Marine Calorifiers – Compact, Reliable Hot Water Storage for Boats
Ideal for:
- Yachts and narrowboats
- Offshore support vessels
- Houseboats and liveaboards
- Commercial marine applications
Built to order in the UK, our marine calorifiers are designed to handle the demands of life on the water. Whether you’re fitting out a narrowboat, yacht, or commercial vessel, each unit is manufactured to your exact requirements: the right capacity, the right connections, and the right configuration.
Durable Construction: We use thicker copper as standard. This means they are better equipped to handle high pressure and are built to last. Every bespoke boat unit has excellent pressure resistance and long-term reliability, ideal for demanding marine environments.
Flexible Orientation: Choose between horizontal or vertical designs to suit your available space and layout.
High-Efficiency Coils: Our finned copper coils deliver fast, efficient heat transfer, optimised for both boiler and engine circuits.
Information on our Industrial Calorifiers can be found here.
Built to Your Specification
Every marine calorifier we produce is made to order. That means no off-the-shelf compromises. If your installation calls for a specific capacity, unusual dimensions, or a particular connection arrangement, we’ll build it.
Our copper construction is thicker than standard, giving you better pressure resistance and long-term reliability in demanding marine environments.
Got a bespoke requirement? Contact our sales team, and we’ll work through the details with you.
Specification Example
| Maximum Working Pressure | 3.0 BAR |
| Test Pressure | 5.0 BAR |
| Max Coil Working Pressure | 3.5 BAR |
| Coil Test Pressure | 7.0 BAR |
| Coil Heating Surface | 0.54m² |
| Material Gauge (*Dependent on cylinder diameter) | 1.2 - 1.8mm* |
| Insulation Thickness (Nominal) | 25mm |
Size Guide
| Imperial Size (Inch) | Metric Size (mm) | Overall Metric Size (mm) | Litres | Gallons |
|---|---|---|---|---|
| 18x12 | 450 x 300 | 500 x 350 | 28 | 6.2 |
| 24x12 | 600 x 300 | 650 x 350 | 38 | 8.4 |
| 30x12 | 765 x 300 | 815 x 350 | 48 | 10.7 |
| 33x12 | 850 x 300 | 900 x 350 | 51 | 11.3 |
| 36x12 | 900 x 300 | 950 x 350 | 58 | 12.9 |
| 18x14 | 450 x 350 | 500 x 400 | 34 | 7.6 |
| 24x14 | 600 x 350 | 650 x 400 | 48 | 10.7 |
| 30x14 | 765 x 350 | 815 x 400 | 62 | 13.8 |
| 33x14 | 850 x 350 | 900 x 400 | 67 | 14.9 |
| 36x14 | 900 x 350 | 950 x 400 | 76 | 16.9 |
| 18x15 | 450 x 375 | 500 x 425 | 38 | 8.4 |
| 24x15 | 600 x 375 | 650 x 425 | 54 | 12.0 |
| 30x15 | 765 x 375 | 815 x 425 | 70 | 15.6 |
| 33x15 | 850 x 375 | 900 x 425 | 75 | 16.7 |
| 36x15 | 900 x 375 | 950 x 425 | 86 | 19.1 |
| 18x16 | 450 x 400 | 500 x 450 | 42 | 9.3 |
| 24x16 | 600 x 400 | 650 x 450 | 60 | 13.3 |
| 30x16 | 765 x 400 | 815 x 450 | 78 | 17.3 |
| 33x16 | 850 x 400 | 900 x 450 | 84 | 18.7 |
| 36x16 | 900 x 400 | 950 x 450 | 97 | 21.6 |
| 18x18 | 450 x 450 | 500 x 500 | 42 | 9.3 |
| 24x18 | 600 x 450 | 650 x 500 | 73 | 16.2 |
| 30x18 | 765 x 450 | 815 x 500 | 97 | 21.6 |
| 33x18 | 850 x 450 | 900 x 500 | 104 | 23.1 |
| 36x18 | 900 x 450 | 950 x 500 | 120 | 26.7 |
| 42x18 | 1050 x 450 | 1100 x 500 | 141 | 31.3 |
Example Diagram
