It may but last night I was looking at the system schematic and can't figure out why the injection pump inlet is taken from the boiler return (NRV in boiler flow), this means that if no demand for DHW or radiators that the injection pump, is fighting the boiler circ pump (which is on the return), very UNlikely designed that way, have another good look at the arrow on the injection pump which may be pointing upwards, the pump would then be returning cold water to the boiler but then there would need to be (probably controlled ) a hot water supply to the UFH main manifold somewhere, if you look at the schematic which includes the DHW cylinder you will see some form of controller that looks a bit like a pump but is probably a controller as it seems to be wired into the kanmor? high up in the drawing, can you identify this as well this evening.
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