Immersion heater element burns out

[mutley11]

My immersion heating element seems to burn out every 1.5 years. The hot water in the flat is provided by the immersion heater and an electric shower.

I have replaced the immersion heating element with a titantinium one but it still seem to burn out just as regularly.

Is this normal?

 

[Mike2007]

Whats the supply voltage in your property? You may have a higher voltage than allowable, I have measured up to 260vac on domestic. Your immersion will be rated 230vac, which would reduce lifespan if high.
Loose terminals in circuit?

 

[mutley11]

Whats the supply voltage in your property? You may have a higher voltage than allowable, I have measured up to 260vac on domestic. Your immersion will be rated 230vac, which would reduce lifespan if high.
Loose terminals in circuit?

I don't think it is a voltage problem as I have another flat in the same block and that does not have a problem.

The element gets replaced every 1.5 years so I don't think anything can be loose in the wiring as this gets replaced when the immersion heater gets replaced.

 

[Mike2007]

Whats the supply voltage in your property? You may have a higher voltage than allowable, I have measured up to 260vac on domestic. Your immersion will be rated 230vac, which would reduce lifespan if high.
Loose terminals in circuit?

I don't think it is a voltage problem as I have another flat in the same block and that does not have a problem.

The element gets replaced every 1.5 years so I don't think anything can be loose in the wiring as this gets replaced when the immersion heater gets replaced.

It's a dedicated radial circuit so nothing much to check. Have you changed timer or mcb to rule these out?
I would check voltage at mcb position the voltage at immersion, see what difference there may be.

 

[simond]

Is it the E7 element at the base of the cylinder?

If so, frequent failure is often down to the immersion touching a pile of limescale in the base and overcooking the element in this position.