Can the receiver be installed inside the wall-hung boiler?
No, the receiver cannot be placed inside the wall-hung boiler. The metal shell of the boiler will shield or interfere with the wireless communication of the devices. Instead, the receiver can be magnetically attached to the side of the boiler using the magnetic band on its back cover. (Page 26)
From the official Bosch RT20 Rf Room Thermostat manual, page 26
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