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  1. I would make a couple of dummy AA batteries using...

    I would make a couple of dummy AA batteries using 12mm wood dowel, put drawing pins in each end and wire to your external 3.2v PSU. Alternatively just solder a couple of wires onto the battery...
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    https://www.rvr.ie/products/hr92-vandal-protection

    https://www.rvr.ie/products/hr92-vandal-protection
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    If you use a remote temperature sensor you could...

    If you use a remote temperature sensor you could paint a protection cover internally. The part number is AVS90. see...
  4. Most "Heating Engineers" are at best technicians...

    Most "Heating Engineers" are at best technicians NOT Engineers, despite what BG and others state. If Honeywell made the installation more simple then anyone, technician or public could install...
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    If you use Viessmann with Opentherm make sure...

    If you use Viessmann with Opentherm make sure that Viessmann can supply and support the whole system, I'm using a Viessmann with Opentherm and Honeywell Evohome and they don't play well together. I...
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    Paul I have used Raspberry Pi's and they are...

    Paul
    I have used Raspberry Pi's and they are reliable if you use a RPI3 with USB memory instead of SD card.

    Michael
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    This may help which says A maximum of four...

    This may help which says A maximum of four evohome controllers can be bound to one R8810A OpenTherm Bridge. ...
  8. With a 60Kw system I would go for 2*30Kw and load...

    With a 60Kw system I would go for 2*30Kw and load sharing. Apart from deep winter you will find that the demand is below 30Kw so only need 1 boiler firing. Viessmann have a load sharing system and...
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    I read somewhere, can't remember where, that the...

    I read somewhere, can't remember where, that the opentherm gateway http://otgw.tclcode.com/ helps with control of the Viessmann.

    Michael
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    Instead of using eBus why not use one of your...

    Instead of using eBus why not use one of your Pi's with a couple of DS18B20 Digital Thermometers attached to the flow and return pipes. It should be cheaper and save any Gas Safe problems.

    Michael
  11. Working OK here

    Working OK here
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    I think that the unused rooms should be kept at 1...

    I think that the unused rooms should be kept at 1 deg above dew point so that the structure stays dry.
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    if you look at the HR92-Installation-Guide.pdf at...

    if you look at the HR92-Installation-Guide.pdf at http://www.honeywelluk.com/products/Systems/Zoned/HR92-Radiator-Controller/ on page 7 it shows using a cable ACS90 to connect the external window...
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    What are the pro's and con's of using a USB power...

    What are the pro's and con's of using a USB power supply to power the HR92 instead of batteries?

    One disadvantage of using cheap batteries is leakage wrecking the TRV head, I bought some B&Q...
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    I'm on iOS 11.4.1 and had to remove/re-install...

    I'm on iOS 11.4.1 and had to remove/re-install the app as the app started and terminated in seconds. Fixed with re-install.
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    Wanted Honeywell HGI80

    Has anybody got a Honeywell HGI80 needing a new home?
    Thanks

    Michael
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    Jabes Where did you get your HGI80 from? Thanks...

    Jabes
    Where did you get your HGI80 from?
    Thanks

    Michael
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