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Thanks. The immersion that was replaced was the Booster, which I am not using. The noise is coming from the main immersion which hasn't been replaced. The replacement was an off the shelf model - no idea of the cost as this is being done on insurance. Have switched the whole system off until the...

I have an Elson Coral E thermal store with 2 immersions - one is a booster which I never use and the other is the main controlled by a timer. The booster immersion sits in the middle of the tank, the main sits under it near the bottom. After 3 years the booster immersion has just had to be...