what kind of plumber is he then? if he don't know a basic answer like that.
don't care if you had four set to 50 they will all still cut out at 50 degrees. not 200
you need to change the stat in the bottom immersion it is faulty and not shutting off a 50
plus your stats should be set to 60 not 50 for health reasons
hi-spec plumbing
July 2007
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