If their customer service isnt helpful, I highly recommend considering an Ariston heater. A few year back we were having so many issues with our water heater too and we switched to Ariston- the customer service and followups from their installers were great and we havent had problems in years! Good luck!

If you are thinking of changing heaters, you might consider using the digital water heater from A. O. Smith. They are reliable because they have the top technologies from USA. Plus, you will be able to control from a touch screen. no more switch problems. Renotalk forum thread >> http://www.renotalk.com/forum/topic/72618-a-o-smith-the-no-1-water-heater-in-usa/

Hi sorry for using a dated post. 

I'm trying to change my water heater switch too. But I have a problem here:

The old switch has 2 earth wires wired to 2 slots, but the new switch I just bought to replace it has only 1 earth slot! What am I to do with the extra earth wire? 

Many thanks!