Now there was some vague blurb in the mixer tap fitting instructions about the water pressures. We have very high water pressure here ~5Bar, and I a quick Google has brought up a single mention of someone seeing something similar, that the pressure of the cold water is going through the valve and back down the hot output.
Can someone elaborate on this? What are my options on how to fix this? Fit a pressure reducer to the cold feed? What sort of pressure will my combi hot side have? I always thought it was the same as the mains pressure when you had a combi....
Mixer PDF: http://www.roperrhodes.co.uk/wp-content/uploads/2012/02/DUAL_TRIPLE-INLINE-SHOWER-VALVE-INSTRUCTIONS7.pdf
"Unbalanced Water Supply Valves must always be operated within either the range for BS 1287 OR BS1111 as described in the table below. Valves cannot operate effectively where a hot or cold pressure system crosses the boundaries of the two ranges. In addition the maximum ratio of unbalanced hot and cold water pressures for the valves to operate effectively is 5:1. Hot or cold pressure must be reduced or boosted so as to work within the required range.
Maximum Water Pressure Concealed Dual and Triple Control shower valves are suitable for use with all water supply systems up to a maximum of 5.0 Bar. Operating pressures above 5.0 Bar will require the installation of pressure reducing valves."
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