Marine Water Calorifier

The Steam and Electric Marine Water Calorifier is a state-of-the-art hot water generation system, engineered to provide the ultimate flexibility for marine and offshore applications. This advanced dual-power unit features integrated heating elements for both steam and electric operation, ensuring a continuous, reliable supply of hot water for crew accommodation, galleys, sanitary facilities, and service needs, regardless of the vessel’s primary power source or operational status.

By combining two independent heating methods into a single, compact calorifier, this system offers redundant hot water generation. If steam is unavailable (e.g., when the auxiliary boiler is offline), the electric heating elements seamlessly take over, and vice versa. This dual-fuel capability eliminates single points of failure and guarantees hot water availability in all conditions, enhancing crew comfort and operational efficiency.

Intelligent Control & Uncompromising Safety

The calorifier is equipped with advanced WTZK-50-C automatic temperature controllers, which precisely maintain the domestic hot water temperature within the optimal range of 50-65°C. This prevents scalding, maximizes energy efficiency, and inhibits bacterial growth (e.g., Legionella). A critical float level switch provides comprehensive safety protection by automatically cutting power to the electric heating elements if water levels drop, preventing costly and dangerous dry heating damage.

Designed to meet the most stringent international standards, this unit is available with certification from all major classification societies, ensuring seamless integration into any vessel’s engineering system.

Key Features & Benefits

✅ Dual Heating Technology (Steam & Electric): Provides unparalleled operational flexibility and redundancy. The unit can run on steam when the boiler is operational, and switch to electric power when the boiler is offline or in port, ensuring a continuous hot water supply.
✅ Intelligent Automatic Temperature Control: Precision WTZK-50-C controllers automatically regulate the heating process, maintaining the water temperature consistently within the safe and efficient 50-65°C range.
✅ Comprehensive Dry Heating Protection: A critical float level switch continuously monitors the water level. If the water level falls below a safe point, the system instantly cuts power to the electric heating elements, preventing burnout and extending the unit’s lifespan.
✅ Energy-Efficient Segmented Heating: The electric heating system utilizes segmented heating technology, allowing operators to activate only the required number of heating elements. This reduces peak power demand and optimizes energy consumption based on real-time hot water needs.
✅ Robust Marine Construction: Built to withstand the vibration, shock, and corrosive atmosphere of marine environments, ensuring long-term reliability.
✅ Global Certification Ready: Designed and tested to meet the requirements of major IACS classification societies, including ABS, BV, DNV, LR, CCS, and others. Certification can be provided upon request.
✅ Comprehensive Size Range: Available in capacities from 0.12 m³ to 1.0 m³ to suit a wide variety of vessel sizes, from small workboats to large passenger ships.

Technical Specifications

Model	ZDR-0.12	ZDR-0.2	ZDR-0.3	ZDR-0.5	ZDR-1.0
Capacity (m³)	0.12	0.2	0.3	0.5	1.0
Working Pressure	0.4 MPa (60°C)	0.4 MPa (60°C)	0.4 MPa (60°C)	0.4 MPa (60°C)	0.4 MPa (60°C)
Design Pressure	0.44 MPa	0.44 MPa	0.44 MPa	0.44 MPa	0.44 MPa
Test Pressure	0.68 MPa	0.68 MPa	0.68 MPa	0.68 MPa	0.68 MPa
Safety Valve Setting	0.42 MPa	0.42 MPa	0.42 MPa	0.42 MPa	0.42 MPa
Steam Heating Capacity	275 kg/h	450 kg/h	750 kg/h	1200 kg/h	3250 kg/h
Steam Consumption	27.5 kg/h	45 kg/h	75 kg/h	120 kg/h	325 kg/h
Electric Heating Capacity	180 kg/h	360 kg/h	540 kg/h	720 kg/h	900 kg/h
Electric Power	12 kW	24 kW	36 kW	48 kW	60 kW
Voltage Options	AC380V/50Hz/3φ or AC440V/60Hz/3φ

Applications

This versatile marine calorifier is the ideal solution for providing reliable domestic hot water on a wide range of vessels and offshore installations:

Merchant Vessels: Cargo ships, container vessels, tankers, and bulk carriers requiring reliable hot water for crew.
Passenger Ships & Ferries: Meeting the high-demand hot water needs of hundreds of passengers and crew.
Offshore Platforms: Providing hot water for accommodation modules, galleys, and sanitary facilities.
Workboats & Tugs: Ensuring crew comfort during extended operations.
Naval & Government Vessels: Meeting stringent reliability and safety specifications.
Luxury Yachts: Delivering a continuous supply of hot water for a premium onboard experience.

Frequently Asked Questions (FAQs)

Q1: Why would a ship need both steam and electric heating in a single calorifier?
A: This dual-power design provides redundancy and operational flexibility.

Redundancy: If the ship’s boiler is down for maintenance, the electric heating can still provide hot water. If the ship is in port and does not want to run a boiler, electric power is used.
Flexibility: It allows the operator to choose the most economical or available heat source at any given time (e.g., using waste heat recovery steam when underway, and shore power when in port).

Q2: What is the purpose of the float level switch, and why is it critical?
A: The float level switch is a critical safety device for the electric heating elements. It monitors the water level inside the tank. If the water level drops below the top of the electric heating elements (e.g., due to a leak or draining), the switch sends a signal to the control panel to immediately cut power to the heaters. This prevents the elements from running dry and burning out, which could cause a fire or severe damage to the calorifier.

Q3: How does the segmented electric heating technology save energy?
A: Instead of having one large, single-stage heating element that is either fully on or off, segmented heating divides the total power into multiple, independently controlled stages (e.g., a 60kW unit might have three 20kW stages). The automatic controller activates only the number of stages necessary to maintain the set temperature based on hot water demand. This avoids wasteful full-power cycling and reduces sudden, large electrical loads on the ship’s generator.

Q4: What is the difference between steam heating capacity and electric heating capacity?
A: The table shows the hot water production rate for each heat source.

Steam Heating Capacity (e.g., 275 kg/h): This means that when using steam, the calorifier can heat 275 kg (liters) of cold water to the set temperature every hour.
Electric Heating Capacity (e.g., 180 kg/h for the 12kW model): This is the hot water production rate when using electric power. Note that steam typically has a higher heating capacity due to its high latent heat, making it faster for bulk heating. Electric is ideal for maintaining temperature and providing hot water when steam is unavailable.

Q5: What classification society certifications are available?
A: The Steam and Electric Marine Water Calorifier can be manufactured and certified to meet the rules of all major IACS (International Association of Classification Societies) members. This includes, but is not limited to, ABS (American Bureau of Shipping), BV (Bureau Veritas), DNV (Det Norske Veritas), LR (Lloyd’s Register), CCS (China Classification Society), RINA, and NK (Nippon Kaiji Kyokai) . Please specify your required certification when ordering.

Q6: Why is the working pressure listed as 0.4 MPa at 60°C?
A: The working pressure of 0.4 MPa is the design pressure for the water side of the calorifier at the normal operating temperature of 60°C. The steam coil inside the calorifier will have its own pressure rating (typically higher). The safety valve, set at 0.42 MPa, protects the tank from over-pressurization, for example, if the temperature control fails and the water continues to heat, causing expansion and pressure rise.

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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