Kuuma 11812 Marine Water Heater — 6 Gal, 120V AC, Front-Mount, Rear Heat Exchanger (735-11812)
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
6-Gallon Hot Water with Rear Exchanger Access — Shore Power or Engine Heat
The Kuuma 11812 (735-11812) rounds out the 6-gallon Kuuma front-mount line with a rear-mounted heat exchanger — the right choice when your engine room plumbing runs to the rear of the tank and a front exchanger connection isn’t practical. Same proven 6-gallon capacity, 1500W element, and aluminum alloy construction as the 11811, with the exchanger repositioned to suit your installation layout.
Key Features
- 6-Gallon Capacity — well-suited for couples and small crews; solid hot water reserve for daily use
- 120V AC / 1500W Element — shore power compatible; lower draw than 1800W units, suitable for 15A shore power circuits
- Front-Mount Configuration — front-face access for connections, inspection, and servicing
- Rear-Mounted Heat Exchanger — engine coolant loop integration for underway hot water; rear placement suits engine rooms where rear plumbing access is more practical
- 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 735-11812 completes the 6-gallon Kuuma front-mount trio alongside the 11811 (735-11811, front exchanger) and 11810 (735-11810, side-mount/front exchanger). The only difference from the 11811 is exchanger position — rear vs. front. When advising customers: if their engine room plumbing exits from the rear of the tank location, the 11812 is the correct pick; if from the front, the 11811. Unit cost is nearly identical to the 11811 ($567.06 vs. $554.12) — no meaningful price reason to choose one over the other; installation layout is the deciding factor. Engine coolant-only restriction applies equally. Weight is recorded as 0g — missing data, obtain from Kuuma spec sheet and update (expect ~8.8–9.1 kg based on sibling units). 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.