Water Heaters / Calorifiers

Boat water heaters or calorifiers (as they are also known), provide hot water on board. They work as heater exchangers, deriving their heat source from the boat’s engine cooling system. All our calorifiers are fitted with 230v electric immersions heaters allowing you to continue to have hot water when the engine is off and you have a source of either shore power or battery power via an inverter.

Isotemp / Isotherm part of the Domestic Group, make this quality range of stainless steel, marine grade water heaters. All Isotemp water heaters feature a thermo mixing valve which protects against scalding water and helps maintain hot water efficiency and conservation. There are four models of calorifiers in this range - Isotemp SPA, Basic, Basic Slim and Slim Square all of high quality and well worth the investment. The salt water environment coupled with water and heat can be extremely corrosive. Failures and breakdowns can be costly and highly inconvenient when on a cruise, so we do recommend Isotemp as the best water heater or caloriifer range on the market.

Quick Iwater heaters are premium marine-grade systems from Italy designed to deliver reliable hot water onboard with efficiency and style. Manufactured in Italy, they combine compact design, corrosion-resistant materials, and high-performance heating elements to withstand harsh marine environments. Ideal for yachts and boats, Quick water heaters ensure consistent hot water supply while optimizing space and energy use at sea.