Froling Logo

Fröling P4 Automatic Wood Pellet Boiler

High Efficiency Commercial Pellet Boiler

The P4 automatic wood pellet boiler by Fröling is a proven performer!
Contact Us Today

p4 wood pellet boiler

The award-winning Fröling P4 automatic wood pellet boiler is one of the world's most advanced wood pellet boilers with lambda control. The best-in-class Fröling P4 wood pellet boiler has an award-winning, 10-year track record in the United States. Fröling P4 wood pellet boilers are a convenient and environmentally safe way to heat your space or water.

Remarkably high efficiency, low costs and convenience of using an abundant renewable fuel give P4 owners confidence in their appliance. With its ingenious, fully automated operation, this wood pellet boiler is amazingly easy to use. The P4 wood pellet boiler provides the convenience of gas or oil central heat with lower fuel bills. The boiler is covered by a five-year limited warranty.

Available models include:

• Fröling P4 Wood Pellet Boiler 48/60- 163,780-200,000 Btu/hr
• Fröling P4 Wood Pellet Boiler 80/100- 273,000-341,000 Btu/hr

Benefits of the Fröling P4 Pellet Boiler

From straightforward installation to high fuel efficiency, the Fröling P4 boiler provides several advantages compared to other boilers. We think you'll be impressed with all the benefits you'll receive from using the Fröling P4 pellet boiler system:

Easy fuel storage: A pair of two inch hoses transport fuel from the storage area to the boiler. Multiple pellet storage options can fit any space.

Carbon-neutral: The Fröling P4 produces very low emissions. Since it uses wood, which is a carbon-neutral fuel, the boiler is an environmentally-friendly and carbon-neutral heating option.

“Plug and Play” installation: The Fröling P4 is shipped fully assembled and ready for connection to plumbing and wiring..

Sound insulation: Special attention has been taken to ensure quiet operation.  Many people are surprised how quiet P4 boilers are compared to oil burners.

Convenient operation: Boiler refueling  and heat exchanger cleaning  are fully automated. Each time the boiler is turned on, the system self-tests to ensure safe operation.

Boiler efficiency: The three-part, multi-layer heat exchanger ensures high boiler efficiency by removing the ash and guaranteeing low emissions.

User-friendly control panel: The touch-screen control panel and optional room console make operation user-friendly and intuitive. Fröling also offers free computer software for monitoring and controlling the boiler.

Long life span: The boiler's durable construction contributes to allows it to operate for a long time, making it cost effective and low maintenance operation..


Which applications are ideally suited for Froling P4 pellet boilers?

The Fröling P4 boiler is a hot water boiler for hydronic and forced air heating in commercial and institutional applications. Whether you need to heat a large commercial warehouse, a school, a highway garage, multi-family building, or a large office building , the Fröling P4 is a low maintenance, economical, and environmentally friendly option.

P4 pellet boiler Cross Section

Commercial Ready

The Fröling P4 automatic wood pellet boiler, with its fully automated operation, can replace or supplement an oil or gas boiler in larger homes and commercial, industrial or institutional buildings. The Fröling P4 comes in two sizes with Btu/hr. ranges between 163,780 and 341,000 with the capability to cascade up to four boilers together. Self-cleaning features and large removable ash bins mean low maintenance.

The Fröling P4 100 wood pellet boiler is uniquely sized at 340,000 Btu/hr. From single boiler installations to four boilers in a cascade, the P4 100 has a proven track record as an economical, durable, high-efficiency performer. Please visit our blog to see many examples of commercial/institutional P4 wood pellet boiler installations in the United States.

The Fröling P4 Model 80/100 is ASME certified. ASME logo


Learn More - Downloadable Brochures

P4 Wood Pellet Boiler Brochure

PDF logo Fröling P4 Brochure - file size 3 Mb

P4 Wood Pellet Boiler Planning Guide

PDF logo Pellet Planning Guide - file size 4 Mb

P4 Wood Pellet Boiler Plumbing Schematics

PDF logo Plumbing Guide - file size 2 Mb

P4 Wood Pellet Boiler Advanced Features

PDF logo P4 Advantages - file size 861 Kb

Are you stoked

PDF logo Are You Stoked? - file size 91 Kb

Learn More - Videos

p4 pellet boiler fan

Speed-Regulated Draft Fan and Lambda Control

A speed-regulated fan combined with oxygen and temperature-based exhaust sensors allows Fröling wood pellet boilers to modulate output while remaining clean and efficient. The boiler can react to changing pellet fuel (harder/softer, more/less pitch, small/large pellets) while still remaining clean.

