seawater jacuzzi onboard

Hi all!!!
We have to install 4 jacuzzi bathtubs on a tourism vessel. All 4 tubs are exposed on the weather deck and all the system must work with seawater. We already have a boiler for the hotwater supply of the 4 systems and we are having a real bad time looking for the heaters of each bathtub. They must be electric and all the suppliers that we have talked to do not have anything that can be used with seawater. i know that there is more than a few of this jacuzzi systems installed on several yachts but i've been unable to get any information regarding suppliers of the bathtubs, recirculating seawater heaters or pumps that use hot seawater and which are installed on those yachts.
does any of you have any idea on who can supply these items?
any info is really appreciated.
cheers
german

 

Electric? Why not a heat exchanger with the engine ...
Did you mean you're looking for the blowers or jets?

 

the electric heater is only to maintain the temperature of the water as it recirculates, for the hot water supply of the tubs we have a boiler.
the tub is not the problem, acrylic or fiberglass is the same, the pump must be seaworthy and also is not a problem but the thing is that electric heater. no supplier that we are aware of have a seawater electric heater of the type we need.
cheers
german

 

As long as you have a seawater pump and circuit, it doesn't matter what type of a heater you use -- just add a heat exchanger.

 

Yep and well make you the stainless steel tub, even made one of aluminium last year.