Has anyone taken an under floor heating system straight off a combi or heat only gas boiler without using a blending valve or mixing header ? If so, did it work & was there any problems with the boiler controlling the water temperature? The boiler operating temp range can be fixed (heating side only) to 50 - 30deg C on the board. I know the limitations on the boiler pump but it is a very small circuit & there in maybe another problem as the heating load at -3degC is only around 3.5kW, the boiler has an anti-cycling timer which hold it off for 3mins but just not sure if this will work correctly. Help Please, thanks Chris.