Marine Electric Calorifier

The Marine Electric Calorifier (DRG Series) is a high-performance, electrically heated hot water system specifically engineered for marine and offshore applications. Designed to utilize electricity as the primary energy input, this advanced calorifier provides a reliable and efficient supply of heated fresh water for crew accommodations, galleys, sanitary facilities, and various service requirements on all types of vessels and offshore platforms.

Whether installed on commercial cargo ships, passenger ferries, offshore platforms, workboats, or naval vessels, the DRG Series ensures that crews have access to a consistent supply of hot fresh water for showers, washing, cleaning, and other essential daily needs—enhancing onboard living conditions and operational efficiency.

Engineered for Marine Environments

Constructed with marine-grade materials and precision-engineered components, the DRG Series is built to withstand the harsh realities of the marine environment—constant vibration, high humidity, corrosive saltwater atmospheres, and variable operating conditions. Every unit undergoes rigorous testing to ensure reliable performance throughout its service life.

Seamless Integration with Shipboard Systems

The DRG Series is designed for straightforward integration into existing vessel freshwater systems. With standardized connection interfaces and dual-voltage power compatibility (AC380V/50Hz/3ph or AC440V/60Hz/3ph), these calorifiers can be installed on vessels operating in any region of the world with minimal modification.

Key Features & Benefits

✅ Electric Heating Operation: Clean, efficient, and reliable hot water generation using the vessel’s electrical supply—ideal for vessels where steam is unavailable or as a supplement to steam systems.
✅ Wide Capacity Range: Available in capacities from 0.12 m³ to 1.0 m³ to suit vessels of all sizes—from small workboats to large passenger ships and offshore platforms.
✅ Consistent Hot Water Output: Delivers heated water capacity from 180 kg/h to 900 kg/h (depending on model), ensuring adequate supply for crew accommodations and service needs.
✅ Precision Temperature Control: Maintains outlet water temperature at 65°C with inlet at 15°C, providing comfortable hot water for all domestic applications.
✅ Robust Pressure Ratings:
- Working Pressure: 0.4 MPa (at 60°C)
- Design Pressure: 0.44 MPa
- Test Pressure: 0.66 MPa
- Safety Valve Setting: 0.42 MPa
✅ Global Power Compatibility: Operates on either AC380V/50Hz/3ph or AC440V/60Hz/3ph power supplies, adaptable to electrical systems worldwide.
✅ Effective Thermal Insulation: 40 mm insulation layer with 0.7 mm galvanized steel outer cladding minimizes heat loss, improving energy efficiency and reducing operating costs.
✅ Standardized Connection Interfaces: Pre-engineered connections (DN25-DN40) simplify installation and integration with shipboard piping systems.
✅ Comprehensive Temperature Range: Designed for working temperatures from 0-65°C with design temperature of 80°C, providing operational flexibility.

Technical Specifications

Main Technical Parameters

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 (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
Insulation Thickness (mm)	40	40	40	40	40
Outer Galvanized Sheet Steel (mm)	0.7	0.7	0.7	0.7	0.7
Electricity Supply	AC380V 50Hz 3ph / AC440V 60Hz 3ph

Connection Interfaces

Model	Cold Water Inlet	Hot Water Outlet	Water Return Interface	Discharge Outlet
DRG-0.12	DN25	DN25	DN25	3/4″
DRG-0.2	DN25	DN25	DN25	3/4″
DRG-0.3	DN32	DN32	DN32	3/4″
DRG-0.5	DN32	DN32	DN32	1″
DRG-1.0	DN40	DN40	DN32	1″

System Integration

Piping Configuration

Cold Water Inlet: Connects to the vessel’s freshwater pressure system (typically downstream of hydrophore tank).
Hot Water Outlet: Supplies heated water to the ship’s distribution network for crew accommodations and service areas.
Water Return Interface: For circulation systems that maintain hot water availability at distant fixtures.
Discharge Outlet: For draining the tank during maintenance, inspection, or winterization.

Operating Principle

Cold water enters from the freshwater pressure system.
Electric heating elements activate when temperature drops below set point.
Water is heated to the regulated outlet temperature (65°C).
Hot water is distributed to all consumption points.
Safety systems (pressure relief valve, temperature controls) ensure safe operation.

