Kuuma 11811 Marine Water Heater — 6 Gal, 120V AC, Front-Mount, Front Heat Exchanger (735-11811)
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You have 30 days to request a return. All sale items are final sale.
6-Gallon Hot Water, Front-Mount Flexibility — Shore Power or Engine Heat
The Kuuma 11811 (735-11811) is a 6-gallon marine water heater built for vessels where front-access installation is the practical choice. Identical in capacity and output to the side-mount 11810, the 11811’s front-mount configuration suits engine rooms and lockers where the tank face needs to be accessible from the front — making connections, inspection, and servicing straightforward. The front-mounted heat exchanger ties into your engine’s coolant loop for hot water production underway, so you’re not relying on shore power once you cast off.
Key Features
- 6-Gallon Capacity — well-suited for couples and small crews; solid reserve for daily use without the bulk of an 11-gallon unit
- 120V AC / 1500W Element — shore power compatible; lower draw than 1800W units, suitable for 15A shore power circuits
- Front-Mount Configuration — designed for installations where front-face access is required; easier servicing vs. side-mount in confined spaces
- Front-Mounted Heat Exchanger — engine coolant loop integration for underway hot water production
- Aluminum Tank & Aluminum Alloy Case — reduces galvanic corrosion risk; lightweight at 8.8 kg
- 1/2" NPT Hot/Cold Connections — standard fitting size for straightforward plumbing integration
- UL/CE Certified, Ignition Protected — approved for gasoline-engine vessels; dual certification for US and European markets
⚠️ Important: Heat exchanger is designed for use with engine coolant only. Do not connect to raw water systems.
Parts Desk Insights
SKU 735-11811 is the front-mount variant of the 6-gallon Kuuma line, sourced through Land 'N' Sea. The sole differentiator from the 11810 (735-11810, side-mount) is mounting orientation — specs, capacity, and output are identical. At 8.8 kg it is marginally lighter than the 11810 (9.1 kg); confirm whether this is a spec variance or a measurement discrepancy. When advising customers between the two: front-mount suits installations where the tank face must be accessible; side-mount suits installations where lateral clearance is the constraint. Engine coolant-only restriction on the heat exchanger applies — flag for raw-water-cooled engine vessels. No image on file — obtain from Kuuma spec sheet or manufacturer asset library.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.