Kuuma 11810 Marine Water Heater — 6 Gal, 120V AC, Side-Mount, Front Heat Exchanger (735-11810)
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The Mid-Size Sweet Spot — 6 Gallons, Shore Power or Engine Heat
The Kuuma 11810 (735-11810) fills the gap between the compact 5-gallon 11800 and the full-size 11-gallon models — making it the right call for couples and small crews who want more capacity without the bulk. The side-mount configuration keeps installation flexible in tight engine rooms, and the front-mounted heat exchanger ties into your engine’s coolant loop so hot water builds underway without drawing on shore power.
Key Features
- 6-Gallon Capacity — ideal for couples and small crews; more reserve than a 5-gallon without the footprint of an 11-gallon
- 120V AC / 1500W Element — shore power compatible; lower draw than 1800W units, suitable for 15A shore power circuits
- Side-Mount Configuration — flexible installation orientation for engine rooms and lockers where front or vertical access is limited
- Front-Mounted Heat Exchanger — engine coolant loop integration for underway hot water; front placement suits forward engine room plumbing access
- Aluminum Tank & Aluminum Alloy Case — reduces galvanic corrosion risk; lightweight at 9.1 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 735-11810 is the 6-gallon mid-size in the Kuuma side-mount water heater line, sourced through Land 'N' Sea. Position this between the 11800 (5 gal, 735-11800) and the 11841/11842 (11 gal) when advising customers on capacity — it’s a strong recommendation for two-person cruisers where the 5-gallon runs short on passage but the 11-gallon is overkill. At 9.1 kg it’s a manageable single-person install in most configurations. Same engine coolant-only restriction applies to the heat exchanger — 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.