Hard water and shower

[MattMagnolia]

We are planning an en suite and want an electric shower but the builder says that it won’t last a year with our hard water. The main bathroom has no shower. DH thinks our junior combi boiler can’t cope with a new radiator plus a shower.
Is the builder right?

We had electric showers for a while and eventually swapped as they needed replacing more often than seemed reasonable . . . . hard water area.

the new radiator will have no effect on the shower.

A shower from a combi will be about three times as powerful as an electric shower, unless you have poor water flow or some other defect.

About the only good reason for getting an electric shower is that you can use it when your combi breaks down.

If you get one, have it mounted on the surface of the wall after tiling (not built in) and preferably with surface mounted chrome pipes, so it is easy to replace when it fails.

Unless you already have a suitable RCD protected circuit, you will need a qualified electrician to install one.

p.s.

and start saving up for a water softener. Once you've had one you will never go back.

Keep the water temperature below 60 degrees. Limescale precipitates out of solution at that temperature.