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Marine Water Heaters

If you’ve been considering replacing the marine hot water heater on your boat – you’ve come to the right place! Fisheries Supply offers a full range of boat hot water heaters in a variety of sizes at competitive prices from trusted brands like Torrid, Raritan, Isotherm, Seaward Products, Quick and Kuuma. We also stock pressure relief valves, anodes and other accessories to keep your marine water heater running in top condition for the long term – so shop today and save!

Show In-Stock Only
In-Stock

Hose for these Water Heaters

Kuuma Products

Kuuma Water Heaters

Available in 7 options

In Stock
|
Ships immediately
Hose for these Water Heaters

Kuuma Products

Water Heater Hose

SKU: 173556 | Item ID: KUM 15009

Special Order Only
11916 of Kuuma Products Water Heater Anode

Kuuma Products

Water Heater Anode

SKU: 1008416 | Item ID: KUM 11916

In Stock
|
Ships immediately
11930 of Kuuma Products Water Heater Thermostat

Kuuma Products

Water Heater Thermostat

SKU: 207318 | Item ID: KUM 11930

In Stock
|
Ships immediately
Seaward Water Heaters

Whale

Water Heater 6/11/20 Gal - Front Heat Exchanger - Stainless - Horizontal

Available in 3 options

In Stock
|
Ships immediately
20 GAL WATER HEATER FRNT H/E 120V GALV

Whale

Water Heater 20 Gal. - Front Heat Exchanger - Galvanised - Vertical

SKU: 50125 | Item ID: S/W S1800

In Stock
|
Ships immediately

Whale

Water Heater 20 Gal. - Front Heat Exchanger - Stainless - Vertical

SKU: 50126 | Item ID: S/W S1900

Should ship in 1 - 2 days

Whale

Water Heater 6/11/20 Gal. - Front Heat Exchanger - Galvanised - Horizontal

Available in 3 options

In Stock
|
Ships immediately

Whale

Water Heater 6/11/20 Gal - Rear Heat Exchanger - Stainless

Available in 3 options

In Stock
|
Ships immediately

Whale

Water Heater 6/11 Gal - Rear Heat Exchanger - Galvanised

Available in 2 options

In Stock
|
Ships immediately

Whale

Water Heater 3 Gal. - 12V Electric Only

SKU: 442118 | Item ID: S/W S360EW

In Stock
|
Ships immediately

Whale

Pressure Temperature Relief Valve for Seaward Water Heaters

SKU: 98259 | Item ID: S/W 75974

In Stock
|
Ships immediately

Isotherm

Isotemp Slim Square Water Heater

SKU: 180778 | Item ID: ISO 601623QX00003

Out of Stock
|
Should ship in 7 - 14 days

Isotherm

Isotemp Spa Water Heaters

Available in 4 options

Should ship in 1 - 2 days

Isotherm

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

SKU: 434652 | Item ID: ISO 6P4023SPA0003

Out of Stock

Isotherm

Isotherm Basic Electric & Engine Water Heaters

Available in 7 options

In Stock
|
Ships immediately

Isotherm

Isotherm Slim Electric & Engine Water Heaters

Available in 4 options

In Stock
|
Ships immediately

Isotherm

Mixing Valve for Regular, Basic and Slim Water Heaters

SKU: 388407 | Item ID: ISO SFD00011AA

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

Out of Stock
|
Should ship in 5 - 7 days

Isotherm

Zinc for SP Systems

SKU: 177091 | Item ID: ISO SBE00006AA

Out of Stock

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

In Stock
|
Ships immediately

