ATI Marine Water Heater 12L (Stainless, 230V/Engine Heat)

The ATI 12L marine water heater brings the comfort of hot water on board, providing warm showers, dishwashing water, and more for your boat. The Italian company A.T.I. is renowned for the efficiency and high reliability of their marine water heaters, as well as their great durability. Constructed from stainless steel, this 12-liter calorifier is built to withstand the harsh marine environment – it will not corrode even with constant exposure to salt air and water.

• Dual Heating System: This water heater features an electric heating element (approximately 1200W at 230V) that quickly heats the water when the boat is connected to shore power or using a generator. In addition, it has a built-in coil heat exchanger that can connect to the engine’s cooling system – as your engine runs and warms up, it simultaneously heats the water in the heater without any extra electrical load. This dual setup ensures you have hot water under all conditions – at the dock (via electricity) or underway (via engine heat).
• Fast Heating & Heat Retention: A high-surface-area heat exchanger coil and a powerful heating element together provide rapid heating of the entire 12-liter volume. The tank is wrapped in thick closed-cell polyurethane foam insulation to minimize heat loss – meaning the water stays hot for hours after the heater is turned off. You could heat water in the evening and still enjoy a warm shower the next morning.
• Safety & Control: The heater comes with an adjustable thermostat to set your desired water temperature, as well as an integrated safety cut-off that prevents overheating by shutting off the element if the temperature exceeds a safe limit. Additionally, a pressure relief valve (rated around 7 bar / 700 kPa) is included – it will release excess pressure if necessary to protect the tank from overpressure. You can have peace of mind that the system is safeguarded even when you’re not monitoring it constantly.
• Quality Materials & Build: The inner tank (where the water is stored) of this 12L model is entirely made of AISI 316 stainless steel, which resists corrosion and scaling. The outer casing is also stainless steel for the 12L version, giving extra durability and a polished look. (By comparison, larger ATI models use an aluminum outer shell with porcelain-lined steel interior – but this 12L unit is fully stainless.) The all-stainless construction makes it exceptionally long-lasting – capable of withstanding vibration, shocks, and continuous use in a marine setting.
• Compact and Easy to Install: With a diameter of about 320 mm and a length of ~387 mm, the 12L ATI heater is relatively compact and can be mounted horizontally. It’s typically installed in the engine room or a technical compartment on board. Mounting brackets are included for secure installation. The electrical hookup is straightforward – the unit comes with a pre-wired cable to the heating element. Connecting to the engine’s cooling circuit is done via standard hose barb fittings on the heat exchanger coil. All necessary safety valves and fittings are provided in the kit to make installation as simple as possible.
• Hot Water on Board – Comfort of Home: With the ATI 12L installed on your yacht or motorboat, you gain a touch of luxury – a warm shower after a swim, hot water for washing dishes, or making hot beverages. This water heater is engineered to withstand marine conditions and to serve your crew reliably for years. It brings the convenience of home to the sea, enhancing your boating experience with readily available hot water whenever you need it.