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PHOENIX 18, Compact Pellet Boiler, 61K BTU

Heating Capacity: Up to 2,500 ft²

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  • Up to 96% efficiencyHigh-efficiency pellet heat.
  • 18 or 35 kW outputTwo Phoenix capacities.
  • 240 lb built-in hopper3 to 10 days autonomy.
  • Self-cleaning operationSimpler routine maintenance.
  • App-ready controlRemote module compatible.

Phoenix Pellet Boiler

Main Features

  1. 96% pellet efficiency

    Converts wood pellets into hydronic heat with up to 96% efficiency and low CO emissions.

  2. 18 or 35 kW heating choices

    Choose Phoenix 18 for up to 2,500 ft2 or Phoenix 35 for up to 4,500 ft2 heating applications.

  3. Built-in hopper autonomy

    The integrated 240 lb pellet hopper supports 3 to 10 days of autonomy per filling, depending on demand.

  4. Automatic startup and management

    Automatic startup and management simplify daily operation for residential, workshop, garage, and light commercial hydronic systems.

  5. Easier self-cleaning maintenance

    Integrated self-cleaning support helps keep routine maintenance straightforward and boiler performance consistent.

  6. Low-emission pellet heat

    CO emissions are rated below 300 mg/m3, with A-class wood pellets recommended for stable operation.

Phoenix pellet boiler front view
Phoenix pellet boiler application image

Compact mono-block layout

The pellet tank is built directly over the heat exchanger, keeping the Phoenix footprint compact for utility rooms, garages, and mechanical spaces.

Remote app-ready control

A smart remote control module enables Android and Apple app access for convenient boiler monitoring and adjustments.

Low-maintenance pellet heating

Automatic fuel modulation, built-in hopper capacity, and self-cleaning support reduce daily handling compared with manual solid-fuel systems.

Hydronic heating fit

Designed for water-based heating systems with operating pressure from 0.5 to 1.0 bar and maximum water temperature of 90 C / 194 F.

Installed in real homes and workshops

Customer Success Stories

See how customers use MBTEK products in real projects.

Technical specifications

Comparison specifications for Phoenix 18 and Phoenix 35 pellet boilers, based on the official Phoenix Boiler Specifications sheet.

Product family Phoenix 18 PWB18KW / Phoenix 35 PWB35KW wood pellet boiler
Output and heated area Phoenix 18: 18 kW / 61,400 BTU, up to 2,500 ft2; Phoenix 35: 35 kW / 120,000 BTU, up to 4,500 ft2
Efficiency and emissions 96% efficiency; CO emissions below 300 mg/m3
Hopper and autonomy 109 kg / 240 lb pellet hopper; average autonomy per filling: 3 to 10 days
Dimensions Phoenix 18: 600 W x 795 D x 1465 H mm / 23.6 W x 31.3 D x 57.6 H in; Phoenix 35: 630 W x 791 D x 1510 H mm / 24.75 W x 31.15 D x 59.5 H in
Weight Phoenix 18: 320 kg / 705 lb; Phoenix 35: 360 kg / 794 lb
Chimney and connections 12 Pa chimney draft; minimum chimney diameter 160 mm / 6 in; water input/output 1 1/4 in; exhaust 80 mm / 3 in on Phoenix 18 and 102 mm / 4 in on Phoenix 35
Operating limits and warranty Water pressure 0.5-1.0 bar / 7.25-15 PSI; maximum water temperature 90 C / 194 F; 2-year parts warranty

Use A-class wood pellets only and follow the installation guide for chimney, clearance, pressure, and safety requirements.

Product documents

Download the current Phoenix installation guide and specifications sheet.

Phoenix Installation and Maintenance Guide

Installation, startup, exploitation, and maintenance guidance for Phoenix pellet boilers.

Phoenix Boiler Specifications

Official technical specifications for Phoenix 18, Phoenix 35, and Phoenix 50 pellet boilers.

Product details

Phoenix Pellet Boiler – 61,400 BTU / 18 kW

High-efficiency pellet boiler designed as a compact, powerful, and technologically advanced heating solution for homes, workshops, garages, and hydronic heating applications.

