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.
So which model water heater should I choose?
SPA
This is our first choice for sizes up to 40L. Most economical with all the performance of the other models.
BASIC
Choose this for sizes above 40L, for spaces with more width and less length and for when you prefer a satin, stainless steel outer finish.
BASIC Slim
SQUARE Slim
Choose this for special locations and narrower spaces.
BASIC Twin
Use for either double heat source (i.e. twin engines) or double heat output (i.e. radiators & hot water).
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Isotemp Water Heater - Slim 25L with Thermo Mixing Valve
Isotemp
Current Stock: 4€720.00The Isotemp Slim 25l Water Heater comes with a brushed stainless steel cover, a stainless steel tank all combined in an innovative internal design. It achieves the highest capacity and efficiency by optimized installation of the engine water...44047€720.00 -
Isotemp Water Heater - Slim 20L with Thermo Mixing Valve
Isotemp
Current Stock: 0€665.00The Isotemp Slim 20l Water Heater comes with brushed stainless steel cover, stainless steel tank all combined in an innovative internal design. It achieves the highest capacity by optimized installation of the engine water heat exchanger, as...44046€665.00 -
Isotemp Water Heater - Slim 15L with Thermo Mixing Valve
Isotemp
Current Stock: 9€670.00The Isotemp Slim 15 l Water Heater comes with brushed steel cover, high quality stainless steel tank as well as innovative internal design. It achieves the highest capacity by optimized installation of the engine water heat exchanger as...44045€670.00 -
Isotemp Water Heater - Square Slim 16L with Thermo Mixing Valve
Isotemp
Current Stock: 5Now €699.00Was €850.00The Isotemp Slim Square can be installed in three different positions, making it more versatile than standard models. It has a 16ltr capacity, quickly and effectively heats water up via the engine or by the electrical heater elemen, 230v x 750w t if the...44055Now €699.00Was €850.00 -
Isotemp SPA Stainless Steel Water Heater - 40L with Thermo Mixing Valve
Isotemp
Current Stock:€725.00 - €805.00Isotemp SPA Stainless Steel Marine Water Heaters or Calorifiers are they are often know are specifically designed for use in the demanding marine environment. The new Isotemp SPA line features a more economical polypropylene cover and a...€725.00 - €805.00 -
Isotemp SPA Stainless Steel Water Heater - 30L Thermo with Mixing Valve
Isotemp
Current Stock: 5€690.00Isotemp SPA Stainless Steel Marine Water Heaters or Calorifiers as they are sometime known are specifically designed for use in the demanding marine environment. The new Isotemp SPA line features a more economical polypropylene cover and...44066€690.00 -
Isotemp SPA Stainless Steel Water Heater - 25L with Thermo Mixing Valve
Isotemp
Current Stock: 2€690.00Isotemp SPA Stainless Steel Marine Water Heaters or Calorifiers as they are sometime known are specifically designed for use in the demanding marine environment. The new Isotemp SPA line features a more economical polypropylene cover and...44064€690.00 -
Isotemp SPA Stainless Steel Water Heater - 20L with Thermo Mixing Valve
Isotemp
Current Stock: 1€660.00Isotemp SPA Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. The new Isotemp SPA line features a more economical polypropylene cover and a 316-grade stainless steel inner...44062€660.00 -
Isotemp SPA Stainless Steel Water Heater - 15L with Thermo Mixing Valve
Isotemp
Current Stock: 2€630.00Isotemp SPA Stainless Steel Marine Water Heaters are specifically designed for use in the demanding marine environment. The new Isotemp SPA line features a more economical polypropylene cover and a 316-grade stainless steel inner...44060€630.00 -
Isotemp Water Heater - Basic 24L with Thermo Mixing Valve
Isotemp
Current Stock: 3€710.00Isotemp Basic Water Heaters are specifically designed for the use on yachts and boats. the Basic range is based on more compact and shorter designs Only high quality components are chosen to ensure the best product performance. These marine water heaters...44034€710.00 -
Isotemp Water Heater - Basic 30L with Thermo Mixing Valve
Isotemp
Current Stock: 4€775.00Isotemp Basic Water Heaters are specifically designed for the use on yachts and boats. The Basic range is based on more compact and shorter designs. Only high quality components are chosen to ensure the best product performance. These marine water...44034/1€775.00 -
Isotemp Water Heater - Basic 40L with Thermo Mixing Valve
Isotemp
Current Stock: 2€790.00Isotemp Basic Water Heaters are specifically designed for the use on yachts and boats. the Basic range is based on more compact and shorter designs Only high quality components are chosen to ensure the best product performance. These marine water heaters...44035€790.00 -
Isotemp Water Heater - Basic TWIN 40L with Double Coil & Mixer
Isotemp
Current Stock: 2€1,005.00Isotemp Basic Water Heaters or Calorifiers as they are often known are specifically designed for the use maerine use . This model, the Basic TWIN, features a double heat exchanger coil. Only high quality components are chosen to ensure the best product...44030€1,005.00 -
Isotemp Water Heater - Basic 50L with Thermo Mixing Valve
Isotemp
Current Stock: 2€1,040.00Isotemp Basic Water Heaters are specifically designed for the use on yachts and boats. the Basic range is based on more compact and shorter designs Only high quality components are chosen to ensure the best product performance. These marine water heaters...44036€1,040.00 -
Isotemp Water Heater - Basic 75L with Thermo Mixing Valve
Isotemp
Current Stock: 1€1,580.00Isotemp Basic Water Heaters are specifically designed for the use on yachts and boats. the Basic range is based on more compact and shorter designs Only high quality components are chosen to ensure the best product performance. These marine water heaters...44037€1,580.00 -
Isotemp Water Heater - Basic TWIN 75L with Double Coil & Mixer
Isotemp
Current Stock: 1€1,550.00Isotemp Basic Water Heaters or Calorifiers as they are often known are specifically designed for the use maerine use . This model, the Basic TWIN, features a double heat exchanger coil. Only high quality components are chosen to ensure the best product...44031€1,550.00