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Checked Worcester Bosch website and it looks like the DT20Rf. It has a radio transmitter symbol in the middle? Is there an alternative rf room thermostat i could use?

i have a dt20rf timer installed in boiler but do not have rf room thermostat for it. Is there an alternative room thermostat which can communicate with the timer? withiout one i cant get timer to work or advance. It only acts as on or off.