Industrial wood chip boiler, 200–1,150 kW · PelleTech IDRO

Fully automatic and water-based, for pellets, wood chips and residues – with bio-oil as backup in the same boiler body.

The brochure, PDF4.3 MB · 24 pages

PelleTech IDRO 500 from the front: dark grey with a blue-green stripe and touchscreen, two ash boxes at the front and the feed with rotary valve on the right

200kW–4.6MWOutput range

PelleTech is now part of BWT

General agent in Scandinavia · Biotherm Heat AB

01Industrial heating

Heat that mustnever stop.

When a process, a greenhouse or a hotel depends on heat, the boiler has to run – around the clock, all year round. IDRO is built for exactly that.

Industry: Ideally fired with your own residues
Greenhouses: Many switch from gas, oil or electricity
Drying: Grain and other drying processes
Hotels and conferences: Where the heat supply must not fail

02Fuels

The fuel that'sclose at hand.

IDRO burns dry and moist fuels, even lower-quality ones, in one and the same boiler. Pellets and wood chips are the most common – but you are never tied to one fuel.

Fuel cost: approx.0.30SEK/kWh; Fuel only.
As backup: Bio-oil; In the same boiler body. No extra oil boiler needed.

PelleTech IDRO 500. Eight fuels lead into the rotary valve: pellets, wood chips, bark, logging residues, sawdust, waste wood, energy crops and residues.

Industry's residues become heat.

Wood chips from the forest, sawdust from the sawmill and industry's own residues: the fuel is renewable and often close at hand – and what is left over in production becomes heat on site.

Most common: PelletsVarious standards, including pellets made from residues.
Most common: Wood chips and wood fuelsAll tree species with bark, sawdust, logging residues and waste wood.
From industry: ResiduesWet and dry, from sawmills, furniture, chipboard and pallets.
From cultivation: CropsEnergy crops and crop residues.
From farming: Agricultural residuesDried residues, such as shredded straw.

03Exploded view

Part by part.

The casing, door, ash boxes and feed system of the IDRO 500 – plus the firebox and stepped grate, which sit inside the boiler. Point at a part to see what it does.

Exploded front view of PelleTech IDRO 500: the flue gas fan, the casing with the touchscreen on the blue-green stripe, the firebox door, the two ash boxes, the rotary valve and the stoker screw; the firebox and stepped grate pulled out at the top right

Frequency-controlled, for the right draught through the boiler.
On the front: temperature, output, fuel and oxygen content.
Sensors and ceramics are accessed through simple hatches.
100 and 84 litres, for the firebox and convection section.
Ceramic-lined and water-cooled.
Moving. Slides out on a rail for servicing.
Protects against burn-back and shears off long sticks.
Feeds the fuel in. Energy-efficient motor and gearbox.

04The cascade

Four boilers.One plant.

Up to four boilers work together. Four IDRO 500 boilers deliver up to 2 MW – four IDRO 1150 boilers up to 4.6 MW.

Boilers in cascade

Choose the number of boilers – with the mouse or the arrow keys.

With IDRO 500 · 500 kW per boiler

1234

2MW

With IDRO 1150 · 1,150 kW per boiler

1234

4.6MW

Start and stop: The cascade control starts and stops the boilers as demand requires.
Operating hours: Spread evenly between the boilers.
Accumulator tanks: Managed by the same control system.

Need less than 200 kW? See all wood chip boilers, from 20 kW

05How IDRO works

How fuelbecomes heat.

The fuel burns out on the grate, and the heat passes into the boiler water. The ash screws carry the ash out of the firebox and convection section.

1Boiler waterThe flue gases give up their heat to the water. 1,100 litres in an IDRO 500.
2Convection sectionVertical tubes. The turbulators keep the tubes clean and make the gases swirl.
3Stepped grateMoving. The fuel dries, burns out and turns to ash.
4FireboxCeramic-lined and water-cooled.
5Rotary valve and stoker screwFuel in. The rotary valve protects against burn-back and shears off long sticks – the stoker screw feeds the fuel onto the grate.