Isotherm

Water Heater Mixing Valve

SKU: 215269 | Item ID: ISO SFD000011AA

In Stock
|
Ships immediately

Vetus

Water Heater - Double Walled

Available in 5 options

Special Order Only

Torrid

MVS 6 IX Marine Vertical Water Heater - 6 Gallons

Available in 3 options

Should ship in 1 - 2 days

Torrid

MVS 10 IX Marine Vertical Water Heater - 10 Gallons

Available in 3 options

Out of Stock
|
Should ship in 5 - 7 days

Torrid

MVW 10 IX Marine Vertical Water Heater - 10 Gallons

SKU: 1011983 | Item ID: TOR MVW10IX120/1500

Out of Stock
|
Should ship in 5 - 7 days

Torrid

MVS 15 IX Marine Vertical Water Heater - 15 Gallons

Available in 3 options

Out of Stock
|
Should ship in 5 - 7 days

Torrid

MVS 17 IX Marine Vertical Water Heater - 17 Gallons

Available in 3 options

Out of Stock
|
Should ship in 5 - 7 days

Torrid

MVS 20 IX Marine Vertical Water Heater - 20 Gallons

Available in 3 options

Out of Stock
|
Should ship in 5 - 7 days

Torrid

MVW 20 IX Marine Vertical Water Heater - 20 Gallons

Available in 3 options

Out of Stock
|
Should ship in 5 - 7 days

Torrid

MVS 30 IX Marine Vertical Water Heater - 30 Gallons

Available in 3 options

Out of Stock
|
Should ship in 5 - 7 days

Torrid

MVW 30 IX Marine Vertical Water Heater - 30 Gallons

Available in 3 options

Out of Stock
|
Should ship in 5 - 7 days

Torrid

MVS 40 IX Marine Vertical Water Heater - 40 Gallons

Available in 3 options

Out of Stock
|
Should ship in 5 - 7 days

Torrid

MVS 40 2IX 2EL Explorer Series Marine Water Heater, Vertical - 40 Gallons

SKU: 1018786 | Item ID: TOR MVS402IX2EL240/1500_240/3000

Special Order Only

Torrid

MVW 40 IX Marine Vertical Water Heater - 40 Gallons

Available in 3 options

Out of Stock
|
Should ship in 5 - 7 days

Torrid

MVS 50 2IX 2EL Explorer Series Marine Water Heater, Vertical - 50 Gallons

SKU: 1018787 | Item ID: TOR MVS502IX2EL240/1500_240/4000

Special Order Only

Torrid

MHS 6 IX Marine Horizontal Water Heater - 6 Gallons

SKU: 1011005 | Item ID: TOR MHS6IX120/1500

Out of Stock
|
Should ship in 5 - 7 days

Torrid

MHS 10 IX Marine Horizontal Water Heater - 10 Gallon

SKU: 1011008 | Item ID: TOR MHS10IX120/1500

Out of Stock
|
Should ship in 5 - 7 days

Torrid

5 Year Marine Water Heater Maintenance Kit - for Models 30 Gallons and Less

Available in 3 options

In Stock
|
Ships immediately

Torrid

Tank Booster Pro - Mixing Valve Kit

SKU: 201502 | Item ID: TOR TMV90-160

In Stock
|
Ships immediately

Torrid

Thermostat for Water Heaters

SKU: 387326 | Item ID: TOR TC

Out of Stock

Torrid

T & P Relief Valve

SKU: 1010985 | Item ID: TOR TP100-210XL

In Stock
|
Ships immediately
Hose for these Water Heaters

Kuuma Products

Kuuma Water Heaters

Available in 7 options

Shop Now
Hose for these Water Heaters

Kuuma Products

Water Heater Hose

SKU: 173556 | Item ID: KUM 15009

Shop Now

Kuuma Products

Water Heater Anode

SKU: 1008416 | Item ID: KUM 11916

Shop Now

Kuuma Products

Water Heater Thermostat

SKU: 207318 | Item ID: KUM 11930

Shop Now

Whale

Water Heater 6/11/20 Gal - Front Heat Exchanger - Stainless - Horizontal

Available in 3 options

Shop Now

Whale

