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Upgrade options for super q 85/115

  • 11-11-2016 10:01PM
    #1
    ctlsleh
    Registered Users, Registered Users 2 Posts: 791 ✭✭✭


    All,
    My super Q is 15 years old and the thermostat is broken, the boiler is hitting the 85 degree automatic failover........my plumber says there aren't replacements available. And I haven't been able to find any online myself either.

    So looks like I need to upgrade the boiler which I guess is coming to the end of its life anyway.

    I have 2 story 2,600 sq ft detached house with 3 zones (upstairs/downstairs/hot water) TRVs on the rads and 2 nests to control the temp in the zones.

    I'm wondering how to dimension the boiler considering that I don't usually have all 3 zones on together and I know this Impacts the efficiency of the boiler?

    I guess I go for an outside condenser boiler? Any recommendations?


Comments

  • #2
    Tom44
    Registered Users, Registered Users 2 Posts: 953 ✭✭✭Tom44


    Alternative thermostat (approved by firebird) can be fitted, see their Utube video.
    But basically I as a service engineer wouldn't bother.
    New boilers result in a 30% saving on fuel.
    Personal feed back.
    Grant Vortex or Euroflame is the job.
    I would recommended nothing else.


  • #3
    Dtp1979
    Registered Users, Registered Users 2, Paid Member Posts: 12,948 ✭✭✭✭Dtp1979


    How many rads do you have?


  • #4
    ctlsleh
    Registered Users, Registered Users 2 Posts: 791 ✭✭✭ctlsleh


    17 Rads total, 4 small bathroom and about 13 fairly normal size i would say


  • #5
    Dtp1979
    Registered Users, Registered Users 2, Paid Member Posts: 12,948 ✭✭✭✭Dtp1979


    ctlsleh wrote: »
    17 Rads total, 4 small bathroom and about 13 fairly normal size i would say

    I'd install a 50/90 grant vortex onto the system. Powerflush the system beforehand is a must too.


  • #6
    ctlsleh
    Registered Users, Registered Users 2 Posts: 791 ✭✭✭ctlsleh


    the next size up would be the equivalent of the SuperQ 85/115.......do you think the smaller one would work? are there any rule of thumb rules about how a condenser boiler works efficiently?

    appreciate the feedback.


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  • #7
    Dtp1979
    Registered Users, Registered Users 2, Paid Member Posts: 12,948 ✭✭✭✭Dtp1979


    ctlsleh wrote: »
    the next size up would be the equivalent of the SuperQ 85/115.......do you think the smaller one would work? are there any rule of thumb rules about how a condenser boiler works efficiently?

    appreciate the feedback.

    Yes. Slightly undersizing is more much more important. Oversizing a condensing boiler makes it less effeciant


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