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Hi and thanks for all your comments. Some comments in return: - the pressure does drop by anything between 0.1 and 0.4 bars and we find that we're topping up about once a week. A boiler installer has suggested that, because of this, there's probably a big leak somewhere and that this is the...

Hi. We're desperate for help. We had a Glow worm 38cxi combi boiler fitted from new three years ago. It has broken down at least 30 times since. Glow worm says it's because of our system introducing magnatite into the boiler and clogging the heat exchanger. However, water tests are showing...