Wood-chip version
Fed from a separate store, with rotary valve and stoker screw.
- Total width A1
- 1,208–1,481 mm
- Chip size
- G50+
Wood chip boiler 20–200 kW · PelleTech Multiauto
Automatic heat from wood chips and many other fuels – for properties, farms and smaller industry.
20–200kWOutput range
PelleTech is now part of BWT
General agent in Scandinavia · Biotherm Heat AB
01Fuels
One boiler,many fuels.
Wood chips, pellets and firewood – but also sawdust, wood shavings, logging residues, peat and other residues. Most of our customers burn wood chips or similar material.
- Fuel cost
- approx.0.30SEK/kWh
- Bought-in wood chips, approximate, based on the fuel.
- Your own forest
- 0.15–0.20SEK/kWh
From the farm to smaller industry.
Multiauto is the right fit where you want to burn the fuel that is cheapest and easiest to obtain.
- Properties
- Homes, schools and premises with their own boiler room.
- Farms
- Ideally with wood chips from your own forest.
- Smaller industries
- Several boilers in cascade for greater demand.
02Stepped grate
At heart,industrial.
The heart of Multiauto is the stepped grate in the burner. It provides evenly distributed combustion and continuous cleaning – the boiler does not need to stop for cleaning, and operation is smoother.
With the grate, the boiler can burn more types of fuel, including wetter and dirtier ones. You get greater freedom of choice, and peace of mind should a fuel become hard to obtain.
| Operation | Combustion | Cleaning | |
|---|---|---|---|
| Stepped grate | OperationThe boiler never has to stop for cleaning. | CombustionSteady, even with wetter fuels and chips with bark. | CleaningAutomatic and continuous, in two phases. |
| Tipping grate | Tipping grateStops to tip out the ash. | Tipping grateOutput drops as bark, hard-to-burn material or impurities build up. | Tipping grateFrequent cleaning, with starts and stops and a risk of sintering. |
All Multiauto boilers have a moving stepped grate instead of a fixed tipping grate. That is why you can burn the fuel that is cheapest right now and readily available.
03Exploded view
Part by part.
The casing, doors, boiler body and feed system, one by one – here on Multiauto 38–60. Point to a part to see what it does.
Safe against burn-back and cuts over-long pieces. Available in two sizes by output and driven by two chains.
Feeds the fuel into the burner. Available in two versions, 100 and 150 mm.
Drives the feed system. The gearbox is maintenance-free.
Firebox and convection section, surrounded by the boiler water.
Sits behind the front panel. All doors have a stainless steel shield and ceramics against radiant heat.
Automatically adjustable, for the right flue gas flow.
The ash is discharged automatically, into a large box of 70 litres.
Touch display with smart functions, easy to use.
04Fully automatic operation
Heat that looksafter itself.
Multiauto lights itself, cleans itself and discharges the ash. You can spend your time on other things.
- Ignition
- Industrial-grade hot-air igniter
- Cleaning
- Automatic, in the grate and flue tubes
- Ash
- Fed automatically to the ash box
- Design
- Few moving parts, with a minimum of sensors
05How Multiauto works
How the heatis harnessed.
Cleaning, ignition and ash discharge are all automatic. The boiler consists of two modules: a burner module and a heat exchanger module.
- 1Ash screw and ash boxThe ash screw carries the ash here from both the burner and the convection section – the shear pin sits on the outside. 26–38 or 70 litres, removable and easy to empty.
- 2Water jacketThe boiler water surrounds the firebox and tubes.
- 3FireboxRefractory material with silicon carbide, withstands approx. 1,500 °C. The fuel burns out on the stepped grate.
- 4Flue tubesThe turbulators move up and down to keep the tubes clean.
- 5Rotary valve and stokerThis is where the fuel comes in. The stoker screw feeds it into the burner.
1
2
3
4
5
Inlet
Rotary valve
Stoker screw
Motor and gearbox
06Rotary valve and stoker
The fire staysin the boiler.
