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There is a small expansion vessel on the front of the boiler. I thought that this would indicate that it was a sealed system. I think that the tank is a cold feed tank. I asked my daughter if there was an immersion heater fitted and she said there wasn't. Please excuse my vagueness but...

I visited my daughter in Chester this week. On arrival the tank overflow was discharging hot water and steam over the front door - not a pleasant welcome! The boiler is a powermax 155xP sealed system i think. I climbed in the loft and found that the vent was discharging into the tank. I...