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Let’s say you’ve got a relatively modern flat with an

Let’s say you’ve got a relatively modern flat with an existing gas combi boiler that needs replacing this might cost £700 for the boiler, £600 for the installation, and another £150 for a magnetic filter, bringing the total to £1,450 – about as cheap an install as you're likely to get add a ‘power flush’ if there happened to be sludge in the system,.

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