I hold sea pressure issues when more than two hot hose down faucets are human being used.? There are no problems using one hot water, and one cold wet,...
There are no problems using one hot water, and one cold wet, only when in that are two hots being used.
Answers: are you on a ably? are you on city water ?
theres a pressure regulator at the marine meter, or after it some where on the stripe, or if on a well turn the considerable screw down, or the regulator,
check to insure the valve at the sea heater is fully embark on. Other than that, it sounds like the lines are too small.