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PHOENIX Series — Compact, High-Efficiency, Self-Cleaning
PHOENIX 35, Compact Pellet Boiler, 120K BTU
Heating Capacity: Up to 4,500 ft²
Mid-size Phoenix for larger homes, garages, and workshops needing automated pellet-only hydronic heat.
Model
PHOENIX 35 · 120K BTU · Up to 4,500 ft²
$8,205
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Installed in real homes and workshops
Customer Success Stories
Hey, my name is Eric from Michigan with my MBTE 50 Phoenix boiler. This is the 170K unit. I'm using this for in-floor heat in my Barndominium, which is a 3,000 square foot home here in Michigan, which gets down to 5 degrees. And this just keeps up with my home. It does no problem heating a big two-story 3,000 square foot home. I love it. If you're looking to be off-grid, this is a good option for you.
Keeps my home warm with no problem, even at 5 degrees
Hear how Eric from Michigan heats his 3,000 sq. ft. Barndominium with a Phoenix pellet boiler.
Product details
- Up to 96% efficiency
- Built-in pellet hopper
- Automatic fuel modulation
- Self-cleaning support
Phoenix Pellet Boiler – 120,000 BTU / 35 kW
High-efficiency pellet boiler designed as a compact, powerful, and technologically advanced heating solution for larger homes, workshops, garages, and commercial hydronic heating applications.
With up to 96% efficiency, a large built-in pellet hopper, automatic fuel modulation, and remote control capability, the Phoenix boiler delivers strong heating performance with simple maintenance.
Key Benefits
- High-efficiency performance with up to 96% efficiency
- 120,000 BTU / 35 kW heating capacity for areas up to 4,500 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: 120,000 BTU / 35 kW
- Recommended Area: Up to 4,500 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: 794 lbs
- Dimensions: 24.75" W x 31.15" D x 59.5" H
- Exhaust Pipe: 4" / 102 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
| Output / area | 35 kW / 120,000 BTU, up to 4,500 ft² |
|---|---|
| Efficiency | 96% |
| CO emissions | Below 300 mg/m³ |
| Hopper | 109 kg / 240 lb, 3–10 days autonomy |
| Dimensions | 630W × 791D × 1510H mm (24.75 × 31.15 × 59.5 in) |
| Weight | 360 kg / 794 lb |
| Chimney draft | 12 Pa, minimum diameter 160 mm / 6 in |
| Water connections | 1 1/4 in in/out |
| Exhaust | 102 mm / 4 in |
| Water pressure | 0.5–1.0 bar / 7.25–15 PSI |
| Maximum water temperature | 90°C / 194°F |
| Warranty | 2-year parts |
- Output / area
- 35 kW / 120,000 BTU, up to 4,500 ft²
- Efficiency
- 96%
- CO emissions
- Below 300 mg/m³
- Hopper
- 109 kg / 240 lb, 3–10 days autonomy
- Dimensions
- 630W × 791D × 1510H mm (24.75 × 31.15 × 59.5 in)
- Weight
- 360 kg / 794 lb
- Chimney draft
- 12 Pa, minimum diameter 160 mm / 6 in
- Water connections
- 1 1/4 in in/out
- Exhaust
- 102 mm / 4 in
- Water pressure
- 0.5–1.0 bar / 7.25–15 PSI
- Maximum water temperature
- 90°C / 194°F
- Warranty
- 2-year parts
Answers
Frequently asked questions
What is the Phoenix Pellet Boiler?
Phoenix is a compact mono-block hydronic boiler that automatically feeds and modulates A-class wood pellets. It combines a built-in hopper, self-cleaning support, and Android/Apple app control.
Should I choose Phoenix 18, 35, or 50?
Phoenix 18 covers up to 2,500 ft², Phoenix 35 up to 4,500 ft², and Phoenix 50 up to 5,600 ft². Square-footage ranges are approximate; final sizing depends on heat loss, insulation, climate, and system design.
Can Phoenix heat domestic hot water?
Yes — Phoenix can support domestic hot water when connected to a correctly sized indirect water heater tank as part of the hydronic system.
How efficient is the Phoenix Pellet Boiler?
Phoenix is rated at up to 96% efficiency, depending on model and operating conditions.
How much does it cost to run a Phoenix pellet boiler?
Operating cost depends on local pellet price, building heat loss, weather, and setpoints. Phoenix's automatic modulation and up-to-96% efficiency are designed to reduce wasted fuel, but a site-specific estimate requires actual load and fuel-cost data.
How long can the Phoenix hopper run between refills?
Published autonomy is 3–10 days. Actual refill frequency depends on model, hopper size, outdoor temperature, building load, and operating schedule.
What fuel does Phoenix use?
Phoenix requires A-class wood pellets. It is pellet-only, not the multi-fuel platform used by Pellet Duo.
What does self-cleaning mean on Phoenix?
Self-cleaning support reduces routine hands-on ash and combustion-area maintenance. It does not eliminate periodic inspection, ash removal, flue cleaning, or scheduled professional service.
What installation requirements matter for Phoenix?
Plan model-specific boiler-room space, chimney draft and diameter, combustion air, electrical service, hydronic connections, water pressure, and service access. Final installation must follow the Phoenix installation guide and local codes.
How does Phoenix compare with Pellet Duo?
Phoenix emphasizes a compact layout, pellet-only operation, self-cleaning support, and app control. Pellet Duo is the fuel-flexible choice: it can automatically burn pellets, grains, corn, or biomass, and selected models also include a manual log firebox.
How does Phoenix compare with ATLAS?
Both are compact pellet boilers. Phoenix offers a larger hopper, up to 96% efficiency, self-cleaning support, and app control; ATLAS is the lower-cost, appliance-style option with a 99 lb hopper and over 94% efficiency.
MBTEK Google Reviews
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