Is it worth installing an electric shower?

Our showers are expensive and often run out of hot water, so we’re thinking of replacing themEvery week a Guardian Money reader submits a question, and it’s up to you to help him or her out – a selection of the best answers will appear in next Saturday’s paper.We have two showers running off a hot water tank. We’re spending a fortune, and often run out of hot water. Would installing the latest electric showers be better? I’m told they no longer look ugly, or j