What sizes does the Kuuma marine water heater line come in?

Kuuma offers this water heater in a 5 gallon capacity (model 11800) and an 11 gallon capacity (model 11840), both in a 120V side-mount, front heat exchange configuration.

How do I choose between the 5 gallon and 11 gallon model?

Choose the 5 gallon 11800 if you have a smaller boat or limited installation space, and the 11 gallon 11840 if you have room to spare and want a larger reserve of hot water for showers, galley use, or more people aboard.

Is this a side mount or front mount water heater?

Both models are side mount units with a front heat exchanger, meaning the plumbing and heating components are accessed from the front of the tank while the mounting orientation is side-to-side.

What voltage and wattage do these water heaters use?

Both the 11800 and 11840 run on 120V at 60Hz and draw 1500W through an L1 & N wiring configuration, making them suitable for shore power or generator-sourced AC power.

Do these water heaters use engine heat to warm water?

No, both models are AC-only units that heat water using their 1500W electric element; neither has a heat exchanger loop for engine coolant.

What is the tank and case made of?

Both models feature a marine-grade aluminum alloy case and a TIG-welded aluminum tank, built to withstand the marine environment.

Are these water heaters certified for marine use?

Yes, both the 11800 and 11840 are UL listed to UL174 and include a T&P valve rated at 150 psi and 210 degrees F, CSA certified.

What is the difference between model 11800 and 11840?

The primary difference is tank capacity: the 11800 holds 5 gallons while the 11840 holds 11 gallons. Both share the same side-mount, front heat exchange design, 120V/1500W electrical input, and construction materials.

Kuuma Marine Water Heaters - 5 to 11 Gallon 120V

Kuuma Marine Water Heaters - Side Mount, Front Heat Exchange, Available in 5 Gallon to 11 Gallon

$662.44

Kuuma marine water heaters deliver reliable, consistent hot water aboard your boat with a compact side-mount design built for tight installation spaces. Constructed with a marine-grade aluminum alloy case and TIG-welded aluminum tank, these AC-powered units run on 120V shore or generator power and place the heat exchanger up front for straightforward plumbing access. Whether you need a smaller 5 gallon tank for a compact cruiser or a larger 11 gallon capacity for extended time aboard, the Kuuma lineup is UL listed and engineered to hold up in the marine environment.

Specifications

Brand: Kuuma
Mount Alignment: Side-Side
Heat Exchanger Position: Front
Electrical Input: 120V - 60Hz/1500W
Wiring Configuration: L1 & N
T&P Valve Type: 150 psi & 210 degrees F, CSA
Case Material: Marine-grade aluminum alloy
Tank Material: Aluminum
Certification: UL listed to UL174
Construction: TIG welded

Sizes & Options

This line is available in two tank capacities: the 5 Gallon 120V (model 11800), a compact option suited to smaller boats or limited installation space, and the 11 Gallon 120V (model 11840), sized for boats needing a larger reserve of hot water for showers, galley use, or multiple crew. Both share the same side-mount configuration, front heat exchanger placement, and 120V/1500W electrical input, so choose based on the physical space available and your onboard hot water demand.

Kuuma Marine Water Heaters - Side Mount, Front Heat Exchange, Available in 5 Gallon to 11 Gallon

Specifications

Sizes & Options

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