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Cost of Heating Water

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  • 09-05-2019 8:15pm
    #1
    Griffinx
    Registered Users Posts: 496 ✭✭


    Can anyone tell me if its cheaper to heat water using a gas boiler or using an immersion on night rate electricity


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    #2
    Wearb
    Moderators, Home & Garden Moderators Posts: 6,231 Mod ✭✭✭✭Wearb


    Unless it's a more than normal amount, the differences will be small.

    Please follow site and charter rules. "Resistance is futile"



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    #3
    ercork
    Registered Users Posts: 177 ✭✭ercork


    See rough calculations in post 29 of thread below. Divide electricity cost by 2 for night rate:

    https://www.boards.ie/vbulletin/showthread.php?t=2057977343&page=2


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    #4
    John.G
    Registered Users Posts: 3,474 ✭✭✭John.G


    Wearb wrote: »
    Unless it's a more than normal amount, the differences will be small.

    It would be interesting to get some reasonably accurate temperature readings of the flow&return temperatures both at the cylinder and at the boiler with a GAS fired boiler which normally is mounted indoors. I have a (external) 20 kw oil fired boiler and there is ~ 5c pipework loss which at my flow rate of 11.5 LPM equates to 4kw which further reduces the (SE boiler) efficiency from ~ 80% to 64%.

    Gas boilers modulate so it would be pretty normal for a 25kw boiler to be running at 6kw when the HW cylinder is getting up to temperature. A pipework loss of even 2.5C (2kw) will reduce the boiler efficiency (at the 6kw output) to 70% so night rate electricity is IMO very competitive under these running conditions and will be cheaper if the pipework losses are > 2kw.


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