I have a pressurised heating system with a Megaflow and small red pressure cylinder in the airing cupboard upstairs.
I have recently emptied and refilled the Megaflow due to poor hot water flow, particularly from the bath mixer tap, and this has now improved no end.
However the hot water flow from the bath mixer and thermostatic shower starts off strong then gradually reduces. The cold water flow from the bath has also reduced.
All other taps including the bathroom basins are fine.
Any ideas on the problem?