Will it work with my electric shower or combi boiler?

Yes, but you need to check with your supplier if your electric shower or combi boiler can accept a pre-heated water supply. It's not a hot pre-heated supply (such as with a solar system) but more of a pre-warmed supply around 28°C.

Many brands of combi boilers and electric showers are suitable for this. If you are using it with an electric shower then choose one with manual power settings, such as turning down the power consumption to compensate for the pre-heated incoming water. Alternatively some people decide to achieve much higher flow-rates than would normally be possible with an electric shower, especially in the winter months.