Low-temperature hydronic systems require a different design and installation approach.
Following the 2022 update to Building Regulations Approved Document L, systems in new builds and refurbishments must operate at ≤55°C flow temperature, and ≤45°C where heat pumps are used.
This CIPHE techtalk presents An Introduction to Low-Temperature Hydronic Heating Systems, a new CIPHE Plumbing Engineering Services Design Guide.