Viessmann Vitotrol 100-E Modulating Room Control | 7968153

Description

The Viessmann Vitotrol 100-E is a wall-mounted, wireless room load compensator that manages heating and hot water via two-way radio communication with the boiler — not a conventional on/off room thermostat, but a device that actively modulates the boiler's output to match real room demand.

Communicating over Viessmann's One Base protocol, the Vitotrol 100-E lets the boiler ramp its heat output up or down smoothly rather than simply switching on and off, improving both comfort and running efficiency without the need for an outdoor temperature sensor.

Modulating

Control type

2.4 GHz

Encrypted radio band

3

Room temp setpoints

1

Heating circuit

ErP 5

Efficiency level

Boiler Plus

Compliant

🛈

Please Note: The Vitotrol 100-E is designed for system boiler (4-pipe configuration) installations and is not intended for use on S-plan or Y-plan systems. It must not be combined with weather compensation on the same heating circuit — choose one control strategy or the other.

Two-way boiler communication

Encrypted 2.4 GHz low-power radio link between the Vitotrol 100-E and the boiler allows genuine two-way data exchange, not just a one-way demand signal.

Output modulation, no outdoor sensor

Boiler output modulation is achieved through the One Base protocol alone — no separate outdoor temperature sensor is required.

Meets Boiler Plus requirements

Satisfies UK Boiler Plus load compensation requirements for new gas boiler installations without additional third-party controls.

DHW temperature regulation

Beyond space heating, the unit also provides domestic hot water temperature control for systems with a compatible cylinder.

Illuminated display with fault indication

Shows room temperature, time and operating state, and will display a boiler fault code directly on the thermostat screen.

Factory-fitted receiver, no extra wiring

No additional receiver unit is needed — the receiver is factory fitted inside the boiler, keeping installation simple.

Specification

Control Function

Type

Wireless room load compensator (modulating)

Communication protocol

One Base (encrypted 2.4 GHz low-power radio)

Heating circuits supported

1

DHW control

Yes — 1 hot water temperature setpoint

Room temperature setpoints

Up to 3 (Reduced, Normal, Comfort)

Time programs

Daily and weekly programs for heating and DHW

Compatibility

System type

System boiler, 4-pipe configuration

Not suitable for

S-plan or Y-plan systems

Weather compensation

Not to be used in conjunction with weather compensation

App integration

Fully compatible with the Viessmann ViCare app

Compliance & Features

Boiler Plus

Meets UK Boiler Plus load compensation requirement

Software updates

Supports automatic over-the-air updates via the boiler's internet connection

Fault indication

Boiler fault codes shown directly on the Vitotrol display

Installation

Wall-mounted, battery powered, no additional receiver required

Is the Vitotrol 100-E a standard on/off thermostat?

No. It's described by Viessmann specifically as not an on/off room thermostat — it works as a load compensator, modulating the boiler's output via the One Base protocol rather than simply switching the burner on and off.

Can I use the Vitotrol 100-E with an S-plan or Y-plan heating system?

No. Viessmann specifies this control for system boiler, 4-pipe configuration installations only — it is not intended for S-plan or Y-plan setups.

Do I still need an outdoor temperature sensor with this control?

No. Boiler output modulation is handled through the One Base communication protocol between the Vitotrol 100-E and the boiler, so a separate outdoor sensor for weather compensation isn't required — and the two shouldn't be combined on the same circuit.

Does this control meet Boiler Plus requirements?

Yes, the Vitotrol 100-E provides load-compensated control that satisfies the UK Boiler Plus requirement for new boiler installations.

What happens if the boiler develops a fault?

Boiler fault indication is shown directly on the Vitotrol 100-E's illuminated display, so faults can be identified from the room without going to the boiler itself.

BTU Calculator

BTU & WATT Calculator

Room Dimensions

Length (in m):

Width (in m):

Height (in m):

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)

Calculate

Required Heating

0

Watts

0

BTUs