Electric Heating Calorifier

DRG Series Electric Marine Hot Water Heating Calorifier

The DRG Series Electric Marine Hot Water Heating Calorifier is a cutting-edge solution designed to provide dependable, high-quality hot water for a wide range of maritime applications. Leveraging advanced electric heating technology, this professional-grade marine hot water heater is specifically engineered to integrate seamlessly with the freshwater pressure systems on vessels of all types, from small workboats to large commercial ships and offshore platforms.

Operating with fully automated intelligence, the DRG Series automatically draws water from the ship’s freshwater tank and heats it to the ideal temperature to meet all onboard domestic hot water demands—including crew accommodations, galley services, and sanitation facilities. With its comprehensive set of safety systems and energy-optimized operation, our marine hot water heater guarantees a consistent flow of hot water while maximizing energy efficiency and minimizing operational costs.

Designed for Effortless Integration and Reliable Performance

The DRG Series is engineered for straightforward installation into existing shipboard freshwater systems. Once connected, the system operates autonomously, requiring minimal crew attention. The combination of robust marine-grade construction, intelligent temperature management, and multiple safety redundancies ensures that hot water is always available when needed, regardless of vessel motion or operating conditions.

Intelligent Temperature Management System

✅ Dual Precision Temperature Controllers: Employs two WTZK-50-C pressure temperature controllers for highly accurate and redundant temperature regulation, ensuring water is heated precisely to the desired level.
✅ Automatic Heating Activation Mechanism: Heating elements are automatically powered on when water temperature dips below 50°C, guaranteeing hot water availability exactly when needed.
✅ Smart Shut-Off Function: Once water temperature reaches the optimal 65°C, the heating process automatically stops, preventing overheating and maximizing energy savings.
✅ Real-Time Visual Monitoring: Integrated pressure gauges and thermometers provide continuous, at-a-glance information about system status, allowing easy monitoring of pressure and temperature levels.
✅ Safety Pressure Release Valve: A dedicated safety valve activates at 0.42 MPa to prevent system over-pressurization, ensuring safe operation under all conditions.
✅ Crucial Safety Installation Note: During installation, it is strictly prohibited to insert raw material tapes or sealants into the safety valve inlet to ensure proper valve function in emergency situations.

Advanced Protection Mechanisms

✅ Float Level Switch Protection: Automatically cuts power to heating elements when water level drops below the safe operating minimum, preventing catastrophic damage from dry-running (dry-fire protection).
✅ Dual Control Modes: Offers both manual and automatic operation settings, providing flexible management options for routine operation, maintenance, and testing.
✅ Segmented Heating Technology: For units with multiple heating elements, staggered activation effectively manages power load, reducing strain on the vessel’s electrical system and preventing sudden power surges.
✅ Comprehensive Dry-Fire Prevention System: Multiple integrated protections safeguard against operation with inadequate water supply, ensuring longevity and safe operation of the calorifier.
✅ Thermal Overload Protection: Prevents heating elements from exceeding safe operating temperatures.
✅ Over-Pressure Protection: Safety valve automatically relieves excess pressure to maintain system integrity.

Technical Specifications

Model	DRG-0.12	DRG-0.2	DRG-0.3	DRG-0.5	DRG-1.0
Capacity (m³)	0.12	0.2	0.3	0.5	1.0
Working Pressure (at 60°C)	0.4 MPa	0.4 MPa	0.4 MPa	0.4 MPa	0.4 MPa
Design Pressure	0.44 MPa	0.44 MPa	0.44 MPa	0.44 MPa	0.44 MPa
Test Pressure	0.66 MPa	0.66 MPa	0.66 MPa	0.66 MPa	0.66 MPa
Safety Valve Setting	0.42 MPa	0.42 MPa	0.42 MPa	0.42 MPa	0.42 MPa
Inlet Temperature	15°C	15°C	15°C	15°C	15°C
Outlet Temperature	65°C	65°C	65°C	65°C	65°C
Operating Range	0~65°C	0~65°C	0~65°C	0~65°C	0~65°C
Design Temperature	80°C	80°C	80°C	80°C	80°C
Heating Capacity	180 kg/h	360 kg/h	540 kg/h	720 kg/h	900 kg/h
Electrical Power	12 kW	24 kW	36 kW	48 kW	60 kW
Insulation Thickness	40 mm	40 mm	40 mm	40 mm	40 mm
Galvanized Steel Thickness	0.7 mm	0.7 mm	0.7 mm	0.7 mm	0.7 mm
Power Supply	AC380V/50Hz/3φ or AC440V/60Hz/3φ

Operation & Setup Instructions

Temperature Calibration

Set the low-temperature controller to activate at 50°C.
Configure the high-temperature controller to deactivate at 65°C.

