Whale Water Heaters - White 3-GAL Water Heater 120V | S300W
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
3-Gallon Electric and Heat-Exchanger Water Heater
The Whale S300W is a horizontal marine water heater with a 3-US-gallon tank and a white epoxy exterior. It heats fresh water using its 120 V AC element or a connected engine-coolant circuit through the side heat exchanger.
Key Features
- Capacity: 3 US gallons, approximately 11 litres.
- Electrical rating: 120 V AC, 1,250 W.
- Side-mounted heat exchanger for engine-assisted water heating.
- Horizontal installation with white epoxy exterior.
View Whale electrical specifications · View S300W model specifications
Installation Notes
Have a qualified electrician install the electrical circuit in accordance with Whale's instructions. The S300W requires a 15 A circuit breaker. Confirm the side heat-exchanger connections and service access, and fill the tank before energizing the element.
Parts Desk Insight
The S300W uses a 1,250 W element. Match the complete heater model when ordering an element or planning the electrical circuit.
- Brand: Whale
- Manufacturer part #: S300W
- Sold as: EA
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.