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DHW heating

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  • 29-07-2020 8:32pm
    #1
    worlds goodest teecher
    Registered Users Posts: 1,107 ✭✭✭


    Just moved from apartment with gas heating to a bungalow where I replaced the old oil boiler with 26kW Grant Vortex oil boiler. Installed an apt timer to the cylinder and a 2 channel controls to the boiler. The water cylinder has a Willis heater. In terms dhw heating I assumed the the cheapest way to heat water for dishes/showers/etc would be to stick the apt timer on for half an hour, cheaper electricity than oil. I asked the plumber and he told me otherwise. Is this because the whole cylinder is being heated?


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    #2
    worlds goodest teecher
    Registered Users Posts: 1,107 ✭✭✭worlds goodest teecher


    worlds goodest teecher wrote: »
    Just moved from apartment with gas heating to a bungalow where I replaced the old oil boiler with 26kW Grant Vortex oil boiler. Installed an apt timer to the cylinder and a 2 channel controls to the boiler. The water cylinder has a Willis heater. In terms dhw heating I assumed the the cheapest way to heat water for dishes/showers/etc would be to stick the apt timer on for half an hour, cheaper electricity than oil. I asked the plumber and he told me otherwise. Is this because the whole cylinder is being heated?

    Anyone?


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    #3
    Pkiernan
    Registered Users Posts: 4,315 ✭✭✭Pkiernan


    worlds goodest teecher wrote: »
    Anyone?

    Electricity is the most expensive way to heat a home and DHW.


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    #4
    dathi
    Registered Users Posts: 1,386 ✭✭✭dathi


    electricity costs between 13 and 19 cents per kwh depending on your supplier ,
    kerosene costs 49 cent per litre there are 10 kwh in one litre of kerosene but your boiler is only 90 percent efficient and if you allow another 10 percent for losses in pipe work that still leaves you with 8 kwh at a cost of 49 cent or 6.1 cent per kwh


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    #5
    John.G
    Registered Users Posts: 3,466 ✭✭✭John.G


    If only 1 or 2 people in house and just using the dual immersion (sink element) or the Willis switched on for 30 mins (timer) during the summer months gives 30 litres at 60C = 60 litres at 40C (from cold at 20C), consumes 1.4 kwh, cost 28 cents/day, would you bother with the oil/gas heating to save 10/20 cents/day??.


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    #6
    worlds goodest teecher
    Registered Users Posts: 1,107 ✭✭✭worlds goodest teecher


    So I hit the boost on the timer for the hot water for say 30min, it heats what is in the Willis heater first before starting to heat the storage tank for the remainder of the boost?


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    #7
    John.G
    Registered Users Posts: 3,466 ✭✭✭John.G


    The Willis heater actually will heat the whole cylinder eventually as it takes the cold water from the bottom of the cylinder and then sends the hot water to the top, now as I am not familiar with them then I'm not sure if the water will be heated to 60C as it travels to the top of the cylinder but I would think so, so just put on your boost for 30 mins and see how hot the water is.


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