Safety Valve Configuration

Precisely adjust the safety valve to open at a pressure of 0.42 MPa. This ensures that in over-pressure conditions, the valve automatically releases pressure, maintaining system safety.

Normal Operation Procedure

Open both inlet and outlet water valves to establish water flow.
Activate the heating system through the control panel.
The system will automatically maintain water temperature between 50-65°C.
Continuously monitor system operation through integrated gauges and indicators.

Applications

The DRG Series Electric Marine Hot Water Calorifier is essential for providing domestic hot water on a wide range of vessels:

Commercial Vessels: Cargo ships, container vessels, tankers, bulk carriers
Offshore Platforms: Oil rigs, FPSOs, accommodation barges
Passenger Vessels: Ferries, cruise ships, passenger vessels
Naval Vessels: Frigates, destroyers, support ships
Workboats & Tugs: Towing vessels, construction support craft
Fishing Vessels: Small to large commercial fishing boats
Yachts & Mega-Yachts: Luxury vessels requiring premium hot water systems

Frequently Asked Questions (FAQs)

Q1: Why does the DRG Series use two temperature controllers (WTZK-50-C) instead of one?
A: The dual WTZK-50-C controllers provide critical redundancy and precision:

Redundancy: If one controller fails, the other continues to regulate temperature, preventing system shutdown or overheating.
Independent Operation: One controller manages the lower set point (50°C activation), while the other manages the upper limit (65°C deactivation), creating a fail-safe control loop.
Accuracy: Dual controllers allow for more precise temperature maintenance within the desired range, optimizing energy consumption and ensuring consistent hot water supply.
Safety: This dual-controller configuration meets the stringent safety requirements of classification societies for redundant critical systems.

Q2: What is “dry-fire prevention,” and why is it critically important?
A: Dry-fire prevention refers to protection systems that prevent the heating elements from operating when there is insufficient water in the tank. If electric heating elements are energized without being fully submerged in water, they can reach extreme temperatures within seconds, leading to:

Catastrophic element failure: Elements burn out and must be replaced.
Tank damage: Excessive heat can damage internal coatings or warp the tank.
Fire hazard: Overheated elements can ignite nearby materials.
The float level switch is the primary dry-fire protection device, immediately cutting power if water level drops below safe minimums.

Q3: What is segmented heating technology, and how does it benefit vessel operations?
A: Segmented heating technology divides the total heating power into multiple independently controlled stages. For example, a 60kW unit might have four elements (2×12kW + 2×18kW). Benefits include:

Reduced Peak Power Demand: Instead of drawing 60kW suddenly, stages activate sequentially, reducing the electrical load on generators.
Precise Temperature Control: The system can match heating output exactly to demand by activating only the necessary stages.
Extended Element Life: Reduced thermal cycling and more gradual operation extend component lifespan.
Improved Power Factor: Better management of electrical load improves overall system efficiency.

Q4: Why is it prohibited to use sealing tape on the safety valve inlet during installation?
A: This is a critical safety warning. The safety valve is designed to open at a precise pressure (0.42 MPa) to relieve over-pressure conditions. If sealing tape (PTFE tape) or other sealants are applied to the inlet threads, small pieces can break off during installation or operation and lodge in the valve mechanism, potentially:

Preventing the valve from opening when over-pressure occurs, leading to tank rupture.
Preventing the valve from closing properly after opening, causing continuous leakage.
Blocking the sensing port, rendering the valve inoperable.
Only thread sealant approved for safety valve applications should be used, applied carefully to avoid ingress into the valve body.

Q5: How does the calorifier integrate with the ship’s freshwater pressure system?
A: The DRG Series is designed for seamless integration:

Cold Water Inlet: Connects directly to the vessel’s freshwater pressure system downstream of the hydrophore tank, receiving water at typical system pressure (0.36-0.38 MPa recommended).
Automatic Operation: As hot water is drawn from the system, pressure drops, and cold water automatically enters the calorifier from the pressure tank—no additional pumps or controls are typically needed for the feed water.
Hot Water Distribution: Heated water flows to all consumption points through the vessel’s hot water distribution piping.
Return Circulation: When a circulation loop is installed, a dedicated pump returns unused hot water to maintain immediate availability at distant fixtures.

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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