h2o

i have a potable water tnk beneath the cabin sole amidship which i have drained there are 2 pmp stations at the galley sink the inboard is now dry when pumped the outboard pump still pumps water where is the tank this water is coming from???/// all help much appreciated

I currently have my hot water heater patched into the fresh water side of my engine and am planning to put in a Espar Hydronic D5. At this time, I'm considering plumping it so my radiators will have the ability to heat the boat (and H2O heater) when motoring using engine heat or the diesel...