Hydor heating THEO 25 W
The Theo heating element from Hydor, is a unique heating element for aquariums that uses the exclusive PTC (Positive Thermal Coefficient) technology.
The Theo heating no longer has bimetal, but a very reliable micro switch. The heating coil has been replaced by a virtually indestructible polymer film.
Benefits
- When dry, the heating switches off automatically after 45 seconds.
- Heating pipe does not crack when it is warmly taken out of the water and placed back in the piping hot after a while.
- Maximum safety, because thanks to the PTC and the unbreakable tube, the heating element is resistant to thermoshocks.
- Free placement in the aquarium: vertical and horizontal, also fully submerged.
- Available in different wattages for the most common aquarium sizes.
Technical info
- Theo 25 watts
- Aquarium capacity up to 25 liters

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Stock status of products
Product is in stock
You can see this on the product page, above the price of the product. Here you will always find the most current stock status of the product. If your order consists entirely of products that are available from stock, your order will be packed and shipped immediately.Pick up stock product
You must place the order online and choose pick up. Your order will then be prepared for you. As soon as it is ready to be picked up, you will receive a notification by e-mail and/or SMS.A pick-up order placed before 14:00 is usually ready to be picked up the same day.
Shipping costs to other EU countries
Country | Parcel | Pallet small | Pallet big | Livestock | Free shipping | ||
---|---|---|---|---|---|---|---|
0-10 kg | 10-20 kg | 20-30 kg | Max. 250 kg | Max. 500 kg | Max. 30 kg | ||
Afghanistan | € 125.00 | € 125.00 | € 159.00 | On request | On request | Not possible | € 2000.00 |
Albania | € 48.00 | € 79.00 | € 109.00 | On request | On request | Not possible | € 1000.00 |
Algeria | € 69.00 | € 99.00 | € 139.00 | On request | On request | Not possible | € 1500.00 |
Andorra | € 49.00 | € 99.00 | € 149.00 | On request | On request | Not possible | € 2000.00 |
Angola | € 109.00 | € 149.00 | € 199.00 | On request | On request | Not possible | € 2000.00 |
Anguilla | € 139.00 | € 139.00 | € 139.00 | On request | On request | Not possible | € 2000.00 |
Argentina | € 69.00 | € 149.00 | € 199.00 | On request | On request | Not possible | € 10000.00 |
Armenia | € 69.00 | € 149.00 | € 249.00 | € null | On request | Not possible | € 10000.00 |
Aruba | € 59.99 | € 149.00 | € 249.00 | On request | On request | Not possible | € 10000.00 |
Australia | € 89.00 | € 199.00 | € 299.00 | € 499.00 | € 999.00 | Not possible | € 10000.00 |
Austria | € 10.99 | € 12.99 | € 19.99 | On request | On request | € 37.49 | € 500.00 |
Azerbaijan | € 129.00 | € 229.00 | € 329.00 | On request | On request | Not possible | € 10000.00 |
Bangladesh | € 76.00 | € 149.00 | € 249.00 | On request | On request | Not possible | € 10000.00 |
Belarus | € 29.99 | € 29.99 | € 29.99 | On request | On request | Not possible | € 10000.00 |
Belgie | € 7.95 | € 7.95 | € 7.95 | € 50.00 | € 75.00 | € 10.00 | € 50.00 |
Brazil | € 89.00 | € 89.00 | € 89.00 | On request | On request | Not possible | € 10000.00 |
Bulgaria | € 32.49 | € 32.49 | € 32.49 | On request | On request | € 59.99 | € 10000.00 |
Canada | € 75.00 | € 75.00 | € 99.00 | On request | On request | Not possible | € 10000.00 |
Chile | € 231.349 | € 231.349 | € 231.349 | On request | On request | Not possible | € 10000.00 |
China | € 49.00 | € 119.00 | € 169.00 | On request | On request | Not possible | € 5000.00 |
Costa Rica | € 69.00 | € 69.00 | € 69.00 | On request | On request | Not possible | € 10000.00 |
Croatia | € 29.00 | € 39.00 | € 39.00 | On request | On request | € 59.00 | € 500.00 |
Cyprus | € 59.00 | € 99.00 | € 179.00 | On request | On request | € 59.99 | € 5000.00 |
Czech Republic | € 23.49 | € 23.49 | € 23.49 | On request | On request | € 59.00 | € 10000.00 |
