---
product_id: 50084449
title: "Hydor External Heater Aquariums ETH 200 W Sump and External Filters, Safe and Precise, Tube Diameter 16 mm"
brand: "hydor"
price: "€ 126.65"
currency: EUR
in_stock: true
reviews_count: 9
category: "Hydor"
url: https://www.desertcart.it/products/50084449-hydor-external-heater-aquariums-eth-200-w-sump-and-external
store_origin: IT
region: Italy
---

# 200W high power output 16mm tube diameter, easy pipe integration Precise 18°-34°C electronic control Hydor External Heater Aquariums ETH 200 W Sump and External Filters, Safe and Precise, Tube Diameter 16 mm

**Brand:** hydor
**Price:** € 126.65
**Availability:** ✅ In Stock

## Summary

> 🔥 Keep your tank perfectly heated, effortlessly and safely!

## Quick Answers

- **What is this?** Hydor External Heater Aquariums ETH 200 W Sump and External Filters, Safe and Precise, Tube Diameter 16 mm by hydor
- **How much does it cost?** € 126.65 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/50084449-hydor-external-heater-aquariums-eth-200-w-sump-and-external)

## Best For

- hydor enthusiasts

## Why This Product

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

## Key Features

- • **Safety-First Innovation:** Exclusive PTC self-protection film prevents overheating, ensuring your aquatic life stays safe and sound.
- • **Seamless Aquarium Integration:** Designed for vertical mounting with a special eyelet and 16mm tube compatibility for smooth connection to external filters and sumps.
- • **Effortless Temperature Mastery:** Set and forget with ultra-precise electronic control from 18° to 34°C for stable aquatic environments.
- • **Perfect for Mid-Size Aquariums:** Optimized for 100-200L tanks with up to 10°C temperature differential, ideal for professional setups demanding reliability.
- • **Built to Last, Built to Perform:** Durable construction resists algae and limestone buildup—just a quick soft brush clean keeps it running like new.

## Overview

The Hydor ETH 200W External Heater is a high-efficiency, durable aquarium heater designed for vertical installation in sumps and external filters. Featuring precise electronic temperature control adjustable between 18°C and 34°C, it incorporates Hydor’s exclusive PTC self-protection technology to prevent overheating. With a 16mm tube diameter for easy integration and a robust build that resists algae and limestone, it’s ideal for aquariums from 100 to 200 liters, delivering stable, safe heating for your aquatic ecosystem.

## Description

Product Description Eth is a heater for aquariums also suitable for sump collection tanks and external filters for vertical positioning only. Accurate thanks to the electronic temperature control, it is specially designed to guarantee high resistance and avoid the risk of overheating thanks to the innovative self-protection Ptc heating element, an exclusive Hydor technology. Equipped with a special eyelet for fixing, it can be easily connected to pipes or other technical components for aquariums. It is possible to set the temperature between 18° C and 34° C. Eth heaters are available in various models with different power and internal tube thickness, they can be combined with the Prime external filter by Hydor. Cleaning tips: Periodically clean the heating tube with a soft brush to prevent algae and limestone. Directions Read instructions before use P.when('A').execute(function(A) { A.on('a:expander:toggle_description:toggle:collapse', function(data) { window.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Box Contains 1 x External Heater See more

Review: Great external heater - I bought this 300watt heater to heat a 340 litre aquarium thinking it might not be powerful enough and that I might need 2 of them. If I take into account substrate, rocks and empty space there’s probably around 280 litres of water. I had it set to 29c to cycle the tank in a room that varies from 15c at night to 20c during the day and once up to temperature (which took over 24hours) it didn’t fluctuate, so it should easily maintain 24c once full of fish. Build quality seems really good, time will tell. I’ve read about people whose heaters have cooked their fish, so I have it connected to an Inkbird ITC-306A dual probe temperature controller which will stop that from happening. It is connected to a Fluval FX4 which was a nightmare to connect as the heater has 16mm connectors and the FX4 has 25mm connectors. With a selection of Y connectors, reducers and Jubilee clips, I was able to split the 25mm return tube into a 16mm for the heater and a 20mm bypass so as not to interfere with the flow/pressure and back to a single 25mm return. After a lot of faffing around it all works perfectly with zero leaks.
Review: Cool Heater. - Forgive the Title I know its a poor effort at a joke. Now on to the serious business I rid my Juwel aquarium of its standard interior filter and heater,I fitted an JBL CristalProfi external filter and this fantastic external heater, its running now for about two weeks and no leaks or problems,Its quite heavy and needs support in other words don't rely on the tubing carrying the aquarium water to support it,I used a long plastic cable tie which I fed through the loop on the heater and attached with a hook to the top of the aquarium.The temperature control on the heater is precise, and reliable,two important things before I finish when Hydor say a 16 or 12mm hose that is the inside bore measurement of the hose coming from your external filter and because the tubing is a tight fit I found fitting the tubing to the heater first the best way to approach the job.