The rotary valve is fully sealed and safe against burn-back. The stoker screw feeds the fuel into the burner.
- Chip size
- G50+
- Cutting
- 16cmCuts light material longer than 16 cm.
- Rotary valve
- 2sizesDepending on the boiler.
The fuel's path
Fuel store
The fuel is fed by screw from the store, for example a store with a spring agitator.
Rotary valve
The rotor sits in the housing below the inlet. The valve is fully sealed and cuts over-long pieces.
Stoker screw
Generously sized, with thick flights for a long service life. 100 or 150 mm, in a casing of 140 and 190 mm respectively.
Burner
The fuel reaches the stepped grate and burns out.
Motor and gearbox. The motor is completely maintenance-free and directly coupled to the stoker screw. Via twin heavy-duty chains it also drives the rotary valve – the two always work in sync.
07The rest of the boiler
More features.
From ignition to the full lifespan.
EfficiencyUp to 94 %.
Life-cycle cost
Look at the LCC – the cost over the boiler's entire lifetime – not just the purchase price.
Firebox
Refractory material with silicon carbide. Withstands approx. 1,500 °C.
Labelled cables
Every electrical cable, and every wire within it, has its own marking.
Hot-air igniter
All ignition uses an industrial-grade hot-air igniter.
Lambda sensor
Measures the flue gases and adjusts combustion.
08Control and connectivity
From the boiler roomto your phone.
The touchscreen is fitted as standard. With the app or the web interface, you can monitor and control the boiler remotely and receive fault messages instantly.
- 1 · Boiler room
Touchscreen
Output, schedule and fuel type.
- 2 · Remote
Web interface
All settings, remotely.
- 3 · On your phone
The app
iOS and Android.
- 4 · With us
Biotherm
Alarms, remote monitoring and remote control.
Cascade
4 boilers in cascade, up to800kW
If more output is needed, up to four boilers can be connected in cascade. The lambda sensor adjusts combustion automatically. An outdoor sensor and a climate panel for weather compensation are available as accessories, for systems without an accumulator tank.
09Peace of mind 24/7
Secure allwinter.
Safety is built in, from the fuel that is fed in to the ash that is discharged. Operation is monitored continuously, and should anything happen, you will know straight away.
- Rotary valve
- Fully sealed, safe against burn-back
- Lambda sensor
- Self-adjusting combustion
- Ash container
- Overfill protection and alarm
- Biotherm
- Alarms and remote monitoring
10Fuel store solutions
A store builtfor the site.
Shaped by the look of the site and the space available, the quality of the fuel, how you want to fill it and how much it needs to hold.
Multiauto's standard solution is a spring agitator with a screw running directly from the store to the boiler. Besides PelleTech's solutions, we build a range of fuel stores in-house.
- 01Spring agitatorUp to180 m³In various sizes and versions. Standard for Multiauto.
- 02Scraper-floor storeUp to500 m³Hydraulic scrapers push the chips forward.
- 03Heating plantWith built-in storeBoiler room and fuel store in the same building.
- 04CarportSized to your needsThe chips stay dry under cover.
- 05SiloVolume11–185 m³Galvanised steel.
- 06Mobile shredderComplement withAll fuel store solutions can be complemented with our mobile shredder, which turns your residues into a potent fuel – a smart logistics solution for the farm, where all material is put to use.
11Wood chips and pellets
Same boiler,two ways to feed.
The same boiler is fed from a separate store or from an integrated one – in seven versions, from 9 to 200 kW.
Pellet version
With an integrated store, filled from above.
- Width A11
- 1,075–1,320 mm
- Store capacity
- 87–152 kg
Models and dimensions
Seven versions.
9–22, 18–35, 38–60, 65–100, 135, 150 and 200 kW.
