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There are many ideas that are slowly making their way form the Commercial side to domestic but obviously on a small scale. Headers of various types, for example, have been used in the Commercial side for many years.I understand that this still should be put in place however with the use of variable speed modern pumps set to reduce their speed as the pressure increases the likely hood is the by-pass would never open.
The more you think about the modern system designs the more I see the case for hydraulic separation, the cost of using Close Coupled Tees is small compared to LLH but it may explain why Vaillant are pushing them in the M.Is.
Many thanks to all for your input to this.