PelleTech IDRO in the 2025 design: dark grey with a blue-green stripe and touchscreen, two ash boxes at the front and the feed with rotary valve on the right

The same boiler in cross-section: the flame above the stepped grate in the ceramic-lined firebox, the boiler water around the firebox and tubes, the upright tubes with turbulators and the stoker screw from the rotary valve

06Combustion

A grate thatis never still.

The grate is made of high-chromium cast iron. Its bars move back and forth, and slightly up and down, breaking up the fuel bed and carrying the fuel forward until only ash remains. That is why IDRO also handles wetter and lower-quality fuels – with no risk of sintering.

01
Drying zone
The fuel dries where it enters the grate.
02
Combustion zones
The bed is kept moving and burns out zone by zone.
03
Ash
Drops into the ash screw and is removed automatically.

The firebox with ceramic walls, the moving stepped grate and the ash screw at the bottom

07The rest of the boiler

More features.

From ignition to flue gases.

EfficiencyUp to 94.6 %, according to PelleTech.

In operation

Built for long operating periods. The grate and convection section are cleaned automatically, and the ash is removed on its own. When servicing is needed, it is quick.

Grate
High-chromium cast iron. Pulls out of the boiler in under 15 minutes.
Energy-efficient feed
The stoker screw's gearbox and motor draw 0.37 kW.
Hot-air igniter
Fast ignition at 1,600 W. Replaceable ignition elements.
Lambda sensor
Measures the oxygen content and adjusts combustion.

Burner: Out for maintenance in around 10 minutes
Sensors: Accessed through simple hatches
Ash boxes: 100 and 84 litres – the boiler alarms when they need emptying
Cleaning: Automatic, in grate and convection section

08Options

Cleaner flue gases,easier ash.

Option

Electrostatic filter

Built into the boiler beneath the convection section – no external filter unit. Lower cost and more compact.

Option

Cyclone

Separates dust from the flue gases, with a container below.

Option · 2 × 0.37 kW

Central ash discharge

An inclined screw lifts the ash all the way out of the boiler room, into a shared container.

09Control and connectivity

From the boiler roomto your phone.

The touchscreen sits on the boiler. With the app or via Modbus, you can monitor and control IDRO remotely – and alarms reach you directly.

1 · Boiler room
Touchscreen
Temperature, output, fuel and oxygen content.
2 · Your system
Modbus
Monitor and control from your own system.
3 · On your phone
The app
Phone or tablet.
4 · With us
Biotherm
Alarms, remote monitoring and remote control.

Alarms reach you directly.

Monitor and control the boiler remotely, wherever you are. An internet connection for alarms and information is available as an option – and the cascade control runs several boilers and the accumulator tanks in one system.

The values shown are examples.

10Peace of mind, around the clock

Safe, aroundthe clock.

Safety is built in – from the rotary valve that shuts out burn-back to the flue gas fan that keeps the draught right. And the boiler tells you itself when it needs servicing.

11Add-ons

Everything around it.

The boiler is part of the plant. Shredder, heating plant and fuel store come from us – engineered, installed and serviced, with one contact all the way.

Each store is designed around your conditions and wishes – the site, the fuel and how you want to fill it. Besides PelleTech's solutions, we manufacture a range of fuel stores ourselves.

12Sizes and data

Eight sizes.

Seven from 200 to 500 kW, plus a larger boiler of 700–1,150 kW. Every plant is engineered for its specific task.

