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  1. ALL radiators should ideally have TRVs and then...

    ALL radiators should ideally have TRVs and then the Evohome radiator controllers. The full benefit of Evohome is when every heat output can be controlled by the controller.
  2. The programmer will go and be replaced by the...

    The programmer will go and be replaced by the BDR91. As for the DHW sensor, if you have a sealed unvented cylinder you will need to use the insertion sensor.
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    I too was going to say that but I am not...

    I too was going to say that but I am not qualified. in my case my plumber made the assessment that even a system boiler would not be ideal, so suggested a Heat Only sealed system with a Sealed DHW...
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    @G4RHL, I think you might be confusing the heat...

    @G4RHL, I think you might be confusing the heat output needed from a Combi versus a Heat only stored HW.
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    All I can say is, 38Kw was correctly sized if I...

    All I can say is, 38Kw was correctly sized if I had a traditional radiator only system. But like I said, the conversions from radiators to UFH and the zoning possible with Evohome has meant that a...
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    Yes it was definitely oversized when it went in...

    Yes it was definitely oversized when it went in and contrary to old school thinking even though the house has been extended a lot since the boiler was installed, the heating requirements have...
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    Sorry a Vaillant 438 is a 38Kw boiler, so pretty...

    Sorry a Vaillant 438 is a 38Kw boiler, so pretty close to your 36Kw one.
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    I have a heat only 438Kw and when it was running...

    I have a heat only 438Kw and when it was running at full pelt it not only needed a new 28 from the gas meter to the boiler, it even needed the gas board to bring in a new main from the street to the...
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    The old imperial sizes are still available but...

    The old imperial sizes are still available but not from the leading brands. And it shows in the quality. I replaced an old imperial with a new one and then finally had to bite the bullet and change...
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    try and see if you can achieve the 20C drop...

    try and see if you can achieve the 20C drop between flow and return on each radiator. that give you the maximum efficiency.
  11. from another thread. Try setting the Tmax on...

    from another thread.

    Try setting the Tmax on the boiler BEFORE attaching the Opentherm bridge. I have seen this work in most cases.
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    Sorry, it's been one of those days.

    Sorry, it's been one of those days.
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    This could be huge.

    This could be huge.
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    Maybe there is some sort of a hierarchy like in...

    Maybe there is some sort of a hierarchy like in the ebus.
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    I think that probably only applies to Viessmann.

    I think that probably only applies to Viessmann.
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    Choose a boiler that has been currently confirmed...

    Choose a boiler that has been currently confirmed to work correctly with the OTB, rather than hedging your bet on better future support. Only a small minority aren't and even for them, adding an OTGW...
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    Unless the OTB is intelligent enough to simply...

    Unless the OTB is intelligent enough to simply respond and relay a new OT command to the boiler, I cannot see how a new Controller firmware will fix this for the handful of boilers that need this...
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    This has happened to me once on a HR80 where it...

    This has happened to me once on a HR80 where it wouldn't take on setpoints. Had to reset the HR80, clear the binding and pair it back on.
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    Isn't the world flat any way?

    Isn't the world flat any way?
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    Poll: Honeywell learns the heat characteristics of your...

    Honeywell learns the heat characteristics of your room, which is more useful that Nest learning when you are home! You can get Nest like functionality on Honeywell too using services like IFTTT
  21. We've got plenty of those. Currently the evofw3...

    We've got plenty of those. Currently the evofw3 is to be considered to be in debug mode. So don't be too alarmed by the error messages. It picks up a lot more than any of it's predecessors, so train...
  22. Just a word of caution. evofw3 is in beta, with a...

    Just a word of caution. evofw3 is in beta, with a lot of us engaged in testing it. TX isnt available yet, so depending on your use case, you might not be able to use it. e.g. evofw3 isn't suitable...
  23. Nobody who has never heard of Evohome is going to...

    Nobody who has never heard of Evohome is going to search for Evohome. They will probably search for smart heating system, smart thermostat, app controlled thermostat, app controlled heating system...
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    "Alexa & Google compatibility (not Apple HomeKit)"

    "Alexa & Google compatibility (not Apple HomeKit)"
  25. Has anyone seen evidence of Honeywell actually...

    Has anyone seen evidence of Honeywell actually using variable voltage to the Actuators as a means to partially open or close the port? Because if not, then that's a shame because that would be the...
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