Page 2 of 4 FirstFirst 1234 LastLast
Results 11 to 20 of 31

Thread: New boiler day

  1. #11
    Automated Home Legend
    Join Date
    Sep 2014
    Location
    Scotland
    Posts
    1,828

    Default

    OpenTherm I hope ?

  2. #12
    Automated Home Legend
    Join Date
    Jul 2014
    Posts
    1,001

    Default

    So it's being set up as a System Boiler then?

  3. #13
    Automated Home Legend paulockenden's Avatar
    Join Date
    Apr 2015
    Location
    South Coast
    Posts
    1,594

    Default

    Nope. Combi. But with (when the sun's shining) hot water being fed to the boiler on the DHW side, so the boiler doesn't have to add much/any heat.

    Not all boilers allow this, but Intergas is fine with up to 60 degrees.

  4. #14
    Automated Home Legend
    Join Date
    Jul 2014
    Posts
    1,001

    Default

    What are the advantages of running it in this configuration as opposed to a Stored HW solution? Is it simply that you aren't wasting any energy by Storing it, until you actually need it? Also how does the Header tank gets mains pressure? Is that pressurised?

  5. #15
    Automated Home Legend paulockenden's Avatar
    Join Date
    Apr 2015
    Location
    South Coast
    Posts
    1,594

    Default

    Advantage is that the tank doesn't need to be kept at a set temperature, so I can use my PV mop-up in an effective manner.

    It's not a header tank - it's a 120L unvented cylinder, just before the boiler DHW input. At mains pressure.

    So if there's been no/little sun the tank might be quite cool and the boiler will go full-pelt. But if it's been sunny the boiler might not need to come on at all.

    I'll be monitoring temps in the tank, and if it hasn't had a consistent 60+ for an hour over the past 7 days I'll run a manual legionella cycle. Not sure whether to do this via the immersion, or from the boiler (the guys are also connecting the coil in the tank to the heating side of the boiler via a zone valve. I thought I'd re-use my existing Evohome DHW kit to monitor/control this.

  6. #16
    Automated Home Legend
    Join Date
    Jul 2014
    Posts
    1,001

    Default

    Quite clever

  7. #17
    Automated Home Legend paulockenden's Avatar
    Join Date
    Apr 2015
    Location
    South Coast
    Posts
    1,594

    Default

    There's a blending valve between the tank and the boiler which I'll set to about 55 degrees. That way I can take the tank up to quite a high temp in the summer.

  8. #18
    Automated Home Legend
    Join Date
    Jul 2014
    Posts
    1,001

    Default

    If you could draw this, this could be the direction I take, when I need to change.

  9. #19
    Automated Home Legend paulockenden's Avatar
    Join Date
    Apr 2015
    Location
    South Coast
    Posts
    1,594

    Default

    let me see if it works first!

    P.

  10. #20
    Automated Home Legend
    Join Date
    Sep 2014
    Location
    Scotland
    Posts
    1,828

    Default

    Quote Originally Posted by paulockenden View Post
    Not sure whether to do this via the immersion, or from the boiler (the guys are also connecting the coil in the tank to the heating side of the boiler via a zone valve. I thought I'd re-use my existing Evohome DHW kit to monitor/control this.
    The immersion element, entering at the top (I presume ?) will not heat all the water. It will only heat water as far down as it reaches and the rest below that will remain pretty much cold. So unless the immersion element was near the bottom along with the indirect heat exchanger, it wouldn't be suitable for killing Legionella.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •