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Looking at it more closely, the way the installer has wired it, the immersion was also coming on with the gas, not good as the cable is not upto 3kw! Thank you for your help, you have lit the path to a result, it's all pretty clear now :-)

Thank you this is what I was thinking, the original installer has used the bottom stat for the gch rather that the one above, so if I move it up and use the bottom for full immersion that will be as it's supposed to be.

Pics of Tank... Full View Upper Panel Lower Panel

I'll add when home It's deffo an indirect,the direct has a 2nd immersion heater in the middle panel

Yes it's a proper Optimersion

Hi all I have a OSO indirect 170 tank on GCH and would like to wire up the immersion to use excess energy off the solar with a special switch unit. I cannot find a manual for the older units, mine has 2 access panels, bottom one with thermo and heaters and middle one with just thermo It...