Storage heating is the cheapest form of heating to install, it also the most difficult to control and pricy.
This is very true.
But being in an appartment has advantages when it come to heating, such as:
1) They are generally smaller than a house so you have less space to heat and less = cheaper.
2) Each appartment that yours borders gives it great insulation, so it is quicker to heat and retains the heat for longer.
3) Modern appartments have good quality windows that give great insulation.
For the reasons stated above I would expect you would not have to use them a whole lot to keep your appartment nice and warm (thanks to global warming too!).
Many people now get rid of them and use the supply for the storage heaters to power electric underfloor heating. It give great control, but does not work so well under carpet and even less well under wooden floors! Also underfloor heating can be pricey to install, but it is a super job.
I am not a big fan of storage heaters myself! Just trying to list a few advantages. It would not stop me buying the appartment, but the price would have to be alot less than one with gas fired central heating!
BTW you will have to heat your water electrically too!
how cheap(expensive?) are they to run?
You can work out the cost per hour. 1kW for 1 hour = 1 unit on your ESB bill. Check out the unit cost, it is avaiable on line. The rating of each storage heater can be calculated by looking at its size and comparing it to the leaflet that you can get from a wholesaler. Most storage heaters used in Ireland are made by Dimplex. Perhaps you can get the rating on line also.
You should be using your storage heaters at night on the cheaper rate i.e. night storage rate. This would be if you have a dual tariff system, you should check this.