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Surejust Water Heaters



SureCal calorifiers/boilers are made of the finest quality materials, which guaranteeing the ultimate performance and reliability.

The Surecal calorifiers use your engine's cooling system to provide hot water in your camper van conversion. Electric immersion elements can also be added where necessary.

Surejust have been prominent in the marine industry for 25 years and have developed a range of calorifiers, of the highest standard used by boat builders around the world, they are now also by many of the major motorhome manufacturers.



The units are quick and easy to install with full fitting instructions provided. Each boiler is insulated in a polyurethane jacket which will retain the heat for up to 24 hours after the engine has been switched off. The boilers are made of 100% copper, this gives both performance and health benefits.

SureCal calorifiers come completely assembled ready for quick and easy installation. The pressure release valve, barbed engine coil connections and stainless steel fixing brackets all come as standard. A thermostatic mixer valve is fitted as standard for the safety of those onboard and increases the volume of hot water available.

The stored water within the boiler reaches the same temperature as the engine (generally 85°C). If the mixer valve is set at 65°C you will generally increase your available hot water supply by 25%. 

Every calorifer is also individiually bench tested ensuring quality and reliability every time. In house development and a commitment to customer service, quality and reliability allow us to provide boat builders with the exact shape and size of boiler to suit their space and application.


We offer a selection of their clarifiers and associated components, which we think best suit most builds, but please ask if you need a larger unit.