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For boaters who require a “domestic-style” heating experience, a hydronic diesel system is the premier choice for on-board climate control. These units, often referred to as “wet heaters,” circulate a heated water-glycol mixture through a circuit of radiators or matrix heaters, while simultaneously providing a consistent supply of domestic hot water via a calorifier. This method of marine climate control is exceptionally quiet and offers superior heat retention compared to air-based systems, making it ideal for larger vessels and year-round live-aboards.

The Specialist Difference: Hydronic System Engineering

Designing a water-based heating circuit requires a high level of technical precision to ensure the system operates without “cycling” or overheating. Our engineering approach focuses on hydraulic balancing and component longevity.

• Radiator Circuit Balancing: We calculate the specific heat output required for each cabin to ensure the boiler runs at its most efficient temperature.
• Calorifier Integration: We expertly integrate the heater with your boat’s domestic water system, ensuring you have hot water for showers and galleys without needing to run the main engine.
• Expansion & Safety: Professional installations include correctly sized expansion tanks and over-pressure valves to protect the integrity of your plumbing under varying thermal loads.

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Premium Diesel Water Heater Brands

We provide professional installation and commissioning for the industry’s most reliable hydronic manufacturers:

Our Diesel Water Heaters

See all our diesel water heaters in no particular order below. This is a collection of compatible models across our range; for more detailed listings and technical specifications, please follow the main menu to our manufacturer-specific pages.

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Safety/Regulatory: OFTEC and Canal & River Trust (CRT)

To ensure your vessel remains compliant with Canal & River Trust (CRT) licensing, all diesel water heaters must be installed according to Boat Safety Scheme (BSS) mandates. This includes specific requirements for the installation of ISO 7840-compliant fuel hoses, fire-protected copper fuel lines, and correctly routed wet exhausts.

As OFTEC registered technicians, we ensure that every hydronic system meets the relevant standards. Our commissioning process includes a full analysis to verify that the heater is burning cleanly, preventing carbon buildup and protecting your manufacturer’s warranty.

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