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<p>Building Regulations set minimum energy performance standards for heating systems
in new homes and when they are replaced or fitted into existing homes.</p><p> </p><p>Under
these regulations, when a gas combination boiler is installed in an existing dwelling,
an additional energy efficiency measure must also be installed, with passive flue
gas heat recovery systems being one of four options. The English housing stock is
diverse, so the requirement is flexible to allow a suitable choice to be made that
reflects the nature of the building, and the needs of the individual household.</p><p>
</p><p>When these regulations were introduced, many system and most regular boilers
on the market were considered incompatible with passive flue gas heat recovery systems
and compensation controls, or required an additional component, and therefore were
exempt from the additional energy efficiency measures.</p><p> </p><p>For new builds,
buildings regulations around energy efficiency and space and water heating are deliberately
couched in performance terms and do not prescribe the technologies, or fuels to be
used, allowing manufacturers and builders the flexibility to innovate and select the
most practical and cost-effective solutions in particular circumstances.</p><p> </p><p>The
extent to which a passive flue gas heat recovery system can increase the efficiency
of a dwelling and reduce natural gas consumption is dependent on many factors. Analysis
undertaken on behalf of BEIS showed that the typical household could increase boiler
efficiency between 1% to 5% by adding a passive flue gas heat recovery system.</p>
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