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I have two showers in my house. **ALL heat and hot domestic water is provided by oil fired boiler** Only one shower can be used at a time or the pressure drops to a trickle. In fact if one is in use and hot water is turned ANYWHERE else in the house the same thing happens. There is a mixing valve in the system as well as a circ pump. Finally, the overalll pressure is slighter better in cold supply than hot water. Any ideas?