If I'm reading my electricity bill correctly, I pay about 13 cents per kWh.
So, 2.4kW x 4 hours x 13c = $1.25.
Can that be right? If so, it seems much cheaper than gas.
I'd argue that electric HLTs/kettles are cheaper to run than gas (considering the cost of each). Being billed quarterly for electricity (especially when you're running home heating etc off it) makes it feel more expensive I guess. Gas bottles are generally in the mid-20s to fill, but can be $10 higher if you don't/can't shop around...