## Features

- Innovative external heater for aquariums with high efficiency and durability. Technology with protective Ptc film that avoids overheating for maximum safety.
- Also suitable for external filters and sump collection tanks, it should be positioned only vertically. Complete with special eyelet for fixing, connectable to pipes and other accessories for aquariums.
- Precise thanks to the electronic temperature control, which can be set between 18° C and 34° C. The heater can be combined with the Hydor Prime external filter.
- Regular cleaning of the heating tube with a soft brush is recommended to prevent algae and limestone
- Power 200 W. Overall dimensions: height 30,5 cm. Inner tube diameter: 16 mm. Recommended for aquariums from 100 to 200 litres with Δ up to 8° C, aquariums from 100 to 180 litres with Δ up to 10° C.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B008N9NY08 |
| Batteries Included | No |
| Batteries required | No |
| Best Sellers Rank | 39,820 in Pet Supplies ( See Top 100 in Pet Supplies ) 105 in Aquarium Heaters |
| Colour | Black |
| Customer Reviews | 3.9 3.9 out of 5 stars (142) |
| Date First Available | 20 July 2012 |
| Item Weight | 466 g |
| Item model number | T08115 |
| Number of Items | 1 |
| Pet Type | Amphibian, Fish and Aquatic |
| Product Dimensions | 8 x 7 x 31 cm; 466 g |
| Quantity | 1 |
| Size | 16 mm |
| Specific Uses | Indoor |

## Images

![Hydor External Heater Aquariums ETH 200 W Sump and External Filters, Safe and Precise, Tube Diameter 16 mm - Image 1](https://m.media-amazon.com/images/I/413MTAZQ4RL.jpg)
![Hydor External Heater Aquariums ETH 200 W Sump and External Filters, Safe and Precise, Tube Diameter 16 mm - Image 2](https://m.media-amazon.com/images/I/51umXAfi1eL.jpg)
![Hydor External Heater Aquariums ETH 200 W Sump and External Filters, Safe and Precise, Tube Diameter 16 mm - Image 3](https://m.media-amazon.com/images/I/41ZCf1U-J6L.jpg)

## Available Options

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

## Questions & Answers

**Q: How effectively will it heat a 300 liter tank?**
A: Mine is a 350 litre tank and it maintains 77 degrees Fahrenheit fine for years now. Just turn it off about 10 minutes before maintenance on the filter as there won’t be any water passing over the element and you don’t want it to overheat.

**Q: Can the 300 watt be used with the fluval 406 (ie. is the tube measurements compatible)**
A: Yes fits 16/ 22 mm hope this helps ..also this is a very good heater.aquarium temps allways stable.

**Q: What happens if the external pump stops working and no water flows throught the heater. Will this heater overheat?**
A: Yes but should shutoff when the water in the pipe reaches the thermostat temp. I wouldn't recommend these as the thermostat failed in the on position on mine. It cooked my tank and most of the fish in it :(

**Q: Does this need to go through a filter or can it just be used on its own. Thanks**
A: It needs a filter or some kind of pump. Otherwise it wouldn't function properly and overheat.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great external heater
*by W***6 on 17 November 2020*

I bought this 300watt heater to heat a 340 litre aquarium thinking it might not be powerful enough and that I might need 2 of them. If I take into account substrate, rocks and empty space there’s probably around 280 litres of water. I had it set to 29c to cycle the tank in a room that varies from 15c at night to 20c during the day and once up to temperature (which took over 24hours) it didn’t fluctuate, so it should easily maintain 24c once full of fish. Build quality seems really good, time will tell. I’ve read about people whose heaters have cooked their fish, so I have it connected to an Inkbird ITC-306A dual probe temperature controller which will stop that from happening. It is connected to a Fluval FX4 which was a nightmare to connect as the heater has 16mm connectors and the FX4 has 25mm connectors. With a selection of Y connectors, reducers and Jubilee clips, I was able to split the 25mm return tube into a 16mm for the heater and a 20mm bypass so as not to interfere with the flow/pressure and back to a single 25mm return. After a lot of faffing around it all works perfectly with zero leaks.

### ⭐⭐⭐⭐⭐ Cool Heater.
*by N***D on 10 January 2013*

Forgive the Title I know its a poor effort at a joke. Now on to the serious business I rid my Juwel aquarium of its standard interior filter and heater,I fitted an JBL CristalProfi external filter and this fantastic external heater, its running now for about two weeks and no leaks or problems,Its quite heavy and needs support in other words don't rely on the tubing carrying the aquarium water to support it,I used a long plastic cable tie which I fed through the loop on the heater and attached with a hook to the top of the aquarium.The temperature control on the heater is precise, and reliable,two important things before I finish when Hydor say a 16 or 12mm hose that is the inside bore measurement of the hose coming from your external filter and because the tubing is a tight fit I found fitting the tubing to the heater first the best way to approach the job.

### ⭐ cons
*by N***N on 11 May 2015*

It worked wonders from day 1 but 6 months in it has failed. ended up overheating and causing a leakage from unit. Lost around 25 litres of water from my tank as its external. Luckily I was in As I have £300 of discus in my tank Could have been alot worse I know it's under warranty but I won't trust to use this product again as many others have experienced same type of faults . Not worth the £80 I paid. Back to the old reliable internal heater it is

## Frequently Bought Together

- Hydor External Heater Aquariums ETH 200 W Sump and External Filters, Safe and Precise, Tube Diameter 16 mm
- Seachem Prime Water Conditioner, 100 ml
- Seachem Stability Tank Stabilization System, 500 ml

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-03-15*