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  1. Replies
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    I can understand why you'd want to mess around...

    I can understand why you'd want to mess around with a pump and burner on such an old boiler, but modern boilers - like cars - are much more clever and advanced. It's best instead to think of them as...
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    Very interesting. A few things I'd mention: 1....

    Very interesting. A few things I'd mention:

    1. Your system seems to be operating at quite a high resolution. Boilers, particularly oil burners don't like to be cycled too much - it's best to limit...
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    You're overcomplicating things. You will only...

    You're overcomplicating things. You will only need a BDR91 to switch on anything, in this case you'll only need one to signal to your boiler and pumps there's a demand.

    A 'zone' in evohome...
  4. Good to see you back top brake! I was...

    Good to see you back top brake!

    I was wondering whether you could direct some of the chaps in Resideo to go through and possibly comment on some of the suggestions in this thread that was started...
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    6,258

    As dty said, there is no difference between...

    As dty said, there is no difference between evohome and Heat Genius on this.

    The Interlock issue shouldn't matter if you've followed advice and have a properly installed parallel CH system, by...
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    Bleeding edge, but here's something:...

    Bleeding edge, but here's something: https://www.geniushub.co.uk/blog/genius-hub-eogb/
  7. Replies
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    Just to add to the list: - HeatGenius can do...

    Just to add to the list:
    - HeatGenius can do UFH, but can't do OpenTherm (though they're testing something with a brand new opentherm-supporting oil burner), and can also do >12 zones.
    - Drayton...
  8. Replies
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    3,272

    It's probably a pressure problem, or lack of....

    It's probably a pressure problem, or lack of. Before you blame the pump, check also to see if the boiler's system pressure is 'in the zone' (usually between 1 and 2 bar, i.e. around 1.4 to 1.6 bar)....
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    Hi Neil - don't want you to feel ignored, but I...

    Hi Neil - don't want you to feel ignored, but I know I can't give you the answers simply because I have no experience with the HCC80R, manifolds and UFH. It also seems to me that the answers to your...
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    3,272

    I think you need to do a good old fashioned...

    I think you need to do a good old fashioned radiator rebalancing.

    My assumption at this stage is that there's another room that's calling for heat, and this cold radiator is being starved because...
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    That sounds strange, even if the radiators were...

    That sounds strange, even if the radiators were piped in series they should both open up...

    I assume you'll have done the obvious of not having a TRV at all on the 2nd rad, and swapped around the...
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    Is this a room with 2 radiators? If so, without...

    Is this a room with 2 radiators? If so, without any configuration the first radiator you bound would be the 'master' temperature sensor - in rooms with more than 1 radiator it's recommended you have...
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    Living Room: 22C evening and weekends (I don't...

    Living Room: 22C evening and weekends (I don't compensate HR92, so I just boost the temp up, it's really 21C on the sofa)

    Bedrooms: 1 hour prior to bed time: 19C, then 17C setback during night....
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    4,551

    Ebus isn't an open standard, but there is a linux...

    Ebus isn't an open standard, but there is a linux daemon called ebusd that can read the data, Vaillant's ebus implementation is constantly changing with their products and isn't widely known.
    ...
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    Personally I have absolutely zero loyalty to...

    Personally I have absolutely zero loyalty to energy suppliers, but it all depends on how proactive you are about reading meters.

    I use an app called Meter Readings, iOS only, see...
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    Radiator specification has gone through a number...

    Radiator specification has gone through a number of changes which is still catching a few people out. The key is to understand about delta-T's (ie dT or ΔT), which radiator water temp relative to...
  17. This is fairly important - without an ABV, I...

    This is fairly important - without an ABV, I strongly suggest making 2-3 of your towel rads to be uncontrolled. This will mean you'll get a warm bum whenever any heat is called anywhere in the house...
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    I think you need to rebind the BDR91, check...

    I think you need to rebind the BDR91, check spacing to boiler and other devices (ie 30cm apart), and for sanity's sake rebind the HR92 on the troublesome radiator.

    And Phillips Hue uses Zigbee,...
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    Yes, you can use any of the following, take your...

    Yes, you can use any of the following, take your pick:
    - DTS92 (best, as eco mode is useful, and also cheapest):...
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    Here's another story - a friend of mine, having...

    Here's another story - a friend of mine, having come back from hospital with his newborn gently put him into his new cot in the next door bedroom to his for his first snooze. He noticed the...
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    If I were you, I'd get those pipes lagged. Also...

    If I were you, I'd get those pipes lagged. Also for efficiency, so that you can further keep your flow temps lower.
  22. Replies
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    I think you have. Because if the boiler does it's...

    I think you have. Because if the boiler does it's frost thing, then the pump-controlled zone valve will open, and you'll get defrosted pipes. If you're on a recommended Fig 4 set up, same thing. If...
  23. Replies
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    32,787

    That's the issue - DBMandrake found a way by...

    That's the issue - DBMandrake found a way by linking the CH valve to the pump timer, so as to allow any heat during the pump overrun to be dumped into the radiator circuit. With the Vaillant...
  24. Here's my wish list for evohome. Basically evolve...

    Here's my wish list for evohome. Basically evolve from 1990's central heating (OpenTherm is 22 years old!) and move into 21st century domestic HVAC and integrate some capabilities between various...
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    Sorry for reviving an old thread, but it's a...

    Sorry for reviving an old thread, but it's a rather important one! I will be installing evohome in a set up very similar to yours: ie S-Plan with OT on a Vaillant 637 and VR33.

    Since I won't have...
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