---
product_id: 26486459
title: "Whale Marine S300W 3 Gallon Hot Water Heater W/Side Heat Exchanger - White Epoxy - 120v - 1500w"
brand: "whale seaward"
price: "€ 1944.97"
currency: EUR
in_stock: true
url: https://www.desertcart.hr/products/26486459-whale-marine-s300w-3-gallon-hot-water-heater-w-side
store_origin: HR
region: Croatia
---

# 1500W electric power 3-gallon marine-grade tank Thermostat set to 140°F Whale Marine S300W 3 Gallon Hot Water Heater W/Side Heat Exchanger - White Epoxy - 120v - 1500w

**Brand:** whale seaward
**Price:** € 1944.97
**Availability:** ✅ In Stock

## Summary

> 🌊 Hot water, cool boat vibes — stay warm, stay ahead!

## Quick Answers

- **What is this?** Whale Marine S300W 3 Gallon Hot Water Heater W/Side Heat Exchanger - White Epoxy - 120v - 1500w by whale seaward
- **How much does it cost?** € 1944.97 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/26486459-whale-marine-s300w-3-gallon-hot-water-heater-w-side)

## Best For

- whale seaward enthusiasts

## Why This Product

- Trusted whale seaward brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First Design:** Equipped with a temperature pressure relief valve and large 3/4" drain valve for reliable, worry-free operation.
- • **Compact & Space-Smart:** At just 14.5" x 13", this heater fits perfectly in tight boat spaces without compromising capacity.
- • **Marine-Grade Durability:** Alcoa Alclad aluminum inner tank with white epoxy coating resists corrosion and stands up to harsh marine environments.
- • **Dual Heat Source Flexibility:** Seamlessly switch between engine coolant heat exchange and 120V electric power for ultimate convenience on the water.
- • **Precision Temperature Control:** Built-in thermostat maintains a consistent 140°F, ensuring your hot water is always just right.

## Overview

The Whale Marine S300W is a compact 3-gallon marine water heater designed for boats, featuring a dual heat source system that uses engine coolant or 120V electric power. Its durable Alcoa Alclad aluminum tank with white epoxy coating ensures corrosion resistance, while a thermostat maintains water temperature at 140°F. Safety is prioritized with a temperature pressure relief valve and large drain valve, making it a reliable and efficient choice for marine hot water needs.

## Description

New Whale Seaward S300W (S-300-W) horizontal marine water heater for use on boats. Tank size is 3 US gallons. This is a combination water heater and can run on engine coolant heat exchange, 120 volt AC, or both. Actual product dimensions are 14.5" wide by 14" long by 13" high (including length of hold down brackets). Thermostat regulates electric heating element temperature at 140 degrees F. Heat exchanger barbs (5/8" O.D.) are on the side of the tank, while the drain, inlet, outlet, and other fittings are on the front (see picture). Inner tank is made from Alcoa Alclad aluminum. Exterior is White Epoxy Coated Aluminum. Temperature pressure relief valve. Large 3/4" drain valve. Hold-down brackets are securely welded to inner tank.

## Features

- Thermostat regulates electric heating element temperature at 140 degrees F.
- Inner tank is made from Alcoa Alclad aluminum
- Temperature pressure relief valve.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Whale Seaward |
| Product Dimensions | 14.5"W x 13"H |
| Color | White |
| Wattage | 3000 watts |
| Voltage | 120 Volts |
| Maximum Temperature | 140 Degrees Fahrenheit |
| Style | Indoor Installation |
| Mounting Type | Wall |
| Manufacturer | ATTwood |
| Item Depth | 13 inches |
| UPC | 682500933554 |
| Item Weight | 16 pounds |
| Manufacturer Part Number | S300W |

## Product Details

- **Brand:** Whale Seaward
- **Product Dimensions:** 14.5"W x 13"H
- **Color:** White
- **Wattage:** 3000 watts
- **Voltage:** 120 Volts

## Images

![Whale Marine S300W 3 Gallon Hot Water Heater W/Side Heat Exchanger - White Epoxy - 120v - 1500w - Image 1](https://m.media-amazon.com/images/I/61hxFVRz6rL.jpg)

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**Shop now:** [https://www.desertcart.hr/products/26486459-whale-marine-s300w-3-gallon-hot-water-heater-w-side](https://www.desertcart.hr/products/26486459-whale-marine-s300w-3-gallon-hot-water-heater-w-side)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-02-24*