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AlexCarp
NO ONE HERE and that includes you, have countered what I have put forward. All the plumbers have done is throw insults as they have no to little knowledge or know-how. They all say it is too big when it went down to 12 kilowatts and now we know it can go down to 5 kilowatts. Only a fool would recommend selling this new boiler and spend a fortune on a small boiler that does no more.