Electric Shower Fault

Look, this is just a theory. I am just guessing what goes on inside one of these things:

What sort of water area do you live in?

It sounds like the element is getting too hot because it cannot transfer heat quickly enough to the water.

With little or no flow, the water temperature thermostat controls operation. Thus the element is mostly off.

With a lot of flow, the water temperature thermostat seldom operates so the heating element is mostly on. After a couple of minutes on full power, the element heats to the point that its safety sensor trips out. It simply cannot transfer heat to the water fast enough, because of the insulating effect of the crud that has built up on it over the years.

As I said, just a theory. If it cuts out with just a trickle from the output, then that theory is shot down in flames!

Getting 8 years out of one of these sounds pretty reasonable. I didn't know they lasted that long.

Thanks for the replies. Guess after 8 years I'll cut my losses and buy a power shower!

The chaps at showerdoc.co.uk are really helpful and helped me diagnose a problem with my Triton over the phone. The spares they sell are reasonably priced. Based in Edinburgh I think but do mail order.

--Dan