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Stay Cool This Summer - 20% OFF Free Shipping 00d : 00h : 00m : 00s
PHOENIX 18, Compact Pellet Boiler, 61K BTU
Heating Capacity: Up to 2,500 ft² (other sizes available below)
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- High-efficiency pellet heatUp to 96% rated efficiency.
- Built-in pellet storageIntegrated hopper for extended operation.
- Automatic fuel modulationOutput adjusts to heating demand.
- Self-cleaning supportHelps reduce routine maintenance.
- Smart remote controlAndroid and Apple app access available.
Phoenix Pellet Boiler
Main Features
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96% pellet efficiency
Converts wood pellets into hydronic heat with up to 96% efficiency and low CO emissions.
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18, 35, or 50 kW heating choices
Choose Phoenix 18 for up to 2,500 ft2, Phoenix 35 for up to 4,500 ft2, or Phoenix 50 for up to 5,600 ft2 heating applications.
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Built-in hopper autonomy
The integrated 240 or 320 lb pellet hopper supports 3 to 10 days of autonomy per filling, depending on demand.
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Automatic startup and management
Automatic startup and management simplify daily operation for residential, workshop, garage, and light commercial hydronic systems.
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Easier self-cleaning maintenance
Integrated self-cleaning support helps keep routine maintenance straightforward and boiler performance consistent.
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Low-emission pellet heat
CO emissions are rated below 300 mg/m3, with A-class wood pellets recommended for stable operation.
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.
Technical specifications
Product-specific specifications for the Phoenix 18 pellet boiler, based on the official Phoenix Boiler Specifications sheet.
| Model / power | Phoenix 18 PWB18KW; 18 kW / 61,400 BTU |
|---|---|
| Heated area | Up to 2,500 ft2 |
| Efficiency | 96% |
| Weight | 320 kg / 705 lb |
| Dimensions | 600 W x 795 D x 1465 H mm / 23.6 W x 31.3 D x 57.6 H in |
| Hopper | 109 kg / 240 lb pellet hopper |
| Autonomy | Average autonomy per filling: 3 to 10 days |
| Chimney draft | 12 Pa |
| Chimney diameter | Minimum 160 mm / 6 in |
| Exhaust connection | 80 mm / 3 in |
| Water connections | Water input/output: 1 1/4 in |
| Temperature limits | Max flue gas temperature 150 C / 302 F; max water temperature 90 C / 194 F |
| Pressure / emissions / control | Water pressure 0.5-1.0 bar / 7.25-15 PSI; CO emissions <300 mg/m3; automatic start-up and management: Yes |
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, Phoenix 35, and Phoenix 50 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, 35, or 50?
Use the specs table as the source of truth: Phoenix 18 is listed for up to 2,500 sq ft, Phoenix 35 is listed for up to 4,500 sq ft, and Phoenix 50 is listed for up to 5,600 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 from the start, alongside the space-heating load, since it affects hopper refill frequency and peak output needs rather than being 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 much does it cost to run a Phoenix pellet boiler?
Running cost depends on pellet price, heat loss, climate, setpoints, and domestic hot water load, but Phoenix's up to 96% efficiency means more of every pellet's heat reaches your home instead of going up the flue. As a rough fuel comparison, burning 1 ton of wood pellets releases about as much heat as 3,527 lb of wood, 132 L of diesel fuel, or 181 L of oil. Compare fuel cost per delivered BTU alongside maintenance and installation quality when weighing Phoenix against oil, gas, or propane.
How long can the Phoenix hopper run between refills?
The specs table lists an average autonomy of 3 to 10 days per filling. Phoenix 18 and 35 use a 240 lb hopper, while Phoenix 50 uses a 320 lb hopper. 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.
How does Phoenix compare with ATLAS?
Phoenix and ATLAS are MBTEK's two compact pellet boiler lines, with closely overlapping BTU tiers — Phoenix 35 (120K, up to 4,500 ft2) covers nearly the same space as ATLAS 120K (up to 4,400 ft2). Phoenix costs more at every comparable tier, but adds self-cleaning support, app-based remote monitoring, and a higher efficiency rating (up to 96% vs. ATLAS's 94%+), plus a larger top tier — Phoenix 50 (170K BTU, up to 5,600 ft2) — that ATLAS doesn't offer. Both lines are wood-pellet-only, appliance-style units, distinct from the multi-fuel Pellet Duo platform. Confirm current pricing on the site, since promotions change.
