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Thread: evohome - What shedule do you use ?

  1. #11
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    Yes, the new boiler most certainly has made a big difference in terms of usage. My usage in 2016 - with Evohome - was 11175 kWhs on an old Classic Ideal boiler. In 2017, usage fell to 8500kWhs. The new boiler was installed in the first week of April. A part of that saving is the lack of a boiler pilot light. To achieve the usage level that I am getting, I believe that it is important to maximise the efficiency of the boiler. For example, my worst performing zone comprises three HR92s in the hall/landing/stairs area. This is the first zone on in the morning and the quickest to lose heat. It follows that if I am out of the home for, say, 2 hours and use Economy mode this zone will drive the maximum boiler flow temperature of the boiler which is 70C. The boiler will operate at 70C until the troublesome zone is within the set temperature range. The boiler flow temperature then falls, and the boiler then quickly gets into condensing mode. Arguably, this is one of the most annoying features of Evohome. A single zone heat demand drives the flow temperature which is why we never play with set temperatures. If we need more heat in any given zone, then I do it in 1C increments to maintain boiler efficiency.

    At the moment, I am considering whether I could achieve an even lower usage figure by removing the HR92s and re-fitting standard TRV heads to the hall/stairs/landing area.

  2. #12
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    Quote Originally Posted by rotor View Post
    Wow, I'm shocked how good your figures are, or how bad mine are:

    129.83
    129.91
    130.13
    147.33
    147.33
    129.70
    157.93
    131.01

    Between 4.50 and 5.50 per day!
    Wow, I'm shocked at how good your figures are, or how bad mine are:

    249.11
    241.01
    241.92
    256.37
    267.68
    274.03
    263.24
    270.46

    7 - 8 a day!

    In better news, my gas tariff appears to be about 15% cheaper than yours!
    Last edited by dty; 9th February 2018 at 11:50 AM.

  3. #13
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    Quote Originally Posted by HenGus View Post
    At the moment, I am considering whether I could achieve an even lower usage figure by removing the HR92s and re-fitting standard TRV heads to the hall/stairs/landing area.
    Or the Pegler iTemp i30s which I've just fitted. Like regular TRVs, but digital instead of wax balls, and with schedules so you can do nighttime setback, etc. 18 each, or 4 for the price of 3 from the supplier I found.

  4. #14
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    Quote Originally Posted by dty View Post
    Wow, I'm shocked at how good your figures are, or how bad mine are:

    249.11
    241.01
    241.92
    256.37
    267.68
    274.03
    263.24
    270.46
    Ah, now I feel better, that is dramatically higher than our usage.

    You just made my day.

  5. #15
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    Quote Originally Posted by dty View Post
    7 - 8 a day!

    In better news, my gas tariff appears to be about 15% cheaper than yours!
    Wow! Much bigger house?

  6. #16
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    What figures are you all posting, m3 per month, day Kwh per day?

    I take my readings once a month.

    08.01.18
    126 m3 1417 kwh (average 47.2 kwh/day)

    08.12.17
    123 m3 1384 kwh (average 46.1 kwh/day)

    08.11.17
    44 m3 495 kwh (average 16.5 kwh/day)

    08.10.17
    31 m3 349 kwh (average 11.6 kwh/day)

    08.09.17
    17 m3 191 kwh (average 6.4 kwh/day)

    Before that it was an older boiler.

    That's for a 3 bed semi detached.
    Last edited by robj20; 9th February 2018 at 01:25 PM.

  7. #17
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    My optical spot reader is logging ever 15 minutes. It is one of the most informative pieces of kit that I have bought in recent years.

    My usage for the first four weeks of January was 34 cubic metres; 35 cubic metres; 35 cubic metres and 25 cubic metres. As I said above, I just let the CH system do its own thing and I resist the temptation to fiddle. What I don't know is what beneficial effect Opentherm control is having?

  8. #18
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    Quote Originally Posted by rotor View Post
    Wow! Much bigger house?
    Hard to know! Mine's about 4,000 sqft with old aluminium window frames and some thermal bridging issues (for example, clay window sill tiles with no cavity closers beneath), and a poorly insulated basement.

    There's definitely work to be done!

  9. #19
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    Quote Originally Posted by robj20 View Post
    What figures are you all posting, m3 per month, day Kwh per day?
    That's a good question! Mine were kWh for the first 8 days of February, which I think is what everyone else was posting too.

  10. #20
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    This is where i am kinda struggling......
    I've just had a new heating system, new rads, new pipes & boiler - along with new windows.

    It's a standard 3 bed 1960's semi-detached. but with the image i sent yesterday, i appear to have gone through 14m3 of gas, which i find pretty staggering.

    Anyway, i'm now playing between letting the rooms cool and bringing them back up to temp when needed, as opposed to a decent temp all day long.....

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