At the heart of the system will be a time control which can easily be programmed to ensure that your heating and hot water are only switched on when you need them, or more to the point, they are not wasting expensive fuel when the house is empty or while you are asleep. The RWB97 is ideal for timed control of central heating systems. The devices offer the following features
* Unique menu driven programming
* Easy to read, larger than average backlit display
* Simple operation
* Up to 3 hour boost facility
* 2/3 on/offs
* Holiday programming
* Universal programming - daily, weekend/weekday, 7 day
* Programmable away from its backplate
* Battery back-up Siemens RWB27 Datasheet 
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BOILERS 
