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  1. Don't have time to reply to all your qs, but one...

    Don't have time to reply to all your qs, but one thing I did notice with the wiser thermostats is that the room stat is usually a good degree lower than the radiator stat.

    Obviously largely...
  2. Wow - a lot of questions. I'll try and answer as...

    Wow - a lot of questions. I'll try and answer as best I can. I've had the Wiser kit fitted for only a few days.



    It depends on your setup. I assume you have 2 motorised valves. If every...
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    Yes sure - do you have domoticz installed on...

    Yes sure - do you have domoticz installed on Windows? I run mine in Docker, so it was slightly more complicated, but on Windows should be relatively easy.

    Once installed, download the Drayton...
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    Forgot to update here - this was, of course, due...

    Forgot to update here - this was, of course, due to TPI. Missed that.
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    So I setup domoticz last night and a dashticz...

    So I setup domoticz last night and a dashticz dashboard - all the zones can be displayed and adjusted from it (!). Opens up a load of possibilities with regards to having a wall mounted display in...
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    Finally taken the plunge with Wiser, with the...

    Finally taken the plunge with Wiser, with the amazon deal yesterday.

    Ordered the 3 zone kit (2 x CH + 1 x HW) and 10 TRV's for downstairs. Another 11 TRV's for upstairs are coming in a week, but...
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    Thanks! That's positive that it's been working...

    Thanks! That's positive that it's been working OK, as I've read they had plenty of problems in the early days, which seem to have been ironed out.

    Do you know if you have a wall thermostat and trv...
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    If you're still around (or for anyone else with...

    If you're still around (or for anyone else with Wiser) - how are you getting on with this? Have you had any issues with it?

    I'm thinking of taking the plunge on a large-ish system too - 2 CH + HW...
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    Ok, I'm not sure I have this plastic cover. If I...

    Ok, I'm not sure I have this plastic cover. If I remove the lower grey cover on the cylinder, this is what I see - you can see the 2 dry pockets and the wires leading into them with the stats.

    1364
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    That's it - "North" and "South", as per your...

    That's it - "North" and "South", as per your description, contain the stats. The 2 wires in each correspond to the overheat stat (which will be spring like and inserted furthest into the pocket) and...
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    That's incorrect. There are 2 dry pockets above...

    That's incorrect. There are 2 dry pockets above and below the connections for the immersion heater.

    I'm basing this on my own cylinder, but this looks identical. A close up picture would help...
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    I can't quite make out your picture, but it looks...

    I can't quite make out your picture, but it looks very similar to mine (Megaflo Eco Indirect 250L). There are 2 dry pockets - one above the immersion heater connections and one below.

    The top one...
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    So your problem is solved? If not, then...

    So your problem is solved?

    If not, then balancing should help in getting a 20 degree delta consistently, regardless of which radiator is on or not. As I said in my first post, though, there's...
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    Start with all closed and open one at a time,...

    Start with all closed and open one at a time, starting with the closest (this will require a quarter turn or even less) and finishing with the furthest (which will probably be fully open - about 8 to...
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    I wrote a reply but not sure where it went. ...

    I wrote a reply but not sure where it went.

    Take TRVs off.
    Use contact probes (rather than IR) at each rad to get delta t of 20 by adjusting lockshield.
    Start with closest rad to boiler first.
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    Over sizing rads is generally good, as at the...

    Over sizing rads is generally good, as at the same delta T you'll get more heat output from them. I've done the same.

    However, your system needs to run at the delta T it was designed for. This...
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    Without balancing, you can't ensure your delta T...

    Without balancing, you can't ensure your delta T at the boiler will be 20 degrees.
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    Just to add, I wonder if the lack of balancing is...

    Just to add, I wonder if the lack of balancing is contributing towards your flow/return problem.

    If your boiler is condensing, it'll have an optimal delta of 20 degrees. This means each radiator...
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    You should balance the system, rather than having...

    You should balance the system, rather than having all lockshields open. Evohome opens TRVs fully if the temp differential is more than a few degrees. As it stands, your rads will be heating up...
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    The radiator may or may not help you as a bypass....

    The radiator may or may not help you as a bypass. It depends on your pump and the minimum flow rate required. The ABV is usually situated close to the boiler and so supplements the flow rate in your...
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    The auto-bypass may need adjusting. Remember,...

    The auto-bypass may need adjusting. Remember, though, that it maintains the minimum flow required by the boiler, so it can't just be set higher, otherwise you may end up with too much differential...
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    Someone more experienced than me will be able to...

    Someone more experienced than me will be able to tell you for sure, but my understanding is the Megaflo temp stat has an overheat stat built into it (effectively wired in series). It has a reset...
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    I find my bubble needs recharging every 6m or so....

    I find my bubble needs recharging every 6m or so. I have a potable expansion vessel which I'll have installed at some point so I can do away with the megaflo's poor solution.
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    Make sure the overheat stat on the megaflo still...

    Make sure the overheat stat on the megaflo still closes the Zone Valve when activated. This is a very important safety feature.
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    The Wiser manual is sparse on info, but it does...

    The Wiser manual is sparse on info, but it does say this:

    The Wiser Heat HubR is an OpenTherm certified product and will therefore operate with OpenTherm certified boilers. Currently The Heat HubR...
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