Kuuma 11842 Marine Water Heater — 11 Gal, 120V AC, Rear Heat Exchanger (735-11842)
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Dual-Source Hot Water — Shore Power at the Dock, Engine Heat Underway
The Kuuma 11842 (735-11842) delivers the same proven 11-gallon, 120V AC performance as the Kuuma 11841 — with one key difference: a rear-mounted heat exchanger for engine rooms where rear plumbing access is more practical. Shore power heats the tank at the dock; the engine coolant loop takes over underway, so you arrive at anchorage with hot water already waiting.
Key Features
- 11-Gallon Capacity — suitable for larger vessels, liveaboards, and extended cruising
- 120V AC / 1500W Element — shore power compatible; lower draw than 1800W units, easier on 15A shore power circuits
- Rear-Mounted Heat Exchanger — engine coolant loop integration for underway hot water production; rear placement suits engine rooms with rear plumbing access
- Aluminum Tank & Aluminum Alloy Case — reduces galvanic corrosion risk; lightweight construction
- 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 735-11842 is the rear-exchanger variant of the Kuuma 11841 (735-11841), sourced through Land 'N' Sea. The only functional difference between the two is exchanger position — front (11841) vs. rear (11842). At 14.1 kg the 11842 is heavier than the 11841 (11.8 kg); confirm whether the weight difference is due to the exchanger configuration or a manufacturing variance. The engine coolant-only restriction applies equally to both models — flag prominently for customers with raw-water-cooled engines. For customers deciding between Kuuma and Seaward rear-exchanger units, compare against the Seaward S1100 (698-S1100): Kuuma is 1500W vs. Seaward’s 1800W, and aluminum alloy vs. galvanized steel case. No image currently on file — flag for photo or manufacturer asset request.
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.