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Heating hot water - immersion vs LPG boiler

  • 02-02-2023 6:05pm
    #1
    Sue de Nimes
    Registered Users, Registered Users 2 Posts: 151 ✭✭


    My wife and I bought a house a year ago. We had to get a new boiler fitted before we moved in. As a result of this we got a brand new A rated boiler from Wocester Bosch and a brand new hot water cylinder. The energy rating of the boiler is as follows :

    Useful efficiency

    At rated heat output and high temperature regime 88,2%

    At 30 % of rated heat output and low temperature regime 97,3%

    The boiler is fueled by LPG from Flogas which is charged by volume rather than kWh. We recently moved to a new electricity tariff with heavily discounted rate between 2am and 4am (66% off the day rate price)

    This is the first home we have lived in that didn't have a combi boiler so we are trying to get our head around things a bit. At the moment with rising costs, we have reduced the amount of hot water we are using. We are only heating a cylinder of water from cold once or twice a week for showers and then handwashing in cold water for the rest of the week.

    Does anyone know for sure price wise if we would be better off running the immersion on a timer for two hours each night during the low cost period? How much hot water would that generate as I know it only heats water at the top of the tank?

    The SEAI has a fuel cost comparison which lists LPG as costing roughly 15.48 per kWh and night rate electricity as 11.83 per kWh. Those rates are adjusted for goverment heating rebates.



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