Hi all. First time poster I live in a new build development of flats that has a communal heating system. Hot water is generated centrally - then pumped to us. That hot water then heats cold water in an indirect hot water cylinder setup. We have underfloor heating powered by the centrally heated water too. We've just had engineers visit each flat individually to powerflush debris that was supposedly in the pipework.  From day 1 my underfloor heating always seemed slow to warm up an