It depends on whether it's gas or oil fired central heating, whether you have double glazing or not, what type of construction the house is, how many appliances you have and use and how often.
At the moment, we pay out €55 per month every month for central heating, which is gas fired, we have it equalized through the year, that's for a 4 bed timber framed terraced house with double glazing. Our electricity bill is less, and amounts to €50 per month equalized over the year. We would have dishwasher, washing machine, oven, fridge, tumble drier, 2 televisions etc.
Our last house was older and less energy efficient and we forked out almost double for both major utilities.
HTH