---
product_id: 2334478
title: "Hydor ETH 200 In-Line External Aquarium Heater, 200w, 1/2\" hose"
brand: "ferplast"
price: "$13.97"
currency: USD
in_stock: false
reviews_count: 5
url: https://www.desertcart.us/products/2334478-hydor-eth-200-in-line-external-aquarium-heater-200w-1
store_origin: US
region: United States of America
---

# Marine & tropical ready External installation Precision control Hydor ETH 200 In-Line External Aquarium Heater, 200w, 1/2" hose

**Brand:** ferplast
**Price:** $13.97
**Availability:** ❌ Out of Stock

## Summary

> 🔥 Keep Your Aquatic World Thriving!

## Quick Answers

- **What is this?** Hydor ETH 200 In-Line External Aquarium Heater, 200w, 1/2" hose by ferplast
- **How much does it cost?** $13.97 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/2334478-hydor-eth-200-in-line-external-aquarium-heater-200w-1)

## Best For

- ferplast enthusiasts

## Why This Product

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

## Key Features

- • **Flexible Fit:** Compatible with 1/2 inch hoses, ensuring seamless integration into your existing system.
- • **Stay in Control:** High precision electronic temperature control ensures your aquatic environment is always just right.
- • **Effortless Setup:** Designed for external use, this heater simplifies your aquarium maintenance.
- • **Powerful Performance:** 200W of heating power guarantees optimal temperatures for your aquatic life.
- • **Versatile Compatibility:** Perfectly suited for both marine and tropical aquariums, making it a must-have for diverse setups.

## Overview

The Hydor ETH 200 In-Line External Aquarium Heater is a powerful 200W heater designed for both marine and tropical aquariums. It features high precision electronic temperature control and is compatible with 1/2 inch hoses, making it easy to install and maintain.

## Description

ETH Heaters are the first external heaters for aquariums with the exclusive PTC technology. Designed to be used on return lines coming from canister filters or sumps.

## Features

- Suitable for marine and tropical aquariums
- Easy to use
- High precision electronic temperature control
- For external use
- 1/2 inch hose

## Images

![Hydor ETH 200 In-Line External Aquarium Heater, 200w, 1/2" hose - Image 1](https://m.media-amazon.com/images/I/812pkFj2f+L.jpg)
![Hydor ETH 200 In-Line External Aquarium Heater, 200w, 1/2" hose - Image 2](https://m.media-amazon.com/images/I/61lTqKjNxmL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worked great!  Then it didn't... Maybe... No Customer Support.
*by D***B on July 24, 2013*

If it kept working and was accurate, it would have gotten 5 stars, but it stopped working within a month.Pros: Ok, So this product represents an amazing idea. I love the fact that there is nothing in the tank, the whole tank is evenly heated, and I don't have to reach into the tank to maintain the heater, or change the settings. When I first set up this heater, install was easy, it worked great, heated the tank well, etc. Everything I wanted out of a heater.Cons: The temp dial on my unit doesn't seem to work. I orrigionally heated the tank to 90 degrees (before I put fish in it, on day one of cycling) then I did fine adjustments till it was a the right temp. the knob was at the lowest setting (in the 60-70 degree range) and my temp was still at 80+ degrees. The major problem happened when I cleaned my canister filter. I unplugged everything, cleaned the filter, reassembled and plugged back in, after that the heater would no longer turn on (red light didn't light up, no matter where I put the dial, it hovers around 80 degrees.) My thought is, it has been 90+ degrees air temp in my town for the last few weeks and that is why my temp is still where it should be, because it is around 80 degrees in my house. My worry is that when it cools off, so will my tank.I contacted customer service phone number in the manual to get a warranty replacement or repair, the phone line directed me to contact them via E-mail (I guess they don't do phone customer service???)As instructed by the phone message, I sent an e-mail to their customer service e-mail regarding the issues I've been having... I waited a day or two, and got back this e-mail as a response:"Subject: Hydor USA Customer Service is out of the office.I will be out of the office starting 07/23/2013 and will not return until 07/25/2013.Hydor USA Customer Service is out of the office . We will respond to your email upon our return. Emails will be answered in the order that they are received.Please keep in mind that there maybe some delay in a reply due to the backlog of requests.Have a nice day.Thank you.Hydor USA, Inc.Customer Service"Still waiting to hear about a replacement. I will update this review if and when I hear from customer support.**UPDATE 12/11/13**I never did hear back from customer service, however... Amazon is AMAZING, and ended up helping me out.I found the cause of the problems with my heater to in fact be my tank, and not the heater at all. Shortly after my heater broke I figured out that my tank had a crack in it, and water had leaked out the back/bottom of the tank down the return water tube and into the heater...I have since fixed my tank and gotten a new Hydor In-Line Heater and it has been working like a champ. Due to the issues I had in the past with heating, I decided to pair my heater with a Finnex Max-300 Digital Aquarium Heater Controller. This setup has been working GREAT! My tank temp never fluctuates. I highly recommend this setup to anybody looking to get rid of clutter in their tanks, and who would like a stable, safe, and accurate heating setup.**Update** 2/28/14Still running like a champ. I changed to a 5 stars from a 3 because this heater has been amazing. Combined with the Finnex Max-300 Digital Aquarium Heater Controller, this heater has kept my tank at an absolute steady temp. If your on the fence about this heater, I would say, get it. :)

### ⭐⭐⭐⭐⭐ Working Great!
*by E***F on April 2, 2025*

It is now 2025, I bought this back in Dec 2023. So far no issues and it heats up my tank well.

### ⭐ Sadly, It's not good news
*by K***I on April 24, 2018*

After reading reviews of this thing overheating, I thought I should share my experience.. Got mine hooked up easy enough and it kept spot on temp for around 3 months. Entered the fish room one morning to find that my tropical tank that should be at 80 F was sitting on 70 F! Dropped 10 degrees in 10 hours overnight. Luckily no fish lost, but had to put the unsightly, space hogging, but tried and true, reliable old heater back inside the tank. I've searched everywhere for info on cleaning this thing out, or to find out if there's some magical fix. I clean my Hydor external filter every 2 weeks religiously and those lines stay extremely clean (pre-filter on intake), so I wouldn't imagine it's gunked up, since they aren't. I'll try to call Hydor tomorrow and see how they stand behind their products that fail, since I buy so many. I have a Hydor Pro 350 external canister filter, several in tank heaters, a few Koralia circulation pumps and a bunch of the bubble makers (which I love, love, love!)I've only had one small problem with any of their products so far. When I got the External filter, one of my screw downs for the intake hose would not go on straight and cut into my hose deeply. I can only imagine it had a burr on the plastic threads that I could not see, or get to (although I tried) in order to fix it myself and get it hooked up and going that day. I did contact the company and sent another out, in no apparent rush, but hey... they sent it, not going to complain. I'm not near as forgiving when it comes to the fail of an electrical part with water involved. It's hard to trust them not to kill all your fish, or God forbid, burn my house down.. with me in it! YIKES! I'll update after I find out their response to the problem.

## Frequently Bought Together

- Hydor ETH 200 In-Line External Aquarium Heater, 200w, 1/2" hose
- API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored
- Seachem Indoor Purigen Organic Filtration Resin - Fresh and Saltwater 100 ml

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-07*