Drayton RF901 Digistat Single-Channel RF Thermostat with OpenTherm

Description

The Drayton RF901 Digistat Single-Channel RF Programmable Room Thermostat with OpenTherm is an award-winning wireless heating control offering a genuine choice of outputs: a conventional 3A volt-free relay, or a full OpenTherm connection for compatible boilers. That flexibility means one product can serve both standard on/off installations and modern modulating boiler setups.

Programme it directly on the thermostat or via the Wiser Home app over Bluetooth — with no Wi-Fi or broadband router required — choosing between 7-day, 5/2-day, 24-hour, or simple manual operation. When wired via OpenTherm, the RF901 delivers load-compensating control that helps the boiler modulate more efficiently, supporting Boiler Plus compliance on qualifying installations.

Relay or OpenTherm

Selectable Output

5–30°C

Setting Range

50m

Typical RF Range

3(1)A

Relay Output Rating

Bluetooth

App Control, No Wi-Fi

2 Years

Guarantee

Selectable Relay or OpenTherm Output

Choose between a 3A volt-free relay for conventional wiring or a full OpenTherm connection for compatible boilers, all from one receiver.

Bluetooth App Control, No Wi-Fi Needed

Programme via the Wiser Home app over Bluetooth, with no home Wi-Fi or broadband router required, alongside full manual control on the thermostat itself.

Universal Programming

Switch between 7-day, 5/2-day, or 24-hour programming, or use it as a simple manual room thermostat depending on the household's needs.

Load-Compensating OpenTherm Control

When connected via OpenTherm, the RF901 helps the boiler modulate more efficiently rather than simply switching fully on or off.

Automatic Thermostat-Receiver Pairing

The thermostat and receiver pair automatically on power-up, simplifying commissioning without manual RF configuration steps.

Optimised for Gas, Oil & Heat Pump

Installer-selectable fuel-type optimisation adapts cycling behaviour to suit gas boilers, oil boilers, or heat pump systems.

Please Note

An OpenTherm-enabled boiler is required to take advantage of the OpenTherm output and its load-compensating control. Where the boiler is not OpenTherm compatible, the RF901 can still be wired using its conventional 3A volt-free relay output.

Important Safety Information

The receiver is designed for fixed wiring only, in accordance with current IET wiring regulations. Electrical installation and wiring must be carried out by a competent person, with the mains supply isolated before starting work.

Technical Specification

Identification

Brand

Drayton

Manufacturer Part Number (MPN)

RF901

Full Pack Reference

RF901 Digistat Single-Channel RF with OpenTherm (includes RF90S receiver & RF90T thermostat)

Thermostat (Digistat RF90T)

Power Supply

2 x AA 1.5V alkaline batteries

Temperature Setting Range

5°C to 30°C

Ambient Operating Temperature

0°C to 40°C

Bluetooth Frequency

2402–2480 MHz

Max Bluetooth RF Power

+10dBm

Dimensions

90 x 135 x 31mm (H x W x D)

Receiver (Digistat RF90S)

Power Supply

230V AC ±10%, 50Hz

Switch Type & Rating

3(1)A at 24V–230V/50Hz

Min. Recommended Current

SPDT (voltage free), 10mA @ 24V AC (inductive)

Ambient Operating Temperature

0°C to 45°C

Automatic Action Rating

100,000 cycles

Dimensions

94 x 122 x 31mm (H x W x D)

Energy Class

V = 3% (load-compensating, OpenTherm mode)

Mounting

Industry-standard wallplate

Radio & Environmental

Radio Frequency

433.92 MHz

Radio Signal Range

50m typical (affected by walls/construction)

Protection Level

IP30

Pollution Degree

2

Standards & Compatibility

Relevant EC Directives

2014/53/EU Radio Equipment Directive; 2012/19/EU WEEE; 2011/65/EU RoHS

Applied Standards

EN60730-1; EN 60730-2-7; EN 60730-2-9; ETSI EN 300 328; ETSI EN 301 489

App Requirements

Android 9+ / iOS 12+ / Bluetooth 4.2 or higher

Manufacturer Guarantee

2 years

Typical Applications

OpenTherm-compatible combi or system boilers where load-compensating control is wanted for improved modulation and efficiency.
Standard on/off boiler installations using the 3A volt-free relay output where OpenTherm is not available.
Retrofit wireless upgrades replacing an older on/off room thermostat with app-enabled scheduling.

Frequently Asked Questions

Do I need an OpenTherm boiler to use the RF901?

No. The RF901 works with most boilers via its conventional 3A volt-free relay output. If the boiler is OpenTherm enabled, the RF901 can instead be wired for OpenTherm to gain load-compensating control.

How do I check if my boiler is OpenTherm enabled?

Look for an OpenTherm logo on the boiler casing or in its instruction manual. If unsure, the boiler manufacturer or installer can confirm OpenTherm compatibility.

Do I need Wi-Fi to use the app with the RF901?

No. The Wiser Home app connects directly via Bluetooth, so no home Wi-Fi or broadband router is needed — only a mobile data connection to open the app itself.

How does the thermostat pair with the receiver?

The thermostat and receiver pair automatically as soon as both are powered up, within a 2-minute window. If this is missed, both units can be reset via their installer menus to re-enter pairing mode.

What fuel types is the RF901 optimised for?

The RF901 supports optimised settings for gas, oil and heat pump systems, selected during installation to match cycling behaviour to the heat source.

Is the RF901 Boiler Plus compliant?

When wired via OpenTherm, the RF901 functions as a load-compensating smart control, helping installations meet Boiler Plus requirements on qualifying boiler replacements.

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