Vaillant VRT 50 - room thermostat
Code: 0010041871Product detailed description
Vaillant VRT 50 - a simple and reliable room thermostat for boilers with an eBUS bus
The Vaillant VRT 50 is a wired room thermostat designed for wall mounting in a reference room of an apartment or house. Its task is to continuously measure the current air temperature at the location where it is installed and, based on this value, directly regulate the boiler's output so that the required temperature is maintained with minimal fluctuations and without unnecessarily overloading the heating system. It is a typical representative of the basic yet technically advanced control technology from Vaillant, which is installed mainly where the investor does not need complex weekly programming or control via a mobile app, but wants precise, reliable, and time-tested temperature control in the reference room.
The VRT 50 thermostat is connected to the boiler with a simple two-wire cable to communication terminals 7-8-9 of the control electronics (depending on the specific boiler type), which significantly simplifies the wiring compared to older analog solutions. The device belongs to a family of appliances designed for the new generation of Vaillant boilers with an eBUS electronic board, i.e. mainly the ecoTEC, ecoTEC plus, ecoTEC exclusiv series and other models supporting the eBUS bus manufactured in the last decade.
Main technical features
- Type of control: optionally two-point (ON/OFF) control or continuous modulating control of boiler output according to the instantaneous deviation of room temperature.
- Backlit LC display showing the current room temperature - readable even in low room lighting, for example in a hallway or living room at dusk.
- Intuitive "turn & click" control principle - setting the desired temperature with a single rotary dial without a complicated menu.
- Temperature setting range for the day (comfort) mode: 5 to 30 °C.
- Temperature setting range for the night (ECO/setback) mode: 5 to 30 °C, independent of the day setting.
- Communication with the boiler via the eBUS bus, enabling precise transmission of the measured temperature and status information without signal loss, unlike simple bimetallic thermostats.
- Compact housing designed for surface wall mounting, easy cover removal for wire connection and maintenance.
- Low energy consumption, powered directly from the boiler's control electronics via the communication cable - no batteries or separate power supply needed.
Compatibility and wiring
The VRT 50 is designed for Vaillant boilers equipped with an electronic board supporting the eBUS bus. This group includes the vast majority of wall-mounted and floor-standing Vaillant gas boilers manufactured since the mid-2010s, including the ecoTEC pro, ecoTEC plus and ecoTEC exclusiv series. Before purchasing the VRT 50 thermostat, it is therefore advisable to check the technical documentation of the specific boiler to see whether it has communication terminals 7-8-9 for connecting an eBUS room controller, or to consult an authorized service technician or directly our sales team.
The thermostat is connected with a two-wire cable (recommended type e.g. shielded cable JYTY 2x0.8 mm or similar, depending on the length of the route and interference in the installation) running from the boiler to the reference room. The reference room should be chosen so that it best represents the average temperature in the apartment - typically the living room or hallway, away from direct sunlight, away from drafts from doors and windows, and away from heat sources such as televisions, fireplaces or kitchen appliances.
Installation and setup
Installing the VRT 50 thermostat consists of several steps: choosing a suitable location in the reference room at a height of approximately 1.2 to 1.5 m above the floor, fixing the rear mounting plate to the wall using the supplied plugs and screws, connecting the two-wire cable to the terminals in the thermostat according to the wiring diagram in the installation manual, fitting the thermostat cover, and finally configuring the boiler to recognize the connected eBUS room controller (usually automatically at first startup, or manually via the boiler's service menu).
After installation, simply set the desired day and night temperature on the thermostat using the rotary control - the boiler then automatically adjusts its output to maintain this temperature in the reference room with minimal deviations. Switching between day and night (ECO) mode is possible either manually directly on the thermostat, or automatically according to a time schedule set in the boiler's system controller, if part of the installation.
We recommend entrusting the installation to a qualified service technician, who will also check the correctness of the wiring, set the boiler parameters for cooperation with the room controller, and verify the functionality of the entire system, including any connection to an existing weather-compensated controller or system control unit.
Why choose the VRT 50
The VRT 50 is an ideal choice for households looking for a simple, reliable and affordable replacement for older or faulty thermostats, but who do not want to invest in more complex systems with weekly programming or internet control. Thanks to direct communication with the boiler's control electronics, it provides more precise control than simple bimetallic or electronic thermostats with a simple relay output, because the boiler receives information about the current temperature deviation and can smoothly modulate its output instead of crude switching on and off.
This brings real savings on fuel costs, as the boiler does not work unnecessarily at maximum output and then switch off for a long time (so-called cycling), but maintains a stable output corresponding to the current heat loss of the building. At the same time, operating the thermostat is extremely intuitive even for less technically skilled users, making it a popular choice when replacing old boilers with new condensing Vaillant units, where the investor wants to keep the operation simple.