Dimension drawing of IDRO from the front with feeder and ash boxes

Dimensions and technical data for IDRO, by output in kW
Output, kW	200	250	300	350	400	450	500	700–1,150
Dimensions, mm								Data on request
Boiler length	2,090	2,295	2,295	2,604	2,604	2,604	2,604
Flue gas side	332	332	332	462	462	462	462
Chip feeder	896	896	896	896	896	896	896
Boiler depth	1,214	1,299	1,299	1,491	1,491	1,491	1,491
Depth with ash boxes	1,515	1,600	1,600	1,793	1,793	1,793	1,793
Overall height	2,101	2,216	2,216	2,414	2,414	2,414	2,414
Boiler height	1,899	2,011	2,011	2,145	2,145	2,145	2,145
Technical data
Water volume, litres	617	772	772	1,100	1,100	1,100	1,100
Operating pressure min/max, bar	1.5/4	1.5/4	1.5/4	1.5/4	1.5/4	1.5/4	1.5/4
Max. operating temperature, °C	95	95	95	95	95	95	95
Flow and return	3″ DN 80	3″ DN 80	3″ DN 80	4″ DN 100	4″ DN 100	4″ DN 100	4″ DN 100
Filling and draining	1¼″ DN 32	1¼″ DN 32	1¼″ DN 32	1¼″ DN 32	1¼″ DN 32	1¼″ DN 32	1¼″ DN 32
Minimum flow, t 15 K, kg/h	11,400	14,250	17,150	19,990	22,850	25,700	28,600
Accumulator tank, min., litres	3,000	4,000	4,000	5,000	5,000	5,000	5,000
Heat exchanger surface, m²	12.48	14.9	14.9	25.43	25.43	25.43	25.43
Flue gas tubes, Ø 70, pcs	64	72	72	132	132	132	132
Grate combustion area, m²	0.24	0.375	0.375	0.617	0.617	0.617	0.617
Firebox volume, m³	0.08	0.15	0.15	0.3	0.3	0.3	0.3
Ash boxes, firebox/convection, litres	100/84	100/84	100/84	100/84	100/84	100/84	100/84
Flue pipe, Ø mm	250	250	250	300	300	300	300
Boiler weight, kg	1,950	2,500	2,500	3,200	3,200	3,200	3,200

Dimensions apply to 200–500 kW with chip feeder. Data according to PelleTech's technical specification, subject to change. Final data for your plant is provided at the design stage.

Planned from the first drawing.

Biotherm designs and engineers the boiler room in 3D (IRONCAD) and handles installation, commissioning and fine-tuning.

Power supply: 400 V · 20 A
Flue pipe: Ø 250–300 mm
Accumulator tank, min.: 3,000–5,000 litres
Boiler weight: 1,950–3,200 kg

Minimum clearances around the boiler, 200–500 kW

In front: 1,000–1,250 mmat the ash boxes
Feeder side: 1,300 mm
Flue gas side: 600–800 mm
Behind: 700 mm
Above: 650–700 mm

The larger boiler

700–1,150 kW.

For the largest needs, IDRO comes as a larger boiler of 700–1,150 kW – and with four 1,150 kW boilers in cascade, a plant reaches up to 4.6 MW. Dimensions and data on request; every plant is engineered for its specific task.

Part of

13PelleTech and BWT

PelleTech is now part of BWT.

PelleTech, which manufactures Multiauto, IDRO, AERO and BU, has been acquired by BWT, Best Water Technology. Biotherm Heat AB is the general agent for PelleTech in Scandinavia.

BWT founded: 1990
Employees: 6,500+
Countries: 120+
Factories: 13

The brochure

Everything about IDRO in one brochure.

PDF · 24 pages · 4.3 MB

Download På svenska (PDF, 4,3 MB)

Free heat-load calculation

Let's calculate your heating.

Tell us what needs heating and which fuel you have close at hand, and we will calculate IDRO for you – one boiler or several in cascade.

Call +46 (0)921-578 00

info@biothermheat.comVästerås · Luleå

Industrial wood chip boiler, 200–1,150 kW · PelleTech IDRO

Heat that mustnever stop.

The fuel that'sclose at hand.

Industry's residues become heat.

Part by part.

Four boilers.One plant.

How fuelbecomes heat.

A grate thatis never still.

Drying zone

Combustion zones

Ash

More features.

Grate

Energy-efficient feed

Hot-air igniter

Lambda sensor

Cleaner flue gases,easier ash.

Electrostatic filter

Cyclone

Central ash discharge

From the boiler roomto your phone.

Touchscreen

Modbus

The app

Biotherm

Alarms reach you directly.

Safe, aroundthe clock.

Everything around it.

Eight sizes.

Planned from the first drawing.

700–1,150 kW.

PelleTech is now part of BWT.

Everything about IDRO in one brochure.

Let's calculate your heating.

Let's calculate your heating.

We will be in touch.

Choose what may be loaded and stored.