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Target Flow temp on Vaillant Boiler

Discussion in 'Plumbing and Central Heating' started by RK_London, 6 Mar 2021.

  1. RK_London

    RK_London

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    I'm trying to figure out the best target flow setting for my Vaillant Ecotec plus 637 boiler.

    What is the acceptable range? It's been set at 55C right now - return is around 40C
     
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  3. muggles

    muggles

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    55 is fine. Ideally your return should be 20°C lower than your flow but that can be difficult to achieve with a system boiler.
     
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  4. RK_London

    RK_London

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    Thanks for your help - will leave setting at 55C
     
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