What is the TIS Tronic 260U?

It is the electronic regulator fitted to UNI solid fuel boilers. It controls the combustion fan with variable speed, runs the central heating and domestic hot water pumps, and offers three combustion algorithms — Standard, Brager Expert, and Brager Expert exhaust gases.

What is the difference between the TIS Tronic 260U and the older TIS Tronic 83?

The 260U is the current model, with a large colour LCD, three operating modes including the Brager Expert adaptive algorithms, and support for an exhaust gas sensor. It can be retrofitted to boilers that came with a TIS Tronic 83 using an adapter plate.

Does the controller need an exhaust gas sensor?

Only for Brager Expert exhaust gases mode, which is the mode MBtek recommends for the UNI 60. The PT1000 exhaust sensor is not included in the standard controller kit and must be ordered separately.

TIS Tronic 260U overview

What the TIS Tronic 260U controller does on a UNI 60 — fan modulation, pump control, three operating modes, hot water preparation and the safety chain behind it.

The TIS Tronic 260U is the electronic regulator that turns the UNI 60 from a wood stove into a controlled heat source. It modulates the combustion fan, runs the pumps, prepares domestic hot water, and reacts to a room thermostat — all from a colour LCD with six buttons.

TIS Tronic 260U control panel showing the colour display with boiler temperature, four status indicators on the right, and six buttons below — **TIS Tronic 260U control panel.** Indicators, left to right on the right-hand column: alarm, CH pump, HUW pump, fan. Buttons: START, DOWN, UP, STOP, F. Source: TIS Tronic 260U manual §3.1.

What it controls

Function	Output / input
Combustion fan, variable speed	`Q1`
Central heating pump	`Q3`
Domestic hot water (HUW) pump	`Q4`
Boiler water temperature	`T1`
Hot water tank temperature	`T2`
Exhaust gas temperature (optional)	`T3`
Safety thermostat STB	`I1`
Room thermostat	`I2`
Additional alarm output (optional)	`X23`

Three operating modes

The mode determines what the fan is chasing.

Mode	The algorithm aims to…	Needs exhaust sensor?
Standard	Reach the set boiler temperature, running two stages — Operation and Supervision — on fixed user settings	No
Brager Expert	Reach the set boiler temperature, automatically selecting optimal settings to match output to actual heat demand	No
Brager Expert exhaust gases	Automatically select fan settings to maintain a constant exhaust gas temperature	Yes (PT1000)

MBtek's recommended settings for the UNI 60 assume Brager Expert exhaust gases. Full detail on Operating modes.

Domestic hot water

The controller prepares hot water in Summer or Winter mode, with or without priority. In Summer mode the boiler's only job is the tank; in Winter mode heating and hot water run together. See Hot water.

The safety chain

The controller is not the last line of defence. Three layers act in order:

Maximum boiler temperature (user setting, MBtek recommends 80 °C / 176 °F). External devices such as the room thermostat are ignored until operation becomes stable, and fan control functions are disabled.

Boiler emergency threshold, 94 °C. The controller raises an alarm and switches to boiler protection mode.

STB bimetallic sensor on I1, ~90 °C. Hardware. It cuts the fan. Per PN-EN 303-5:2012 the fan cannot restart until the water is below 60 °C and the alarm has been manually reset.

Specification

Property	Value
Power	230 V / 50 Hz AC
Power consumption (no external devices)	4.5 W
Output loading — fan, CH pump, HUW pump	1 A each
Relative humidity	30–75 %
Ambient temperature	5–40 °C / 41–104 °F
Fuse	250 V, 3.15 A, 5 × 20 mm
Conformity	2014/35/EU LVD, 2014/30/EU EMC · PN-EN 60730-1:2012, PN-EN 60730-2-9:2011 · CE 05/2020
Manufacturer	BelKomin LLC, Grodno, Belarus

Where the regulator may be used

The regulator must not be used for boilers operating in installations that do not comply with PN-EN 303-5. It is designed to control a central heating boiler that has its own independent safety system — for example against overpressure in the system.

NextControl panel

What every button, indicator and screen does.