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HWA publishes heat network guidance for hot water storage systems

New document looks at specific options on the market for heat networks that make use of stored hot water in each dwelling; warns that ‘one size fits all’ solution is not available for industry

The Hot Water Association (HWA) has set out new guidance for its members on ensuring more efficient and effective use of hot water storage systems in heat networks.

Recommendations in the guidance are intended to support heating system and hotwater engineers, as well as heat network designers, to understand the implications of implementing heating systems that incorporate stored hot water in every dwelling.

The 2018 HWA guidance looks exclusively at systems that store domestic hot water in each property linked to a network. However, the document notes that there are a range of options available on the market that provide different methods for storing energy in heat networks. These options include integrated thermal stores.

The guidance document noted, “As heat networks can range from a couple of dwellings running off a central heat source to larger district heating systems that feed thousands of consumers, it is important to note that there is no ‘one fits all’ design solution.”

“Within heat networks, stored hot water solutions have been used for many years. In recent times there has been a drive in the heat network industry to promote the benefits of generating hot water instantaneously whilst underestimating the benefits of the stored hot water solution.”

The 2018 guidance is intended to provide a design methodology for installers that details the key factors to consider in the planning process all the different possible options for stored hot water systems on the market that can be used in each dwelling.

Guide writer Ian Robinson, a HWA member and technical manager of special applications for Baxi, said of the guide document, “System designers should consider the design and usage profile of the building along with the local infrastructure to choose the correct solution. When you consider the strategic aim to decarbonise fuel it is clear that no one solution fits all. Retrofitting existing systems will also play an important part in this aim.”

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