Water Heater 20 Gal. - Front Heat Exchanger - Galvanised - Vertical

SKU: 50125 | Item ID: S/W S1800

Shop Now

Whale

Water Heater 20 Gal. - Front Heat Exchanger - Stainless - Vertical

SKU: 50126 | Item ID: S/W S1900

Shop Now

Whale

Water Heater 6/11/20 Gal. - Front Heat Exchanger - Galvanised - Horizontal

Available in 3 options

Shop Now

Whale

Water Heater 6/11/20 Gal - Rear Heat Exchanger - Stainless

Available in 3 options

Shop Now

Whale

Water Heater 6/11 Gal - Rear Heat Exchanger - Galvanised

Available in 2 options

Shop Now

Whale

Water Heater 3 Gal. - 12V Electric Only

SKU: 442118 | Item ID: S/W S360EW

Shop Now

Whale

Pressure Temperature Relief Valve for Seaward Water Heaters

SKU: 98259 | Item ID: S/W 75974

Shop Now

Isotherm

Isotemp Slim Square Water Heater

SKU: 180778 | Item ID: ISO 601623QX00003

Shop Now

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

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

Isotherm

Water Heater Mixing Valve

SKU: 215269 | Item ID: ISO SFD000011AA

Shop Now

Vetus

Water Heater - Double Walled

Available in 5 options

Shop Now

Torrid

MVS 6 IX Marine Vertical Water Heater - 6 Gallons

Available in 3 options

Shop Now

Torrid

MVS 10 IX Marine Vertical Water Heater - 10 Gallons

Available in 3 options

Shop Now

Torrid

MVW 10 IX Marine Vertical Water Heater - 10 Gallons

SKU: 1011983 | Item ID: TOR MVW10IX120/1500

Shop Now

Torrid

MVS 15 IX Marine Vertical Water Heater - 15 Gallons

Available in 3 options

Shop Now

Torrid

MVS 17 IX Marine Vertical Water Heater - 17 Gallons

Available in 3 options

Shop Now

Torrid

MVS 20 IX Marine Vertical Water Heater - 20 Gallons

Available in 3 options

Shop Now

Torrid

MVW 20 IX Marine Vertical Water Heater - 20 Gallons

Available in 3 options

Shop Now

Torrid

MVS 30 IX Marine Vertical Water Heater - 30 Gallons

Available in 3 options

Shop Now

Torrid

MVW 30 IX Marine Vertical Water Heater - 30 Gallons

Available in 3 options

Shop Now

Torrid

MVS 40 IX Marine Vertical Water Heater - 40 Gallons

Available in 3 options

Shop Now

Torrid

MVS 40 2IX 2EL Explorer Series Marine Water Heater, Vertical - 40 Gallons

SKU: 1018786 | Item ID: TOR MVS402IX2EL240/1500_240/3000

Shop Now

Torrid

MVW 40 IX Marine Vertical Water Heater - 40 Gallons

Available in 3 options

Shop Now

Torrid

MVS 50 2IX 2EL Explorer Series Marine Water Heater, Vertical - 50 Gallons

SKU: 1018787 | Item ID: TOR MVS502IX2EL240/1500_240/4000

Shop Now

Torrid

MHS 6 IX Marine Horizontal Water Heater - 6 Gallons

SKU: 1011005 | Item ID: TOR MHS6IX120/1500

Shop Now

Torrid

MHS 10 IX Marine Horizontal Water Heater - 10 Gallon

SKU: 1011008 | Item ID: TOR MHS10IX120/1500

Shop Now

Torrid

5 Year Marine Water Heater Maintenance Kit - for Models 30 Gallons and Less

Available in 3 options

Shop Now

Torrid

Tank Booster Pro - Mixing Valve Kit

SKU: 201502 | Item ID: TOR TMV90-160

Shop Now

Torrid

Thermostat for Water Heaters

SKU: 387326 | Item ID: TOR TC

Shop Now

Torrid

T & P Relief Valve

SKU: 1010985 | Item ID: TOR TP100-210XL

Shop Now
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