Hi We recently had our bathroom installed, with a Sottini screw valve(not ceramic) bath shower mixer taps, the hot is gravity fed from the hot tank about 1 metre away on roughly the same level, with the cold water tank about
2.5 metres above. The cold is on the mains with a Caleffi pressure limiting valve with a dial on it on which the current selected pressure is 0.5 bar. We began noticing that the hot did not come out first thing in the morning, it would take upto a couple of minutes before which nothing comes out, then with a bit of turning off and on(not sure if that really affects) the hot comes out. After we came back from holiday we turned the hot on and it took about 20 minutes to come out! Please can anyone tell us what may be the problem? Our builder suggested the tap may be faulty???Thanks,
Martin