What document contains the legal requirements for the energy efficiency of new domestic hot water systems?

The Building Regulations Part L1 specifically addresses the legal requirements concerning the energy efficiency of new domestic hot water systems. This regulation outlines the energy conservation measures that must be implemented within the construction and renovation of homes, ensuring that new hot water systems meet established performance standards. Part L1 is focused on the conservation of fuel and power in dwellings, thus promoting efficient energy use which is critical for reducing carbon footprints and energy costs in residential buildings.

The other documents mentioned, while related to energy efficiency and renewable energy, do not primarily serve the function of outlining specific legal requirements for domestic hot water systems. The Building Services Compliance Guide provides broader guidance on compliance with the Building Regulations, but it does not singularly focus on hot water systems. The Energy Efficiency Act encompasses various aspects of energy efficiency across multiple sectors but isn’t specific to domestic hot water. The Renewable Heat Incentive Guidelines pertain to financial incentives for renewable heat technologies, rather than the legal performance standards mandated for domestic hot water systems.