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Modern new boilers are more efficient for several reasons

Modern new boilers are more efficient for several reasons, but their main advantage is that they are all condensing boilers all well-maintained boilers burn their fuel very efficiently, but they inevitably lose some heat in the hot gases that escape up the flue a condensing boiler has a larger heat exchanger, so it recovers more heat, sends cooler gases up the flue and is more efficient.sometimes.

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