Kuuma 11840 Marine Water Heater — 11 Gal, 120V AC, Side-Mount, Front Heat Exchanger (735-11840)
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
11-Gallon Capacity, Side-Mount Flexibility — Shore Power or Engine Heat
The Kuuma 11840 (735-11840) brings full 11-gallon hot water capacity to vessels where a side-mount installation is the practical choice. The side-mount configuration opens up installation options in engine rooms and lockers where front-face access is constrained, while the front-mounted heat exchanger ties into your engine’s coolant loop for efficient hot water production underway. Arrive at anchorage with a full tank — no shore power required.
Key Features
- 11-Gallon Capacity — handles the hot water demands of larger crews, liveaboards, and extended passages
- 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 lateral clearance is the constraint
- 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 11.8 kg for an 11-gallon unit
- 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 735-11840 is the side-mount variant of the 11-gallon Kuuma front-exchanger line. The only differentiator from the 11841 (735-11841, front-mount/front exchanger) is mounting orientation — side-mount suits installations where lateral clearance is available but front-face access is limited. At 11.8 kg, weight is identical to the 11841; both are manageable two-person installs.
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.