Recent content by MacroPhotoFly

I'll follow up with the test to identify how/many litres per min turns on the boiler, but this morning things took a turn for the worse. In the midst of shower this morning (after a few cycles of the usual on/off heat at the boiler end - which the shower usually manages to iron out to a steady...

Can't confirm it is actually on full, I admit. But through peep hole I can see burner comes on and stays at that flow until the point it turns off completely - then cycles between those two states (plus the fact the water goes burning hot, when "hot water temp" dial is on lowest setting)

Sure - binary in the sense the boiler seems to be 'on' or 'off' (cycling between those states) when the hot water tap is flowing , rather than moderating the gas flame to keep a constant temperture to the hot water.

It is a thermostatis shower (I'll dig details out later) but the problem exists on all hot taps (i.e. run a hot tap, it goes very hot, then cools down, then heats up, then cools down, etc). The other thing I would note is that the hot taps need to be on high flow before the boiler kicks in...

Summary - The gas seems to come on full to heat hot water, gets to a temperature then turns fully off, restarting moments later when (obviously) the water has dropped in temperature. Hence the hot water in the pipe goes up and down temperature like a yoyo. Water temp is very hot (>65 degs) when...