30-01-13, 08:21 PM
the only way the combi would affect the shower is if a hot water tap was turned on but its the same if the cold tap is turned on or a toilet is flushed, it can cause a drop in pressure and cause the shower to run hotter.
make sure all the valves on the cold water are fully open and no flow restrictors are fitted, these are mainly fitted to wash basin cold taps.
make sure all the valves on the cold water are fully open and no flow restrictors are fitted, these are mainly fitted to wash basin cold taps.