The Vaillant vSMART Internet Room Thermostat — System/Open Vent Pack (0020223158) is Vaillant's smart, internet-connected heating control, built specifically to pair with a system or open vent (regular) boiler on a single wired heating zone. It combines the everyday function of a programmable room thermostat with full remote control from a smartphone or tablet, using Vaillant's own app.
At the core of the vSMART is Vaillant's proprietary eBUS communication protocol, which passes live load and weather compensation data between the thermostat and boiler so the boiler can modulate its output for optimal efficiency rather than simply switching on and off. The thermostat also learns the thermal behaviour of the building over time, refining how it responds to deliver the home's heating and hot water needs.
This pack includes both the vSMART thermostat and the vSMART gateway required to connect a system or open vent boiler to the home's internet connection, along with a wall bracket and table stand so it can be sited wherever suits the household best.
Class VI
ErP Efficiency Rating
+4%
ErP Efficiency Contribution
≈2 Yrs
Battery Life
868 MHz
RF Transmission Frequency
100m
Outdoor Comms Range
7–30°C
Adjustable Temperature Range
Please Note
This pack (0020223158) is the System/Open Vent version of the vSMART, wired to control a system or open vent (regular/heat-only) boiler with a single heating zone. A separate Combi Pack (0020223154) is available for combi boiler installations — check the boiler type before ordering, as the two packs are not interchangeable.
eBUS Boiler Modulation
Uses Vaillant's proprietary eBUS protocol to communicate directly with the boiler, allowing it to modulate output for optimal efficiency and peak performance.
Internet Weather Compensation
Automatically optimises system flow temperatures based on the outside temperature, reducing energy use without sacrificing comfort.
Intelligent Self-Learning
Begins learning the thermal behaviour of the building from installation, tailoring responses to the household's real heating and hot water patterns.
Remote App Control
Full control of heating and hot water from an Android or Apple iOS app, with support for multiple users on one thermostat and one app managing multiple homes.
Electronic Paper Display
A black-and-white electronic paper display gives outstanding contrast in any light and only draws power when the screen refreshes, keeping battery use to a minimum.
serviceASSIST Compatible
Works with Vaillant's serviceASSIST app, letting a heating engineer remotely monitor performance data and fault history for supported installations.
The vSMART gateway connects to the boiler's eBUS terminals and 230V mains supply. Installation and wiring must be carried out by a qualified, competent heating engineer in accordance with Vaillant's installation instructions and current UK wiring regulations.
Frequently Asked Questions
Is this pack for a combi boiler or a system/open vent boiler?
This specific pack (0020223158) is built for system or open vent (regular) boilers on a single wired heating zone. For combi boiler installations, Vaillant's separate Combi Pack (0020223154) is the correct product.
What's included in the box?
The pack includes the vSMART thermostat, the vSMART gateway needed to connect the system to the home's internet router, a wall bracket, and a table stand, so the thermostat can be sited on a surface or fixed to a wall.
Does the vSMART work with all Vaillant boilers?
The vSMART is designed to work with Vaillant's modulating boiler range via the eBUS protocol. This pack specifically wires to a system or open vent boiler with one heating zone — always confirm compatibility with the exact boiler model before installation.
How long do the batteries last?
The vSMART thermostat runs on 3 x AAA batteries with a typical battery life of approximately 2 years, helped by the low-power electronic paper display, which only draws power when the screen refreshes.
Can more than one person control the heating from the app?
Yes. The Vaillant app supports multiple users on a single thermostat, and a single app login can also be used to manage more than one vSMART-controlled property.
Is professional installation required?
Yes. The vSMART gateway wires into the boiler's eBUS connection and mains supply, so installation should be carried out by a qualified heating engineer in line with Vaillant's installation instructions.
BTU & WATT Calculator
Room Dimensions
Room Type
Living Room
Bedroom
Kitchen
Bathroom
Conservatory
Hallway
Glazing Type
Single Glazed
Double Glazed
Triple Glazed
External Walls
0 Wall
1 Wall
2 Walls
3 Walls
4 Walls
Insulation Level
Poor
Average
Good (New Build)
Required Heating
0
Watts
0
BTUs
Documentation
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