question for the experts we have underfloor heating in some of the downstairs- all done with new slab floors etc last year so I’m happy the insulation etc is done right. The kitchen (about 5mx5m) struggles to keep about 20 deg when it’s proper cold outside. The system is set to about 50deg for the water (reading off the manifold gauage) and I’m reluctant to go much higher as I “understand” there is risk to the slab if it is too hot. The floor is latex then covered in karndean. It is running off a grundfoss UPM3 pump and I have determined from the manual that it’s on the lowest (presumably) flow setting PP1 as per the pic below. My question (finally got there !) is whether I can simply select a higher flow (PP2 or 3) without risking damaging the pipework? Any of our plumbing experts use these pumps ? Thanks in advance !