With up to 96% efficiency, a built-in pellet hopper, automatic fuel modulation, and remote control capability, the Phoenix boiler delivers reliable heating performance with simple maintenance.

 

Key Benefits

  • High-efficiency performance with up to 96% efficiency
  • 61,400 BTU / 18 kW heating capacity for areas up to 2,500 ft²
  • Compact mono-block design with the pellet tank built directly over the heat exchanger
  • Integrated self-cleaning system for easier maintenance
  • Large 240 lb hopper capacity for 3 to 10 days of autonomy, depending on energy demand
  • Programmable operation so you can decide when the boiler turns on or off
  • Smart remote control module with Android and Apple app access
  • Automatic fuel modulation for efficient operation and low emissions
  • Made in Europe using an ISO-9001 automated manufacturing process
  • Tested before shipping with vacuum pressure and water testing
  • 2-year parts warranty included

 

Specifications

  • Heating Capacity: 61,400 BTU / 18 kW
  • Recommended Area: Up to 2,500 ft²
  • Efficiency: Up to 96%
  • Fuel Type: Wood pellets only
  • Hopper Capacity: 240 lbs of pellets
  • Autonomy: 3 to 10 days, depending on energy demand
  • Weight: 705 lbs
  • Dimensions: 23.6" W x 31.3" D x 57.6" H
  • Exhaust Pipe: 3" / 80 mm
  • Minimum Chimney Diameter: 6" / 160 mm
  • Max Water Temperature: 90°C / 194°F
  • Working Pressure: 0.5 to 1.0 bar / 7.25 to 15 PSI
  • Emissions: Low CO emissions, less than 300 mg/m³
  • Origin: Made in Europe
  • Warranty: 2-year warranty on parts

Phoenix FAQ

Phoenix Pellet Boiler Frequently Asked Questions

Answers about Phoenix 18 and Phoenix 35 pellet boilers for compact hydronic heating systems.

What is the Phoenix Pellet Boiler?

Phoenix is a compact high-efficiency wood pellet boiler for hydronic heating systems. It heats water for radiant floors, radiators, fan coils, air handlers, and indirect domestic hot water tanks when the system is designed for those loads.

Should I choose Phoenix 18 or Phoenix 35?

Use the specs table as the source of truth: Phoenix 18 is listed for up to 2,500 sq ft, while Phoenix 35 is listed for up to 4,500 sq ft. Final sizing should be based on heat loss, climate, insulation, water temperature, domestic hot water demand, and hydronic design.

Can Phoenix heat domestic hot water?

Yes, Phoenix can support domestic hot water through an indirect tank or approved hydronic design. Domestic hot water demand should be included in the system sizing instead of treated as a separate afterthought.

How efficient is the Phoenix Pellet Boiler?

Phoenix is rated up to 96% efficiency. Real-world performance depends on pellet quality, chimney draft, hydronic water temperatures, cleaning, controls, and installation quality.

How long can the 240 lb hopper run between refills?

The specs table lists an average autonomy of 3 to 10 days per filling. Actual runtime depends on outdoor temperature, heat loss, setpoints, domestic hot water use, pellet quality, and how often the boiler runs at high output.

What fuel does Phoenix use?

Phoenix is designed for quality A-class wood pellets. It is not the same multi-fuel platform as Pellet Duo, so fuel quality and pellet storage are important for stable operation.

What does self-cleaning mean on Phoenix?

Self-cleaning support helps reduce routine cleaning work and helps keep performance consistent. It does not eliminate ash removal, vent inspection, pellet storage care, or annual hydronic service.

What installation requirements matter for Phoenix?

Plan chimney draft, combustion air, clearances, operating pressure, water temperature, pumps, controls, expansion tank, and code requirements before installation. A qualified installer should confirm venting and hydronic layout for the building.

How does Phoenix compare with Pellet Duo?

Phoenix is a compact, self-cleaning, wood-pellet-only boiler for homes, garages, workshops, and light commercial hydronic systems. Pellet Duo offers larger outputs, multi-fuel flexibility, and manual firebox options for projects that need more capacity or fuel flexibility.

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