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Intergas boiler

Discussion in 'Plumbing and Central Heating' started by Mike2007, 10 Apr 2019.

  1. bernardgreen

    bernardgreen

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    How many metres of hot water pipe is there between your boiler and the tap ?

    If it is more than a couple of metres then the heat in the hot slug of water will be dissipated by heating up the pipe.

    then the aluminium mass of the heat exchanger will be hotter than 70°C, the static water in the DHW coil in that mass of aluminium will also be that hot.
     
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  3. ianmcd

    ianmcd

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    you post some shoite
     
  4. bernardgreen

    bernardgreen

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    Then educate me .... instead of being rude explain where I am wrong,

    Explain to me and other readers how it is that boilers can contravene the laws of science,

    ....
     
  5. vulcancontinental

    vulcancontinental

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    My point was you mentioned with your great experience you,'ve never seen a child burnt by a central heating boiler so intimated it couldn't exist. I showed you a picture of one, I didn't photoshop it, it's part of many dhw training courses as well as the fatalities I mentioned although they were through immersion in water.

    You dig up a post 5 months later of a car crash.

    If the boiler heating can be set deliberatly or inadvertently to a flow temperature of 70, 80 or 90 degrees then it can be. That's all.

    Knock yourself out.
     
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  6. wizbongre

    wizbongre

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    I'll weigh in on this debate with some real-life experience... We had an Intergas Xclusive 36 installed a couple of months ago. Temp for CH is set to 70 and DHW is set to 55 - I don't recall what the max temp's are in the installer settings, I assume factory default, i.e. I could manually set both CH and DHW higher than they are now. There is no WeatherComp.

    I have noticed a number of times the hot water at a tap will be very very hot, with the mentioned initial slug, especially when the CH is running. We have one tap in particular, which is on a sink in our kitchen, probably only 1m from the boiler, which delivers raging hot water initially. You also notice it when using a thermostatic shower - if you turn the water off mid-shower, when you start it again you get a slug of hotter water, before the shower 'stat and/or boiler bring it back to target temp.

    I'm intrigued to know if "properly setup" means more than just setting the CH & DHW max flow temp's, i.e. there is more involved in commissioning such a boiler?
     
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  8. bernardgreen

    bernardgreen

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    When delivering hot water to the Central Heating flow the heat exchanger's mass of aluminium has to be a degree or two above the temperature set for the Flow temperature.

    The DHW coil is in the same mass of aluminium and therefor the temperature of the water in that coil is very close to the temperature set for the Central Heating flow.

    If boilers with this type of dual circuit ( CH and DHW ) heat exchanger are installed into a heating sytem with large radiators and low temperatue flow then the hot slug is a lesser problem.

    Hence this type of boiler is ideal for new builds and renovations where a new heating system ( new large radiators etc ) can be installed and Central Heating flwo can be set to a lower temperature

    Retrofitting this type of boiler into an existing system with conventionally small ( high temperature ) radiators will always have the "hot slug" when DHW is called for while the CH is operating.
     
    Last edited: 28 Oct 2019
  9. vulcancontinental

    vulcancontinental

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    Yes, get an experienced Intergas trainer installer to set the boiler up, they should ensure a safe hot water temperature. It is possible to set the heating temperature very high which of course would also increase the domestic hot water temperature or initial ‘slug.’
     
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  10. ianmcd

    ianmcd

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    Totally agree
     
  11. bernardgreen

    bernardgreen

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    I also agree, but a low heating temperature could result in the heating system being un-able to provide acceptable heating.
     
  12. Tadlad

    Tadlad

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    Actually is 36 years in the NHS many years with kids and I have seen just about everything in that time and if you had read my review earlier of the Xtreme I did say it needs setting up by someone who knows what they are doing. ANY boiler set up wrongly is potentially very dangerous. I am glad that you as installer take your responsibilities very seriously and looking through this and other forums when researching boilers there are many CH installers posting I wouldn't let fix a hole in my bucket never mind install a CH system.
     
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