How can I prevent my shower water from turning colder when someone turns on the kitchen sink?
What you are experiencing is referred to as a water pressure drop. This may be due to the size and condition of your water distribution piping, low static and residual water pressure or the quality or working condition of your shower valve. I suggest that if your domestic water system is fed by a public water service, you should contact the water department and inquire about the water pressure in your area. Low water pressure can sometimes be solved with a water pressure booster pump. You also may want to consider increasing the size of your water distribution mains and risers which will improve the volume of water available. If your plumbing system is not of historical significance, you might consider replacing old brass and lead piping that may be clogged with build up on the interior of the pipe walls. However, if your shower valve is old, non-balancing or is not functioning properly, it would be far less expensive to replace the shower valve than make any of the modifications above
