Solid fuel boiler with automatic loading STALMARK DUO PID 31 kW

This boiler stands out for its versatility, allowing the feeder to be installed on either the right or left side, making it easy to adapt to the user's individual needs. The compact side design ensures convenient access for adjusting operating parameters.

Design features

The DUO-PID boiler is equipped with two firing options:

A modern cast iron retort burner.

A classic combustion chamber with a fixed water grate.

Body
The body is made of a bent welded construction with a water jacket manufactured from certified boiler steel, 6 mm thick.

Operating principle
Combustion is ensured by the automatic feeding of fuel into the cast iron retort burner via a screw feeder. Forced air supply is provided to maintain the process. A built-in cast iron deflector, located above the burner, promotes more complete gas combustion and even heat distribution.

Chimney and damper
The chimney, installed at a 45° angle, ensures efficient gas exhaust. The adjustable damper controls the draft level, preventing excessive vacuum.

Water grate
Allows the use of large-fraction fuel (from 4 cm) and ensures the boiler's operation even during a power outage, provided the heating system is properly designed.

Boiler control
The standard configuration includes an ST-750 TECH controller with a PID algorithm and a flue gas temperature sensor.

Main functions of the controller:

Air supply control.

Monitoring of four pumps (heating, hot water, underfloor heating, circulation).

Control of one valve actuator.

Ability to connect three- and four-way valves, as well as internet/GSM control modules.

Advantages of the STALMARK DUO-PID boiler

Heat exchanger made of certified steel.

Cast iron burner with a thickness of 6–8 mm and screw fuel feeding.

90% efficiency and high combustion efficiency.

Two firing systems: automatic and traditional.

Chimney at a 45° angle for optimal gas exhaust.

Universal door and the option to install the feeder on either side.

Summer mode operation.

PID controller with remote control via internet/GSM.