The use of oxygen control is less common, but it is the best way to ensure the cleanest burn possible. Standard large touch screens enable internet connectivity and the ability to view multiple functions at a single glance. Fröling controls track fuel use, maintenance and the function of all electric components.

p4 pellet boiler touch screen
p4 pellet boiler combustion

Automatic Ignition

All Fröling P4 Wood Pellet boilers have automatic ignition using a hot air gun that ignites the fuel quickly and effectively.

p4 pellet boiler ignition

Easy to Clean

Fröling wood pellet boilers self-clean the combustion grate and heat exchanger so that combustion is safe, clean and controlled while extracting as much heat as is possible from your valuable fuel. The innovative three-pass design allows complete combustion, ensuring low emissions. Ash is collected automatically into two large ash containers, which can be emptied easily. Our average boiler owner only empties the ash boxes three to five times per year, depending on the amount of fuel used.

p4 pellet boiler heat exchanger
p4 pellet boiler pellet feed

Industry-Leading Safety Concepts

P4 wood pellet boilers are inherently safe due to combustion zones being surrounded by water. Because regular use never requires access to combustion zones, there is no possibility for embers or fire to escape.

Fröling takes the safety concept to new levels by not only using hollow drop tubes to deliver fuel but also adding industry-leading double safety gates to isolate fuel storage from the combustion zone. It is impossible for both gates to be open during normal operation. The ingenious mechanical design coupled with advanced software ensures during self-testing that all components are ready before ignition is allowed.

p4 pellet boiler slide valve
froling connect
froling connect


Fröling Connect software allows free remote monitoring and control from web-enabled devices. You can read and modify the main status information and settings easily and conveniently online. It is also possible to store historic operating information and receive warnings such as when the ash box is full.

Fröling Connect allows the heating system owner to enable additional users like a family member, neighbor or service technician. Once the boiler is connected to the internet, the system can be accessed 24/7 from everywhere using a smartphone, tablet or PC with a web browser.

froling connect

Pellet Storage Integration

Several options are available for pellet storage, including:

Universal System: One, two, or three suction probes uniformly provide complete emptying of the storage room via the standard equipment vacuum feeder included on each boiler.

Suction Screw System: The Suction Screw System is ideal for rectangular rooms with front-end removal.  An auger carries fuel from the base of the bin to the vacuum pickup point, where pellets are then conveyed to the boiler using two, 2 inch hoses. Maximum hose run is 60’.

Bag Silo: The Bag Silo is pre-manufactured, flexible, simple and easy to assemble.  Fuel is conveyed from the base of the bag silo to the boiler using two, 2 inch hoses.  Maximum hose run is 60’

External Silo: An External Silo is great for commercial buildings or for use when there is inadequate interior space.

Optional Pellet Deduster

Project Summaries

Here are two working P4 Wood Pellet Boiler Project Summaries. For more project summary examples on pellet, wood chip, and cordwood boilers please click here.

Tarm Biomass Project Summary 2
Tarm Biomass Project Summary 1

Quality, Safety, and Performance

The Froling P4 Wood Pellet boiler has won many international quality awards in Europe and the USA.


The Blue Angel

Plus X Award-International


Innovation Award at Bois Energie-France

New Product of the Show Award-Ireland

P4 Pellet Boiler Features

The features of our P4 Pellet Boilers include:

• EPA Certified
• Safety Tested and Listed
• For Commercial Use
• Fully Automatic
• Bulk Fuel Ready


• Fully Factory Assembled
• Pneumatic Pellet Feed
• Lambda Controlled for Optimal Combustion
• Dual Safety Gates
• Cascade Control Available for Multiple Boilers


• Automatic Heat Exchange Cleaning
• Integrated Storage Tank Control
• Includes Solar Thermal Control
• Exhaust Temperatures Under 350 F
• Ash Boxes with Auger for Long Ash Removal Times

Discover Green Innovation Changing the Way We Stay Warm 

The Fröling P4 Wood Pellet Boiler from Tarm Biomass is an excellent solution to your residential or commercial heating needs. The Fröling P4 burns wood pellets efficiently, reduces carbon dioxide emissions and creates cost savings over a long operating life. With automatic ignition, mechanized cleaning, advanced safety features and simple user controls, the Fröling P4 boiler is an important innovation in heating.

Claim your energy independence and start saving. Contact us to learn more about how to stretch your wood fuel further with the Fröling P4 Wood Pellet Boiler.