Maintenance and care
The VRT 50 thermostat requires almost no maintenance during operation. It is recommended to occasionally wipe the display and housing with a slightly damp cloth without using aggressive chemical cleaning agents or solvents, which could damage the plastic cover or display. Since the device is not battery-powered, there is no need for regular battery replacement. If incorrect temperature measurement is suspected (for example, if the thermostat is exposed to direct sunlight or drafts), we recommend reconsidering its placement in the room - accurate measurement of the reference temperature is key to the correct function of the entire heating system.
In the event of a communication fault with the boiler (e.g. an error message on the boiler display about loss of connection with the room controller), first check the mechanical connection of the wires at the terminals, or contact a service technician who will perform diagnostics using the boiler's service software.
Frequently Asked Questions (FAQ)
Is the Vaillant VRT 50 compatible with my older boiler?
The VRT 50 is designed for boilers with an eBUS electronic board. With older boilers without this bus (for example older models with simple analog control), the thermostat may not work or will require an additional module. We recommend checking compatibility according to the boiler's type designation or consulting our technical team.
Can a weekly heating program be set on the VRT 50?
The VRT 50 itself primarily serves as a sensor and temperature controller in the reference room with the ability to switch between day and night mode. The time (weekly) heating program is set in the boiler's higher-level system controller (for example calorMATIC or multiMATIC), which then automatically switches between day and night temperature according to the clock.
What cable is needed to connect the thermostat?
A standard two-wire cable of suitable cross-section (typically 0.5 to 0.8 mm2) is sufficient, ideally shielded if it runs parallel to power wiring, to prevent interference with the communication signal.
Do I need batteries for the VRT 50 thermostat?
No. The VRT 50 is powered directly from the boiler's control electronics via the communication cable, so no batteries or separate power source are needed.
Where is the best place to install the thermostat?
In the reference room that best represents the average living temperature - most often the living room or hallway, away from direct sunlight, drafts and heat sources, at a height of approximately 1.2 - 1.5 m above the floor.
What is the difference between the VRT 50 and the wireless sensoHOME 380f thermostat?
The VRT 50 is a wired thermostat without its own time program and without radio communication, while the sensoHOME 380f communicates with the boiler wirelessly, has its own weekly time program and the option to connect an outdoor sensor. The VRT 50 is a simpler and cheaper choice where a cable can be run and weekly programming directly on the thermostat is not needed.
Can the installation be done by a DIYer?
A skilled DIYer can handle the mechanical wall mounting and wire connection, but setting the boiler parameters for cooperation with the room controller and the final functionality check should always be entrusted to a qualified service technician, especially to maintain the boiler warranty.
What is the eBUS bus and why is it important
eBUS is a digital communication bus used by Vaillant (and several other European heating technology manufacturers) for two-way data exchange between the boiler, room controller, and other elements of the heating system (e.g. a storage water heater, solar controller or internet gateway). Unlike a simple contact (relay) connection, where the thermostat only opens or closes a circuit, the eBUS bus transmits the exact numerical value of the measured temperature and other operational information. This allows the boiler to evaluate in real time how many degrees the current temperature differs from the required one, and adjust its output smoothly accordingly, instead of switching abruptly to full power and then switching off. The result is a more stable room temperature, less burner cycling, and generally lower fuel consumption compared to simple two-point thermostats without bus communication.
Typical usage scenarios
The VRT 50 is most often installed when replacing an old boiler with a new Vaillant condensing boiler, when the investor wants to maintain simplicity of operation while taking advantage of more modern, more precise control. It is also suitable for renovations of apartments and houses where a route is available for laying a low-voltage cable between the boiler room and the living space, but the investor does not require a smartphone app or complex zoning. Another typical case is replacing a faulty or outdated analog thermostat with a more modern device compatible with the current generation of boiler control electronics, which also simplifies future servicing, as the manufacturer and distributor have spare parts and technical support available for the VRT 50.
On the other hand, for households that prefer a wireless solution without the need to run a cable, or that require weekly programming directly on the thermostat and remote control via a mobile app, we recommend considering wireless models from the sensoHOME series or system controllers multiMATIC and sensoCOMFORT, which you can find in our range in the same Vaillant control technology category.
