Duo – 92% Efficiency Pellet Boiler (Up to 2 Weeks Autonomy)

High-performance automatic pellet boiler designed for maximum efficiency, long autonomy, and multi-fuel flexibility. Ideal for heating large homes 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, corn, grains, biomass)
  • Fully automatic operation with smart combustion control
  • Built with premium European materials

 

Specifications

  • Heating Capacity: Up to 3,000 ft²
  • Weight: 970 lb
  • Dimensions: 43" W × 24" D × 50" H
  • Automatic Hopper: 105 gal
  • Manual Firebox: 18 gal (logs up to 15")
  • Efficiency: 92%
  • Standards: EN 303-5:2012

Pellet Duo FAQ

Pellet Duo Boiler Frequently Asked Questions

Direct answers about Pellet Duo 20, 50, and 95 boilers, including sizing, fuel, hot water, installation, and maintenance.

What is the Pellet Duo boiler?

The Pellet Duo is an automatic wood pellet boiler for hydronic heating systems. It heats water for radiant floors, fan coils, air handlers, radiators, and indirect domestic hot water tanks when the system is designed for those loads.

Which Pellet Duo size should I choose?

Use the specs table as the source of truth for model coverage: Pellet Duo 20 is for up to 3,000 sq ft, Pellet Duo 50 for up to 6,200 sq ft, and Pellet Duo 95 for up to 12,000 sq ft. Final sizing should be based on heat loss, climate, insulation, ceiling height, domestic hot water demand, and hydronic design.

Is the Pellet Duo boiler fully automatic?

Yes. Pellet Duo runs on fully automatic operation with smart combustion control and an all-in-one controller, so ignition, fuel feed, and airflow are calibrated and adjusted without manual intervention. The Pellet Duo 20, 50, and 95 also keep a manual firebox available as backup or supplemental solid-fuel heat when you want it.

How much fuel does a Pellet Duo boiler use?

Fuel use scales with hopper size and heating demand. The Pellet Duo 20 (65K BTU, roughly 19 kW - the closest Pellet Duo match to a 20 kW pellet boiler) holds 442 lb of pellets, the Duo 50 (170K BTU) holds 625 lb, and the Duo 95 (330K BTU) holds 880 lb. Depending on outdoor temperature, insulation, and domestic hot water use, a full hopper typically lasts 4 to 10 days, up to about 2 weeks in mild conditions. Contact MBTEK for an estimated pellet consumption rate for your specific heating load.

What fuels can Pellet Duo boilers burn?

Pellet Duo boilers are designed for automatic pellet operation and can also support multi-fuel use such as pellets, grains, corn, and similar biomass fuels when configured correctly. Fuel quality, moisture, ash content, and local availability affect efficiency and maintenance.

Can a Pellet Duo boiler heat my whole house and domestic hot water?

Yes. A properly sized Pellet Duo can heat a whole building through hydronic distribution and can support domestic hot water through an indirect tank or approved system design. Domestic hot water demand should be sized alongside the space-heating load from the start, since it affects buffer tank sizing and peak output needs. The boiler, buffer tank, pumps, controls, and domestic hot water tank must be planned as one system.

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, but normal operation should follow the boiler manual, local code, and the installed control setup.

How efficient is the Pellet Duo boiler?

Pellet Duo boilers are listed at up to 92% efficiency and are built to the EN 303-5 standard. Actual efficiency depends on fuel quality, moisture content, chimney draft, cleaning, return-water protection, controls, and the hydronic system design.

Do I need a buffer tank or boiler protection valve?

Many pellet boiler systems benefit from thermal storage and boiler return-temperature protection. A buffer tank can reduce cycling, and a boiler protection valve helps protect the boiler from low return temperatures. Confirm the final layout with MBTEK or a qualified hydronic installer.

What should I plan before installing a Pellet Duo boiler?

Plan chimney draft, flue sizing, combustion air, clearances, hydronic piping, pumps, controls, thermal storage, fuel storage, and electrical service before ordering. Local code and installer requirements should guide the final mechanical room design.

What maintenance does a Pellet Duo boiler need?

Routine maintenance includes emptying ash, cleaning heat-transfer surfaces, checking the burner and hopper, inspecting gaskets and venting, and keeping pellets dry. Annual hydronic service should also check pumps, valves, controls, expansion tank, and water quality.

How much does a Pellet Duo boiler system cost to run?

Operating cost depends on pellet price, heat loss, climate, setpoints, domestic hot water load, and system design. Compare fuel cost per delivered BTU and include maintenance, buffer storage, and installation quality when comparing pellets with oil, gas, or propane.

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