Single storage heater, would it be worthwhile?

[ericmark]

What does oil cost me, I really don't know, but to make it last a little longer, so only one fill up per year, would improve things, and we have off-peak for 5 hours per day, so is oil less than 8.5p/kWh? And would the heater say a 2 kW version, last 19 hours? I have a large hysteresis in the living room, so a heater giving a little out all the time, may reduce the hysteresis, but is it worth it? Would not want to change from Octopus "Go" to "Economy 7" so if it would not last 19 hours likely non-starter, but it is a thought, not looked at how much a storage radiator stores?

Tried websites answer I got was

Thanks, Eric. That's a great question! Our Fischer Heat-Only Electric Boiler is a zero-emission, 100% efficient heating system that is manufactured in Spain and comes with a 5-year warranty. It is available in 7.5 to 21-kilowatt options and is nearly silent, making it ideal for home use.

Which was simply not answering the question.

I was actually involved in making the bricks, but I never worked out how much they stored. That website was clearly not going to help, god knows what size a 7.5 kW storage heater is, must be massive, unless they don't know the difference between kW an kWh. I did find this

So it would not fully charge in 5 hours, but looking at the smallest as an example, one would hope it would not simply give out 500 watts for 14 hours, the instructions I found says "Minimum heat output (indicative)" 0.0 kW" can't believe that's true with a fully charged unit, and settings seems to be room temperature, which is not really what I want, the oil will top up the temperature as required, but I suppose 99 watts is still within 0.0 kW? But same for all models. At 268 watts ((1020x5)/19) it should help a little with the hysteresis.

However that's the same as swapping to tungsten lights, so not sure if really worth the effort?