Image is for illustration only and should not be relied upon Siemens (Landis and Staefa) RWB27Si Timeswitch

Siemens (Landis and Staefa) RWB27Si Timeswitch

Ex VAT: £35.99
HCO Code: 09D01
Availability:  In Stock

The RWB27 offers customers unique menu programming allowing settings to be made in a quick easy and efficient way.

The devices offer the following features
* Complete with new backplate
* 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
* Battery back-up
* 6(2)A SPDT Volt-Free contacts
* Dimensions 90x145x34mm HxWxD

Replaces (same backplate & wiring for easy changeover):
Landis & Gyr / Landis & Staefa RWB30, RWB30E, RWB50, RWB100, RWB152, RWB 152cw, RWB170, RWB7, RWB-XT, RWB27
Landis & Gyr Microgyr 30, 30E, 50, 100, 152, 152cw, 170, 7, XT.
Boss Therm RT7, RT24, BUT, RTF7
British Gas EMT1

Replaces (same backplate but requires a link from terminal 2 to L on the backplate):Landis & Gyr / Landis & Staefa RWB3

Write a review

Note: HTML is not translated!
    Bad           Good
Hi there, we have Siemens REB27Si Timeswitch installed in our flat before we moved in; how can we reset or turn it off the boiler service interval reminder? I got boiler engineer came for the service, but he didn’t know how to do it too. Please advise, many thanks!
Hi. You will need to contact Siemens on 0330 2221996. You will likely need to provide proof that you own the flat rather then renting it from a landlord. If you do rent the flat, then you will need to contact your landlord.
Hi there, I have a BossTherm that just says that on bottom left and BUP bottom right. I have some photos I could send to see if this would fit. Thanks for your help, Jim Graham.
Hi This is not suitable to replace the Boss Therm BUP. You need the RWB29Si.
As I want an easy fix solution [plug & play] - Is the RWB27 a direct replacement for the Landis & Gyr RWB30, i.e. utilizing the original back plate / fixings, plug in method connections, and original house wiring. For additional info - The original boiler is a Myson Economist WM30 / 40 with separate 3 way motorised valve, Immersion Tank c/w stat and a room stat.
Yes the RWB27 would do that. It's a very easy 10-minute job.
Can I replace a REV11 with this thermostat
No. I would recommend the RDE10.1 (HCO code 25A01).
How exactly do you turn the timeswitch from 2 on/offs to 3 on/offs? I cannot see this explained in the instructions.
There is a switch on the back of the unit. You will need to press the reset button on the front after changing it. Make sure you switch off the electric before removing it from it's backplate.
Hi can I replace rwb9 with the rwb27
No, you need the RWB29Si.
Is the RWB27 compatible with the RWB7 backplate?
Yes it is.
I have one of these but I need to know if you can use it in conjunction with a room thermostat and if so, what is compatible? Thanks
I would recommend the RAA21.
Will the RWB27 fit on the back plate of a RWB100 or will I have to rewire
It will fit onto the existing backplate for a simple swap.
I Have a RWB27 but the back light seems to have failed can this be replaced? Regards R Knott
You will have to replace the whole programmer. There are no spares available for the RWB27.
Can I replace a siemens rwb30e with this, if so is it just a case of taking the old out and rewiring this one with no extra back plate fitting?
Yes you can. It will simply plug onto the existing backplate with no need to rewire.
Hi, want to install this but what size wiring do I need to buy? Thanks
If you are installing this to a combi boiler, with a short run, then 0.75mm heat resistant cable would be fine.
what is the best way to just turn heating on for say an hour then turn it off without having to programme anything
This product has a boost button that you can simply press to do that.
Does this model replace the Microgyr 50 controller?
Yes it does. It will fit onto the existing backplate for a simple swap.
Does this replace the RWB9?
No, you will need the RWB29:
What period of guarantee do the Siemens programmers have? Thanks
It is the longer of 1 year from date of purchase or 2 years from date of manufacture.
Does it replace RWB 152cw
Yes it does.
It states there are 2/3 on off times - what does this mean - is it 2 or 3? I am looking for one to replace a RWB100 but with at least 3 on/ off times for each day
There is a switch on the back to choose between 2 or 3 on/offs per day.
i have no instrution for this model, as it is allready in my flat, & i dont know what to press etc, can you le t me have a download please, as a senior citizen am not familler with it, thanks.
There is a downloadable manual on our page please see downloads section.
Hi - is this compatible as a replacement for a faulty RWB7 central heating time switch? If so, how easy is it for a DIY novice to replace? Many thanks
It simply plugs onto the existing backplate with no wiring changes. So its a simple 5-minute job.
As you look at the front of the timeswitch, (as in your online pic), are the backplate terminals on the left-hand or right-hand side? Can you also confirm that it is a direct replacement for the Siemens RWB30 timeswitch?
They are on the left, this is the same across the RWB range. Yes, it will clip onto the existing backplate for an easy swap.

Ask a question

Note: HTML is not translated!