The Honeywell T4/T4M/T4R are designed to provide automatic time and temperature control of heating in domestic or light commercial premises.
T4: compatible with 24-230V on/off appliances such as gas boilers, combi-boilers and heat pump
T4R: compatible with 24-230V on/off and OpenTherm(R) appliances such as gas boilers, combi-boilers and heat pump
T4M: compatible with OpenTherm(R) appliances
Also works with zone valve applications but not with electric heating (240V).
Modes of operations: Off mode(frost protection), manual mode, following schedule, timed override, temporary override
Control functions: Multizone Time and temperature
Heating /Cooling application: Heating only
Time setting resolution: 15 minutes
Optimisation: yes
Approvals: EMC:2014/30/EU
LVD: 2014/35/EU
R and TTE: 1999/05/EC
WEEE: 2012/19/EU
Wireless LAN: IEEE 802.11b,g,n
RF communication: ISM 868.0-870.0 MHz Receiver Category 2
Temp. element place: internal
Temperature control accuracy: 0.5C
Setpoint blocking: yes
Setpoint limiting: yes
Control output signal: Switching volt free relay and OpenTherm(R)
Display functions: Fix segment display
Earthing: double insulated
Protection class: IP30
Colour: white
Terminal max. wire size: 1.5mm2
Memory back-up: yes
Ambient temperature: 0...40C
Default time display format: 24 h
Programmed on/off periods per day: 4 or 6
Holiday mode: yes
Temperature setpoints per day: user selectable
Temp. setpoint range: 5...35C
Heat anticipator: yes
Switch function/capacity: 230Vac, 5A

T4R wireless, Table stand, Wall bracket
Product description: T4R Wireless Thermostat Kit for South Europe
Housing (HxWxD): 98mm|136mm|62mm
ErP Class: V
Power source: 2x AA Batteries
Battery life: 2 years