Would like to know what is the ideal water flow rate through each Underfloor heating circuit. We normally have two manifolds per house. Each manifold would have approximately 10 circuits, each circuit would be 100 metres long, and internal bore of pipe would be a half an inch. The pipe would be buried in a 4 inch concrete screed.. The flow rates should be adjusted in the following way: Fully open all Blue coloured valves located on each port of the return (Bottom) section manifold, by winding them anti-clockwise. flow through the underfloor heating loops: Loop Length: Flow Meter Percentage Open: 0 to 25 metres: 25% Open: 25 to 60 metres: 50% Open: 60 to 85 metres: 75%.

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First, however, you’ll need to check the flow rates and introduce heat to the newly laid floor slowly. Start off by looking at your plans for the system to find the desired flow rate. This will vary for each wet underfloor heating system so its important that you find yours and apply it as per instructions.. Underfloor Heating System receives water from a heat source such as a boiler or heatpump. High temperature water from a source like a conventional boiler is then blended to reduce the flow temperature. It is then distributed via a manifold to heating circuits made up of Speedfit Barrier Pipe. Low temperature water, such as from a Heat Pump, may