A1
A2
A3
A4
B1
| Output in kW | 9–22 | 18–35 | 38–60 | 65–100 | 135 | 150 | 200 |
|---|---|---|---|---|---|---|---|
| A1Total width mm | 1,208 | 1,297 | 1,387 | 1,387 | 1,481 | Data on request | |
| A2Boiler width mm | 580 | 670 | 760 | 760 | 760 | ||
| A3Feeder width mm | 590 | 590 | 590 | 590 | 680 | ||
| A4Depth mm | 1,036 | 1,066 | 1,212 | 1,384 | 1,740 | ||
| B1Height mm | 1,381 | 1,420 | 1,420 | 1,440 | 1,576 | ||
| A10Flue pipe, Ø mm | 150 | 150 | 180 | 180 | 250 | ||
| Boiler weight kg | 550 | 670 | 720 | 830 | 1,180 | 1,850 | 1,850 |
Dimensions apply to the wood-chip version with rotary valve, ± 10 mm on height dimensions.
Need more than 200 kW? All wood chip boilers, up to 4.6 MW
Wood chips and pellets, by version
Technical data.
From 9–22 to 135 kW. Other data for 150 and 200 kW is available on request.
| Output in kW | 9–22 | 18–35 | 38–60 | 65–100 | 135 | 150 | 200 |
|---|---|---|---|---|---|---|---|
| Boiler water volume litres | 70 | 100 | 145 | 186 | 270 | Data on request | |
| Operating pressure min/max bar | 1.5/3 | 1.5/3 | 1.5/3 | 1.5/3 | 1.5/3 | ||
| Max. operating temperature °C | 95 | 95 | 95 | 95 | 95 | ||
| Flow and return | 1″ DN 25 | 1¼″ DN 32 | 1¼″ DN 32 | 1½″ DN 40 | 2″ DN 50 | ||
| Filling and draining | 1″ DN 25 | 1″ DN 25 | 1″ DN 25 | 1″ DN 25 | 1″ DN 25 | ||
| Min. flow at Δt 15 K kg/h | 1,400 | 2,000 | 3,200 | 5,600 | 7,500 | ||
| Resistance at Δt 20 K mbar | 6.5 | 18.1 | 47.2 | 29.4 | – | ||
| Accumulator tank, min. litres | 500 | 700 | 1,200 | 2,000 | 2,000 | ||
| Heat exchanger area m² | 1.12–1.53 | 1.48–2.04 | 3.11–3.78 | 4.15–4.88 | 5.74–6.82 | ||
| Flue tubes pcs | 8 | 10 | 21 | 28 | 35 | ||
| Grate combustion area m² | 0.068 | 0.086 | 0.124 | 0.166 | 0.166 | ||
| Ash box, small / large litres | 26.2 / 70 | 32 / 70 | 38 / 70 | 38 / 70 | 38 / 70 | ||
| Pellet store, capacity kg | 87 | 97 | 101 | 128 | 152 | ||
| Boiler weight kg | 550 | 670 | 720 | 830 | 1,180 | ||
Data according to PelleTech's technical specification, subject to change. Final data for your plant is provided at the design stage.
12Boiler room and installation
Planned fromthe first drawing.
Biotherm designs the boiler room in 3D (IRONCAD) and handles installation, commissioning and fine-tuning.
- Clearance above, B8
- 590–650mm
- At the store, pellets
- 400mm
- Flue pipe
- Ø 150–250mm
- Accumulator tank, min.
- 500–2,000litres
- Boiler weight
- 550–1,850kg
650mmBehind
300mmAt the side
800mmFeeder side
460–640mmIn front
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. PelleTech has been around for over 40 years, and Multiauto came onto the market in 2004. 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 Multiauto in one brochure.
PDF · 24 pages · 5.2 MB
Free heat-load calculation
Let's calculate your heating.
We start with a needs analysis and a free heat-load calculation. Then we take responsibility for the entire plant, from fuel store to finished heating.
info@biothermheat.comVästerås · Luleå