i have fitted variouse electrical heating systems, yes they can be expensive but they can also be cheaper than gas depending on which system you go for. IMO stay away from the water system,i believe these usually use a electric boiler?
the “brick” systems are storage heater, these typically run on you off peak electricity so they charge up at night on the cheaper electric, these arnt all that expensive to run but the down fall is once they use up there heat thats it untill the next day, so they get some getting use to, its not as bad as i make out so its something to look into
the other option that i have fitted recently and look very nice is a oil filled system that look like really fancy radiators. these can heat up anytime but they can be expensive but if you get your electricity meter change to a “economy 10” system you can run the system cost effectivly.
any system be it gas or electricity is expensive but if you make your house well insulated ie cavity, loft, double glazing etc they can work very well, hope this helps