Applications

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

Commercial Vessels: Cargo ships, container vessels, tankers, bulk carriers
Offshore Platforms: Oil rigs, FPSOs, accommodation barges, drilling platforms
Passenger Vessels: Ferries, cruise ships, passenger catamarans
Naval Vessels: Frigates, destroyers, support ships, auxiliary vessels
Workboats & Tugs: Towing vessels, construction support craft, anchor handlers
Fishing Vessels: Small to large commercial fishing boats
Yachts & Mega-Yachts: Luxury vessels requiring premium hot water systems
Dredgers & Specialized Craft: Dredging vessels, cable layers, research ships

Frequently Asked Questions (FAQs)

Q1: What is the difference between an electric calorifier and a steam calorifier?
A: The fundamental difference is the heating method:

Electric Calorifier (DRG Series): Uses electric heating elements submerged in the water to generate heat. Ideal for vessels with ample electrical capacity, no steam generation capability, or as a supplement to steam systems when the boiler is offline.
Steam Calorifier: Uses steam coils or a steam-to-water heat exchanger, requiring a boiler or waste heat source.
The DRG Series electric calorifier offers simpler installation, cleaner operation, and easier maintenance compared to steam systems, with the trade-off of higher electrical consumption.

Q2: How do I select the correct DRG model for my vessel?
A: Model selection depends on your vessel’s peak hot water demand and crew size:

DRG-0.12 (180 kg/h): Small vessels, workboats, tugs with 5-10 crew
DRG-0.2 (360 kg/h): Medium vessels with 10-20 crew
DRG-0.3 (540 kg/h): Vessels with 20-30 crew
DRG-0.5 (720 kg/h): Vessels with 30-40 crew or higher demand
DRG-1.0 (900 kg/h): Large vessels with 40-60+ crew, passenger vessels, extensive galley/laundry facilities
Consider both storage capacity (for peak demand events) and heating capacity (recovery rate). Our technical team can assist with detailed calculations.

Q3: What are the standard connection sizes, and how do they integrate with shipboard piping?
A: The DRG Series features standardized connection sizes:

DRG-0.12 & 0.2: DN25 (1″) connections for cold/hot water and return
DRG-0.3 & 0.5: DN32 (1.25″) connections
DRG-1.0: DN40 (1.5″) cold/hot inlet/outlet, DN32 return
These standard marine pipe sizes integrate seamlessly with typical shipboard freshwater systems. The discharge outlets (3/4″ or 1″) connect to bilge or drainage systems for maintenance drainage.

Q4: What safety features protect the DRG Series from overpressure or overheating?
A: The DRG Series incorporates multiple independent safety systems:

Safety Valve: Set to open at 0.42 MPa, automatically releasing pressure if the system exceeds safe limits.
Temperature Controllers: Maintain precise temperature control, preventing overheating.
Float Level Switch: Prevents dry-firing by cutting power if water level is inadequate.
Thermal Overload Protection: Protects heating elements from excessive temperature.
Pressure Gauges: Allow continuous visual monitoring of system pressure.
Test Pressure: Factory tested to 0.66 MPa (150% of working pressure) to verify structural integrity.

Q5: What maintenance does an electric calorifier require?
A: Regular maintenance ensures optimal performance and longevity:

Monthly: Visually inspect for leaks, check pressure gauge readings.
Quarterly: Test safety valve operation (manual lift), inspect electrical connections.
Annually: Drain and inspect tank interior for sediment, inspect heating elements for scale buildup, verify temperature controller calibration, test float switch operation.
Every 2-3 Years: Replace sacrificial anodes if fitted (depending on water chemistry).
Every 5 Years: Consider professional internal inspection and pressure testing during dry-docking.

Q6: Can the DRG Series be used in conjunction with a steam heating system?
A: Yes. While the DRG Series is specifically designed as an electric calorifier, it can be installed alongside a steam calorifier as part of a dual-power hot water system. Common configurations include:

Primary Electric + Backup Electric: For redundancy.
Primary Steam + Electric Backup: Where steam is primary during voyage, electric used in port.
Electric for Accommodation + Steam for Service: Separate systems for different applications.
For true dual-power (steam + electric in a single tank), consider our ZDR Series Dual-Power Calorifiers.

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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