My 1990 has the water heater installed beneath the galley drawer cabinet, there are 2 drawers and a slatted door just to the right of the sink, below the cutting board. Engine coolant hoses run into the bilge and up to the Yanmar 3GM30F.
I exchanged email with Pacific Seacraft and they have also installed them behind the wet locker in the head.?
Daryl()
Daryl Clark