Electric Marine Water Heater
Ensure a constant and reliable supply of hot water for your crew with our efficient marine hot water heater, a durable and cost-effective solution designed specifically for the marine environment. This shipboard water heater is ingeniously designed to maximize energy efficiency by utilizing waste heat recovery from the vessel’s existing systems.
The unit operates by using waste hot water from the boiler or the main engine cooling system as the primary heating source. This waste heat is transferred via a heat exchanger to raise the temperature of fresh water for domestic use, providing hot water for drinking, washing, and sanitary purposes for the people on board. By harnessing this otherwise lost energy, the waste heat calorifier significantly reduces the electrical load on the vessel’s generators.
For times when the main engine is not running or additional heating is required, the tank is equipped with an electric heating element as a backup. This ensures hot water is available 24/7, regardless of the engine or boiler status. This series of domestic hot water tanks is designed to integrate seamlessly with your existing fresh water pressure tank system, using the freshwater supply from the pressure tank to replenish the heater automatically.
Key Features & Benefits
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Waste Heat Recovery: Utilizes waste heat from the boiler or main engine jacket water to heat fresh water, significantly reducing onboard energy consumption and fuel costs.
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Dual Heating System: Combines waste heat recovery with an electric heating element backup, ensuring a reliable hot water supply even when the main engine is not operating.
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Integrated Design: Designed to work in conjunction with the vessel’s fresh water pressure tank, using the freshwater supply for automatic replenishment.
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Robust Marine Construction: Built to withstand the marine environment with a galvanized steel outer sheet and thick thermal insulation layer to minimize heat loss.
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Safety Certified: Designed and tested to meet stringent marine safety standards, with specified working, design, and test pressures.
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Multiple Capacities: Available in a range of sizes from 0.12 m³ to 1.0 m³ to suit vessels of various sizes, from small workboats to large commercial ships.
Working Principle
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Heat Source: Hot water from the boiler or main engine cooling system circulates through a heat exchanger coil inside the tank.
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Heat Transfer: The waste heat is transferred to the fresh water stored in the tank, raising its temperature without mixing the two water systems.
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Fresh Water Supply: The tank is continuously replenished by the vessel’s fresh water pressure tank, ensuring a constant supply.
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Electric Backup: When the waste heat source is insufficient or unavailable, built-in electric heating elements automatically maintain the water temperature.
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Distribution: Heated fresh water is then distributed to galley sinks, showers, and washrooms throughout the vessel.
Technical Specifications
Our DRG Series marine hot water tanks are available in five standard capacities to meet different vessel requirements.
| Parameter | Model: DRG- | ||||
|---|---|---|---|---|---|
| 0.12 | 0.2 | 0.3 | 0.5 | 1.0 | |
| Capacity (m³) | 0.12 | 0.2 | 0.3 | 0.5 | 1.0 |
| Working Pressure (MPa) | 0.4 (at 60°C) | 0.4 (at 60°C) | 0.4 (at 60°C) | 0.4 (at 60°C) | 0.4 (at 60°C) |
| Design Pressure (MPa) | 0.44 | 0.44 | 0.44 | 0.44 | 0.44 |
| Test Pressure (MPa) | 0.66 | 0.66 | 0.66 | 0.66 | 0.66 |
| Safety Valve Open Pressure (MPa) | 0.42 | 0.42 | 0.42 | 0.42 | 0.42 |
| Water Inlet Temperature (°C) | 15 | 15 | 15 | 15 | 15 |
| Water Outlet Temperature (°C) | 65 | 65 | 65 | 65 | 65 |
| Working Temperature (°C) | 0–65 | 0–65 | 0–65 | 0–65 | 0–65 |
| Design Temperature (°C) | 80 | 80 | 80 | 80 | 80 |
| Heated Water Capacity (kg/h) | 180 | 360 | 540 | 720 | 900 |
| Electrical Heating Power (kW) | 12 | 24 | 36 | 48 | 60 |
| External Thermal Layer Thickness (mm) | 40 | 40 | 40 | 40 | 40 |
| Outer Galvanized Sheet Steel Thickness (mm) | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 |
| Electrical Supply | AC380V, 50Hz, 3φ / AC440V, 60Hz, 3φ |
Frequently Asked Questions (FAQ)
1. How does a waste heat calorifier work on a ship?
A waste heat calorifier (hot water heater) captures thermal energy that would otherwise be lost. Hot cooling water from the main engine or steam/water from the boiler is circulated through a heat exchanger coil inside the storage tank. This coil transfers heat to the domestic fresh water stored in the tank, warming it for crew use without any mixing of the two water systems. This is a highly efficient way to produce hot water using “free” energy.
2. What happens when the main engine is not running?
Our marine hot water heaters are equipped with an electric heating element as a backup. When the vessel is in port or the main engine is off and no waste heat is available, the electric heater automatically activates (either manually or via thermostat) to maintain the water temperature at the desired level, ensuring a continuous supply of hot water for the crew.
3. How does this tank connect to my existing freshwater system?
The DRG Series hot water tank is designed to integrate seamlessly with a standard marine fresh water pressure tank system. The freshwater pressure tank supplies cold water under pressure to the inlet of the hot water heater. As hot water is drawn from the top of the tank for use, the pressure from the freshwater system automatically refills the tank with cold water at the bottom, which is then heated.
4. What are the available power supply options for the electric heating element?
To suit the electrical systems of different vessels, the electric heating elements are available for both common marine voltages. The standard options are AC380V, 50Hz, 3-phase and AC440V, 60Hz, 3-phase. Please specify your vessel’s electrical system when ordering.
5. What sizes are available, and how do I choose the right one for my vessel?
We offer five standard models with capacities ranging from 0.12 m³ to 1.0 m³ (120 liters to 1000 liters). The heated water output ranges from 180 kg/h to 900 kg/h. The right size depends on the number of crew and the expected hot water demand. For example, a smaller workboat with a crew of 5-10 might use the DRG-0.12, while a large cargo ship with a crew of 30+ would require the DRG-0.5 or DRG-1.0. Contact us for assistance in sizing.
Attention please: The description was copied from different cooperating manufacturers. The description may be different with the goods, please check with us when order.
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