The unit (kWh) cost is only one factor.It could cost 5 times as much to heat water via electricity, depending on the exact rates you are paying.
Absolutely, and the SEAI methodology takes that into consideration.The unit (kWh) cost is only one factor.
The efficiency of each option is another for example.
The SEAI table linked above give the view as of July 1st. Electricity prices are also increasing, but I don't think there has been a 300% plus increase in gas prices that would make electric immersion heating cheaper.Hi, with the huge increase in gas prices, do you think it's cheaper now to use the immersion to heat the water tank?
Actually that SEAI table shows that it can be cheaper to heat hot water with electricity if you are using the night rate.The SEAI table linked above
maybe this works if you use power showers with cold feed only. otherwise you’ll run out of hot water by evening, most days,Actually that SEAI table shows that it can be cheaper to heat hot water with electricity if you are using the night rate.
The table shows that the cost per KWh at 100% efficiency for Night time electricity is 11.54 cent. Resistive heaters are 100% efficient.
However the maximum efficiency you could hope for for gas would be 90% and that's being very generous, i.e. assuming your running your condensing boiler at a temperature low enough for the condensing tech to kick in and that your not losing any heat/efficiency moving hot water from the boiler to the the tank.
The table shows the the cost for gas at 80% efficiency or lower, is higher than the night electric rate of 11.54 cent.
There is a very good chance that the efficiency of most boilers combined with the heat losses between boiler and tank are well below 80%.
Also the table shows that the night rate beats oil in every scenario.
In reality there will really be little difference in the costs there. You're still consuming more gas at X% efficiency to provide a set amount of energy to the water tank. The proviso would be where the boiler might short-cycle more due to lower water quantity in the hot water circuit and the time taken to transfer that to the tank contents.If you have an efficient boiler, which you'll be using to heat radiators, then the extra cost of heating water is different to just running boiler to heat water along. So you need to factor that in also.
Good point, I was just using standard rates. I believe that day/night meters are a lot less prevalent among those with gas heating.Actually that SEAI table shows that it can be cheaper to heat hot water with electricity if you are using the night rate
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