LUK boilers are for heating terraced houses, apartment blocks, production and municipal buildings mainly with logs. Depending on the boiler’s model, the heated house surface remains between 100-1200 m².

When heated with logs, it is recommended to install an accumulation tank to the heating system. The accumulation tank enables to prolong the heating cycle and maintain more even temperature in the rooms being heated. Additionally, it is possible to install a solid fuel burner, whether on the right/left side or at the front door. In case of a pellet burner, we recommend to install the burner on the burner’s door. By ordering a boiler with a side burner hole, it is possible to use wood chips, grain, grain leftovers, wood shavings, peat briquette for a fuel.

The boiler has three horizontal fire tubes that ensure high efficiency and fast heat transfer. Cleaning the boiler’s firebox and convective parts is easy, comfortable and takes very little time. The boiler has large service hatches. By previously notifying the company Rapla Metall, it is possible to change the handedness. The boiler is made of quality boiler steel according to the standard of manually and automatically heated solid fuel boilers EVS-EN 303-5:2012. The horizontal smoke tubes of the boiler are made of Ø 76 mm pulled steel pipes and the firebox is made of 8 mm steel sheet. The boilers have been tested in the combustion test at Tallinn University of Technology and Estonian University of Life Sciences. The boiler set includes a pressure relief valve, hook, broom. Ash isolation system and smoke turbulators and pneumatic cleaning system for convective parts are available as add-ons.

Operating description of the boiler

All LUK- type boilers transfer the heat generated in the combustion chamber by convection to the boiler water through the steel walls of the boiler’s combustion chamber and flue gas pipes. Hot flue gases travel from the combustion chamber to the upper flue gas pipes passing through the lower flue gas pipes and the cleaning hatch slot and ending up in the flue gas duct, thus generating three flue gas passages.

The optimal burning control is achieved by setting the primary and secondary air and changing the amount of fuel. The quality of burning can be visually assessed or measured by means of a gas analyser.

Used fuels

LUK- type boilers are intended for burning various solid fuels. The nominal power of the boilers is estimated with a solid fuel with humidity level below 30%. The boilers are foremost intended for burning firewood, but they are also suitable for wood clips, briquette an peat.

Advantages

• Operating reliability: boiler’s well-thought structure ensures a lengthy durability
• Quality: the boiler is made of boiler steel and according to a standard EVS EN303-5:2012
• Effectiveness: three fire tubes ensure high efficiency and low smoke temperature
• Comfort: large service hatches and spacious firebox ensures comfortable heating and maintenance
• Tailor-made product according to a customer’s requests
• credibility: we have been producing boilers for over 20 years
• Maintenance: we guarantee that our products will operate for a long period
• Spare parts: immediate availability of all spare parts ensures a complete functionality of the products
• The boilers produced by Rapla Metall have the advantage of being universal regarding fuel that enables to provide the best overall solution of the heating system based on the customer’s needs.