If you currently have an electric shower, the solution would be that you would have to replace the shower with a mixer shower which you could then pump to create more pressure. This is because you wouldn’t be able to pump an electric shower as it runs off mains water and doing so would blow the seals on the shower. It may be that you prefer an electric shower as you have a back up option if your hot water ever breaks down. If you’re adamant that you want to stick with an electric shower, but the pressure is poor, firstly, speak to your local water provider to check that your property is getting the minimum required pressure of 0.7 bar. If you are not, you can then look at getting the mains pipe from the road into your house upgraded to make sure your house is getting at least 0.7 bar. If both of the above aren’t an option, install a pump on the mains water coming into the property. We would always advise getting a specialist plumber to do this as if it is done wrong, you can cause yourself all sorts of problems. In turn with this you could also increase your electric shower to a higher KW rating so that the water is heated up faster.