The Drayton Digistat Battery 3A Relay (2290B) is a battery-powered, app-enabled room thermostat giving a simple two-wire connection to the boiler with a 3A relay output — no extra wiring runs, and no mains supply needed at the thermostat itself. It brings the same universal Digistat operation to a battery-powered platform, making it a straightforward retrofit for properties where running extra cable is impractical.
Programme it directly on the unit 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 thermostat operation, with settings optimised for gas, oil or heat pump systems.
2-Wire
Boiler Connection
5–30°C
Setting Range
3(1)A
Relay Output
2×AA
Battery Powered
Bluetooth
App Control, No Wi-Fi
2 Years
Guarantee
Battery-Powered, Two-Wire Connection
Uses just a two-wire connection to the boiler with a 3A relay output, avoiding the need for a mains supply run to the thermostat location.
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.
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.
Settings Retained on Battery Change
Programmed schedules and settings are retained when batteries are replaced, so there's no need to reprogram after routine maintenance.
Optimised for Gas, Oil, Heat Pump & Electric
Installer-selectable fuel-type optimisation adapts cycling behaviour to suit gas, oil, heat pump, or electric heat sources.
Boiler Plus Compliant
The 2290B qualifies as both a Smart Control and Load Compensation measure under Boiler Plus, satisfying the additional control requirement on new or replacement boilers.
Important Safety Information
The 2290B is designed for fixed wiring only, in accordance with current IET wiring regulations (BS 7671). Installation and wiring should be carried out by a competent person, with the mains electrical supply isolated before starting work.
Good to Know
The 2290B includes accessibility features for visually-impaired users: it can be set to manual (temperature-only) mode, has recessed + and – buttons, and provides an audible tone above and below the set point when audible feedback is enabled.
Technical Specification
Identification
Brand
Drayton
Manufacturer Part Number (MPN)
2290B
Range
Digistat
Power & Electrical
Power Supply
2 x AA 1.5V alkaline batteries
Switch Type & Rating
3(1)A at 230V/50Hz
Min. Recommended Current
SPDT (voltage free), 10mA @ 24V AC (inductive)
Wiring
Fixed wiring only, two-wire connection to boiler
Control & Programming
Temperature Setting Range
5°C to 30°C
Programming Options
7-day, 5/2-day, 24-hour, or manual
App Control
Wiser Home app via Bluetooth (no Wi-Fi required)
Service Interval
Optional configurable reminder
Physical & Environmental
Dimensions
90 x 135 x 31mm (H x W x D)
Ambient Operating Temperature
0°C to 40°C
Ambient Operating Humidity
20% to 80% (90% non-condensing)
Protection Level
IP30
Colour
White
Standards & Warranty
Energy Class
IV = 2%
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
Retrofit installations where running mains power to the thermostat location is impractical. Combi and system boiler control using a simple two-wire, 3A relay connection. Boiler Plus-compliant upgrades combining smart control and load compensation without additional wiring.
Frequently Asked Questions
Does the 2290B need a mains electrical supply?
No. The 2290B is battery powered, using 2 x AA alkaline batteries, and connects to the boiler using only a simple two-wire, volt-free relay connection.
Will I lose my programme when I change the batteries?
No. Settings are retained on battery change, so schedules don't need to be re-entered after routine battery replacement.
Do I need Wi-Fi to use the app with the 2290B?
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.
What fuel types is the 2290B optimised for?
The 2290B supports optimised settings for gas, oil, heat pump and electric heating systems, selected during installation to match cycling behaviour to the heat source.
Is the 2290B suitable for visually-impaired users?
Yes. It can be set to manual (temperature-only) mode, has recessed + and – buttons, and can provide an audible tone above and below the set point.
Is the 2290B Boiler Plus compliant?
Yes. The 2290B qualifies as both a Smart Control and a Load Compensation device under Boiler Plus, satisfying the additional control requirement on new or replacement boiler installations.
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
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