The Cirrus – ESRTP8 is a wired programmable room thermostat, available in white or grey, which is simple to install & easy to use. The control features OpenTherm which automatically reduces the flow temperature of your boiler helping you save up to 15% on your gas use, significantly lowering bills. The Cirrus – ESRTP8 can be upgraded to a smart control with the addition of our ESWIFIHUB (sold separately)