SL 199/250 biomass boiler

This range of biomass boilers can burn ENPlus A1 or A2 pellets or up to G50 wood chips, offering you fantastic versatility

Lindner and Sommerauer: SL 199/250 Biomass Boiler

The SL 199/250 range of biomass boilers are capable of burning ENPlus A1 or A2 pellets or up to G50 wood chips, offering you fantastic fuel versatility.

5 year guarantee with your biomass boiler

You can expect heat outputs of 199-250kW from one unit or up to six combined systems in a cascade up to 1,500kW. 

A cascade of biomass boilers

These models deliver 90%+ combustion efficiency and are designed to be as simple and user-friendly as possible. Plus you’ll have the peace of mind of a 5-year warranty on all electronic and moving parts.

Efficient Combustion

Lindner and Sommerauer’s patented rotary grate and burner system are capable of delivering combustion at temperatures over 1,200°C.

Rotary grate and burner system

Plus the innovative lambda sensor allows oxygen to enter the system in just the right amounts which, with the induced draft fan, creates optimum control for combustion efficiency. 

Lambda sensor


The six rows of vertical cylinders in the steel heat exchanger contain sprung turbulators which operate during the cleaning cycle to prevent the buildup of deposits, ensuring maximum heat transfer and no loss of efficiency. 

Easy to Use

Easy to use touch screen

Your SL 199/250 series boiler comes with an electronic control panel fitted as standard. This sleekly designed, modern interface allows you complete control over timers, thermostats and other aspects of the biomass boiler’s controls.  

Biomass boilers with a electronic control panel

Wood Pellet Fuel Delivery and Storage

For total simplicity, wood pellets can be blown into your fuel store via a vacuum tube. Ask us about fuel store solutions, we can provide plenty of ideas and options. 

Wood pellet fuel storage

Wood Chip Fuel Delivery and Storage

Opt for a single agitator of up to 6m in length or multiple agitators on a single unit. Being able to load in wood chips in such a manner allows you to construct large stores, making bulk buying cost-effective and contracting chipping an option.

Wood pellet fuel delivery

 What’s more, these delivery systems can be fitted to the left or right side of the boiler, allowing total flexibility in the layout and design of your plant room. 

Fuel delivery system

This system also comes with a two-piece auger channel (available in lengths up to 15m) and a separate lid for ease of maintenance.


2-piece auger channel


The auger is one solid piece to allow maximum strength and no points of weakness. If you have any questions about fuel delivery systems, please don’t hesitate to get in touch with us.

Safe and Reliable 

When you choose Lindner and Sommerauer, you know you’re choosing safety, durability and reliability. Negative pressure is generated in the combustion chamber through the induced draft fan to provide optimum reliability and safety.

Direct drive gear boxes

The bevelled, direct drive gear boxes are designed with robust silicon carbide-coated ball bearings and the system features no chains that could snap or break.

Inside of a direct drive gear box


The auger motor drive closes if the system shuts down, providing protection against burn back. And the firebox is designed with durable silicon carbide tiles that offer significantly higher resistance to wear than fire bricks. 

An auger motor drive

Finally, the discharge auger control sensor prevents the agitator disc rotating when not required to minimise energy use and power consumption. 

Low Ash Volume

The amount of ash produced to the volume of fuel is around 5%. What little ash there is gets transferred into large ash bins that are easy to remove.

Ash bin for boiler

The ash generated by your biomass boiler is useful as a fertiliser due to high levels of nitrates.

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Technical Data

SL 199/250 Biomass Boiler System SL 199 SL 250
Maximum Heat Output kW 199 250
Minimum Heat Output kW 70 70
Combustion Efficiency %

91.1 Min/ 95.3 Max

Width mm 1,175
Height mm 1,800
Depth mm 2,650
Flow & Return Diameter " 73
Flue Connection Diameter mm 250
Flue Connection Height mm 1,370
Boiler Weight (Assembled) kg 2,100
Auger Weight kg 250
Water Content L 390
Power Supply A/V 16/ 400


Wood Chips

What are wood chips?

Passing small logs or wood waste through a chipping machine produces 3mm pieces (also known as G30). Find out more here.

What is the calorific value of wood chips?

Approximately 3.5 kWh per kg, depending on the moisture content of the chips. We recommend a maximum of 30% moisture and you can check this with a moisture meter.

How much space do I need to store them?

Wood chips need approximately three times as much storage space as wood pellets;

  • Wood Chips = 250KG/m3
  • Wood Pellets = 650KG/m3
Where is the nearest supplier of wood chips?

We always recommend using the fantastic Biomass Suppliers’ List (BSL) for a comprehensive list of high quality suppliers across the UK.

What is the cost wood chips?

If you get bought-in wood chips, you can expect to pay £120 per tonne. Alternatively, if you have your own wood supply, you can arrange for contract chipping for around £50 a time. Contract chippers charge about £150 per hour and they can chip around 15 tonnes in an hour. So you can potentially chip your entire annual supply in half a day and load it straight into your fuel store.

Wood Pellets

What are wood pellets?

Wood pellets are made from compacted sawdust or any other waste produced from sawmills and other manufacturers.

What is the calorific value of wood pellets?

It’s 4.8kWh per kg, meaning you only need one third of the storage space that you would need for chips. Plus you get three times as much heat.

  • Wood Chips = 250KG/m3
  • Wood Pellets = 650KG/m3
How much do I need, compared to oil?

1 litre of oil is equivalent to 2kg of wood pellets.

What is the cost of wood pellets?

You can expect to pay between £180 - £220 per tonne.

Where is the nearest supplier of wood pellets?

We always recommend using the fantastic Biomass Suppliers’ List (BSL) for a comprehensive list of high quality suppliers across the UK.

Can I use any kind of pellets?

The pellets will need to be ENPlus A1 or A2. These are 10-12mm long and 6mm in diameter. Your wood pellets need to be dry, clean, mechanically robust and possess an ash content defined by appropriate standards. They need to be able to flow freely and delivered via a pneumatic system. Check out this handbook from HETAS for more information about wood pellets.