Simple all-electric vented system in small flat. Immersion thermostat cut-out kept tripping, a special nuisance as the flat has a tenant. Plumber changed the stat but it didn't fix the problem. Here's the twist: Plumbing was about 40 years old and probably furred up so we replaced the ENTIRE SYSTEM - cylinder (stainless), immersion element, stat and time switch - and it still trips! Any ideas?
