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Older openvented noncondensing boilers take air in from

Older, open-vented non-condensing boilers take air in from inside your home newer, sealed condensing systems take air directly from outside this means that a newer sealed condensing boiler will normally take in cleaner air and be better at retaining energy. When it comes to installation you might want to start with energy companies like british gas for a quote but you should also look at independent.

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