Horizontal cylinder indirect immersion heating element burnt out

[diybazza]

The solar PV isn't connected directly to the hot water cylinder in anyway. It works by using a sensor that detects if power is being export or imported to the grid, so if the Solar PV is generating more than is being used in the house power will be exported to grid. There is a control box that sits between the mains and the immersion heater and depending on the amount of power being exported allows between 50w – 3kw to the immersion. The idea is that no excess power is exported to the grid and is utilised to heat water in the cyclinder.

Regarding the position of the immersion, my first thought was would the level of the water drop below the elements at any point which sounds like it wouldn’t from the replies. It does not look like sufficient heat was being dispersed as mentioned earlier.

I am going to contact RM today and see what advice they give.

Thanks