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A single zone underfloor heating system is for any one area of floor that is controlled by one room thermostat. This area can have any number of loops of pipes and is connected to one manifold. A single zone system is ideal for conservatories, basements and extensions. If you would like to have underfloor heating in more than one area and control it using two or more thermostats see How a Multi Zone System Works
When the underfloor heating is just one zone you would control the flow of warm water into the manifold, this is done using a zone valve, electronic water sensor and a thermostat. When connecting to a combination boiler the radiator circuit will need to be on its own zone valve and thermostat creating a two zone system.
To see how a single zone system works with your system see drawings at the bottom of the page.
If you are connecting the underfloor heating to a system boiler which also runs a hot water cylinder these will already be zoned (one zone radiators and one zone hot water), here you just add the underfloor heating manifold with a zone valve making your system three zones altogether.
When your programmable room thermostat calls for heat (turns on) water passes through the zone valve into the manifold where the water is circulated through continuous lengths of pipe embedded in the floor.
The temperature of the water in the underfloor heating system will typically run at 50°c and your radiator system at 75°c.
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