Tank in stainless steel AISI 316.

Exchanger in stainless steel AISI 316, its a large exchanger surface allows a huge production of hot water exploiting at best the  heat of the cooling water coming from the boat engine. 

Resistance in INCOLOY (800/1200 W)

Isolation expanded polyurethane. Reduces the heat lost to 1°C for hour within 24 hours.

External casing in stainless steel (bright type) resistant to the saltiness.

Safety valve it protects the boiler from possible excessive pressure.