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Isotherm Marine Water Heaters & Parts

Hot water onboard is an important part of comfortable cruising, which is why Fisheries Supply is proud to offer Isotherm water heaters. Isotherm hot water heaters are specifically designed for use in the challenging marine environment so are manufactured robustly – with stainless steel inner tanks and either stainless or high-quality polypropylene outer casings that are made to last. Isotherm marine water heaters come in a variety of sizes to fit any boat and include an engine heat exchanger for additional heating options. Shop now and save, or to see our complete offering of Isotherm products, click here.

Show In-Stock Only
In-Stock

Isotemp Slim Square Water Heater

Isotherm

Isotemp Slim Square Water Heater

SKU: 180778 | Item ID: ISO 601623QX00003

Out of Stock
Isotemp Spa Water Heaters

Isotherm

Isotemp Spa Water Heaters

Available in 4 options

Out of Stock
Isotherm SPA Water Heater 11 Gallon/40 Liter with Safety Mixing Valve

Isotherm

SPA Water Heater 11 Gallon/40 Liter with Safety Mixing Valve

SKU: 434652 | Item ID: ISO 6P4023SPA0003

Out of Stock
Basic Electric/Engine Water Heaters

Isotherm

Isotherm Basic Electric & Engine Water Heaters

Available in 7 options

In Stock
|
Ships immediately
Isotherm Electric/Engine Water Heaters

Isotherm

Isotherm Slim Electric & Engine Water Heaters

Available in 4 options

In Stock
|
Ships immediately
Mixing Valve for Regular, Basic and Slim Water Heaters

Isotherm

Mixing Valve for Regular, Basic and Slim Water Heaters

SKU: 388407 | Item ID: ISO SFD00011AA

In Stock
|
Ships immediately

Isotherm

Water Heater Mixing Valve

SKU: 215269 | Item ID: ISO SFD000011AA

In Stock
|
Ships immediately

Isotherm

Safety Valve

SKU: 184649 | Item ID: ISO SFD00023AA

In Stock
|
Ships immediately

Isotherm

110V/750W Heating Element

SKU: 197811 | Item ID: ISO SEE00014HA

In Stock
|
Ships immediately

Isotherm

BSP to NPT Adapter

SKU: 1018328 | Item ID: ISO SFB00002AA

In Stock
|
Ships immediately

Isotherm

Zinc for SP Systems

SKU: 177091 | Item ID: ISO SBE00006AA

Out of Stock
|
Should ship in 6 - 9 days

Isotherm

Braided Steel Hose

SKU: 1022506 | Item ID: ISO SFE00021AA

In Stock
|
Ships immediately

Isotherm

Gasket Set for Basic & Slim Water Heaters

SKU: 207738 | Item ID: ISO SDF00025AA

Out of Stock
Isotemp Slim Square Water Heater

Isotherm

Isotemp Slim Square Water Heater

SKU: 180778 | Item ID: ISO 601623QX00003

Shop Now
Isotemp Spa Water Heaters

Isotherm

Isotemp Spa Water Heaters

Available in 4 options

Shop Now

Isotherm

SPA Water Heater 11 Gallon/40 Liter with Safety Mixing Valve

SKU: 434652 | Item ID: ISO 6P4023SPA0003

Shop Now

Isotherm

Isotherm Basic Electric & Engine Water Heaters

Available in 7 options

Shop Now

Isotherm

Isotherm Slim Electric & Engine Water Heaters

Available in 4 options

Shop Now

Isotherm

Mixing Valve for Regular, Basic and Slim Water Heaters

SKU: 388407 | Item ID: ISO SFD00011AA

Shop Now

Isotherm

Water Heater Mixing Valve

SKU: 215269 | Item ID: ISO SFD000011AA

Shop Now

Isotherm

Safety Valve

SKU: 184649 | Item ID: ISO SFD00023AA

Shop Now

Isotherm

110V/750W Heating Element

SKU: 197811 | Item ID: ISO SEE00014HA

Shop Now

Isotherm

BSP to NPT Adapter

SKU: 1018328 | Item ID: ISO SFB00002AA

Shop Now

Isotherm

Zinc for SP Systems

SKU: 177091 | Item ID: ISO SBE00006AA

Shop Now

Isotherm

Braided Steel Hose

SKU: 1022506 | Item ID: ISO SFE00021AA

Shop Now

Isotherm

Gasket Set for Basic & Slim Water Heaters

SKU: 207738 | Item ID: ISO SDF00025AA

Shop Now
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