Comparison with other Vaillant controllers
| Model | Connection type | Time program | Suitable for |
|---|---|---|---|
| VRT 50 | Wired (eBUS) | No (controlled by a higher-level controller) | Simple, precise control of a single reference room |
| sensoHOME 380f | Wireless (radio) | Yes, weekly | A single direct heating circuit without the need for wiring |
| multiMATIC 700f / sensoCOMFORT 720f | Wireless and wired variants | Yes, full-fledged system program | Comprehensive weather-compensated control with multiple circuits and an app |
This table illustrates exactly where the VRT 50 fits within Vaillant's control technology range - it is an entry-level, yet technically complete solution that provides the core of what matters most: precise measurement and smooth communication with the boiler, without paying extra for features that some households will never use.
Additional frequently asked questions
Can the VRT 50 be later upgraded with wireless communication?
No, the VRT 50 is designed as a wired device. If you later want wireless control, it needs to be replaced with a wireless model, for example the sensoHOME 380f or the sensoCOMFORT system with a radio receiver.
Does the length of the connecting cable affect the thermostat's function?
For typical lengths within a house or apartment (up to approx. 50 m), the cable length is not a problem, provided a suitable wire cross-section is used and the cable is not routed parallel to power wiring without shielding. For longer routes or strong electromagnetic interference, we recommend a shielded cable.
Is it possible to connect multiple VRT 50 thermostats to one boiler?
A typical home installation uses one reference thermostat for one direct heating circuit. To control multiple circuits (for example several floors or zones), a system controller with zoning support is required, such as multiMATIC or sensoCOMFORT with the appropriate expansion modules.
Summary
The Vaillant VRT 50 represents a proven and technically reliable solution for precise temperature control in a single reference room without unnecessary complexity. Thanks to direct communication via the eBUS bus, the boiler can smoothly modulate its output exactly according to need, which has a positive effect on both gas consumption and living comfort. It is a choice for anyone who wants simple yet effective heating control without compromising on control precision, while retaining the option of later upgrading to a full-fledged system controller with app support and zoning, since both worlds - the simple VRT 50 and the advanced multiMATIC/sensoCOMFORT - share the same eBUS communication philosophy.
Additional parameters
| Category: | Vaillant Controls |
|---|---|
| Warranty: | 2 years |
| Device type: | Wired room thermostat |
| Communication with boiler: | eBUS (2-wire cable, terminals 7-8-9) |
| Control type: | Two-point (ON/OFF) or modulating |
| Display: | Backlit LC display showing room temperature |
| Setting range - day mode: | 5 - 30 °C |
| Setting range - night (ECO) mode: | 5 - 30 °C |
| Control: | "Turn & click" principle |
| Power supply: | From the boiler's control electronics (no batteries) |
| Mounting: | Surface, on the wall in the reference room |
| Compatibility: | Vaillant boilers with eBUS electronic board (ecoTEC, ecoTEC plus, ecoTEC exclusiv, etc.) |
| Country of origin: | Germany |
| Manufacturer: | Vaillant |
| Warranty: | 2 years |
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O spoločnosti
Skupina Vaillant Group je synonymom vykurovania a prípravy teplej vody, pričom hlavný dôraz kladie na kvalitu, spoľahlivosť a užívateľský komfort. Jej produkty tepelnej techniky sú zastúpené vo viac ako 100 krajinách sveta. Združuje značky Vaillant, Saunier Duval, AWB, Bulex, DemirDöküm, Glow worm, Hermann Saunier Duval a Protherm. Každá z týchto značiek má s výrobou vykurovacích zariadení bohaté skúsenosti, pretože väčšina z nich je v danom segmente viac ako 80 rokov. So svojím 140 rokov dlhým pôsobením na trhu však patrí hlavne značka Vaillant k tým najväčším a najvýznamnejším. Dlhodobo je lídrom na trhu a priekopníkom vo vývoji a inováciách v oblasti vykurovacích technológií v Európe. Skupina Vaillant Group má vybudovanú rozsiahlu sieť obchodných zastúpení a tisíce spokojných zákazníkov po celom svete.
Do bohatého portfólia Vaillant Group patria moderné technológie vykurovania, ktoré sú energeticky úsporné, efektívne a prispievajú k ochrane životného prostredia. Vďaka širokému spektru produktov a modelov si tu každý zákazník nájde presne to, čo potrebuje. Sortiment zahŕňa závesné a stacionárne kotly, zásobníky teplej vody či elektrické spotrebiče. Na trhu závesných kotlov je spoločnosť s 26 percentným podielom dokonca číslom jedna v Európe. Vaillant Group sa nešpecializuje len na vývoj a výrobu kotlov, do jej produktového portfólia patria aj technológie využívajúce obnoviteľné zdroje energie, ako sú solárne systémy či najmodernejšie tepelné čerpadlá a klimatizácie. Užívateľom ponúka tiež rekuperačné alebo kogeneračné jednotky či zeolitové tepelné čerpadlá.
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Udržateľnosť
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