Denmark | € 35.99 | € 35.99 | € 35.99 | On request | On request | € 59.00 | € 10000.00 |
England | € 35.00 | € 35.00 | € 35.00 | On request | On request | Not possible | € 10000.00 |
Estonia | € 27.99 | € 27.99 | € 27.99 | On request | On request | € 59.99 | € 1000.00 |
Fiji | € 125.00 | € 125.00 | € 125.00 | On request | On request | Not possible | € 10000.00 |
Finland | € 39.99 | € 39.99 | € 39.99 | On request | On request | € 59.99 | € 10000.00 |
France | € 19.99 | € 19.99 | € 27.99 | On request | On request | € 34.99 | € 500.00 |
Germany | € 12.99 | € 12.99 | € 12.99 | On request | On request | € 32.99 | € 500.00 |
Greece | € 32.99 | € 32.99 | € 32.99 | On request | On request | € 59.99 | € 10000.00 |
Hong Kong | € 89.00 | € 89.00 | € 89.00 | On request | € 89.00 | Not possible | € 10000.00 |
Hungary | € 25.00 | € 25.00 | € 25.00 | On request | On request | € 59.99 | € 10000.00 |
Iceland | € 59.99 | € 79.99 | € 109.99 | On request | On request | Not possible | € 10000.00 |
India | € 109.00 | € 109.00 | € 109.00 | On request | On request | Not possible | € 10000.00 |
Indonesia | € 79.00 | € 79.00 | € 79.00 | On request | On request | Not possible | € 10000.00 |
Ireland | € 27.49 | € 27.49 | € 27.49 | On request | On request | € 59.00 | € 10000.00 |
Israel | € 125.00 | € 125.00 | € 159.99 | On request | On request | Not possible | € 10000.00 |
Italy | € 29.99 | € 29.99 | € 29.99 | On request | On request | € 49.99 | € 500.00 |
Japan | € 125.00 | € 125.00 | € 125.00 | On request | On request | Not possible | € 10000.00 |
Jordan | € 59.00 | € 59.00 | € 59.00 | On request | On request | Not possible | € 10000.00 |
Kuwait | € 79.00 | € null | € null | € null | On request | Not possible | € 10000.00 |
Latvia | € 26.99 | € 26.99 | € 26.99 | On request | On request | € 59.00 | € 10000.00 |
Lebanon | € 99.00 | € 99.00 | € 99.00 | On request | On request | Not possible | € 10000.00 |
Lithuania | € 24.99 | € 24.99 | € 24.99 | On request | On request | € 59.99 | € 10000.00 |
Luxembourg | € 19.50 | € 19.50 | € 19.50 | On request | € 149.99 | € 49.00 | € 100.00 |
Malaysia | € 59.00 | € 59.00 | € 59.00 | On request | On request | Not possible | € 10000.00 |
Malta | € 64.99 | € 119.00 | € 169.00 | On request | On request | € 79.00 | € 1500.00 |
Mauritania | € 99.00 | € 99.00 | € 99.00 | On request | On request | Not possible | € 10000.00 |
Mauritius | € 79.00 | € 79.00 | € 79.00 | On request | On request | Not possible | € 10000.00 |
Mexico | € 129.00 | € 129.00 | € 129.00 | On request | On request | Not possible | € 10000.00 |
Moldova | € 79.00 | € 79.00 | € 79.00 | On request | On request | Not possible | € 10000.00 |
Montenegro | € 79.00 | € 79.00 | € 79.00 | On request | On request | Not possible | € 10000.00 |
Morocco | € 199.00 | € 199.00 | € 199.00 | On request | On request | Not possible | € 10000.00 |
Nederland | € 6.99 | € 7.99 | € 8.99 | € 40.00 | € 60.00 | € 7.99 | € 50.00 |
New Zealand | € 137.79 | € 137.79 | € 137.79 | On request | On request | Not possible | € 10000.00 |
North Korea | € 189.00 | € 189.00 | € 189.00 | On request | On request | Not possible | € 10000.00 |
North Macedonia | € 49.00 | € 49.00 | € 49.00 | On request | On request | Not possible | € 10000.00 |
Norway | € 59.00 | € 59.00 | € 59.00 | On request | € 19.00 | Not possible | € 10000.00 |
Philippines | € 69.00 | € 69.00 | € 69.00 | On request | On request | Not possible | € 10000.00 |
Poland | € 8.99 | € 8.99 | € 14.99 | On request | On request | € 59.00 | € 300.00 |
Portugal | € 27.99 | € 27.99 | € 27.99 | € 149.99 | € 299.99 | € 54.99 | € 750.00 |
Qatar | € 149.00 | € 149.00 | € 149.00 | On request | On request | Not possible | € 10000.00 |
Romania | € 22.99 | € 22.99 | € 22.99 | On request | On request | € 59.00 | € 10000.00 |
Russia | € 149.99 | € 249.0§ | € 349.00 | On request | On request | Not possible | € 10000.00 |
Saudi Arabia | € 69.99 | € 69.99 | € 69.99 | On request | On request | Not possible | € 10000.00 |
Serbia | € 64.99 | € 64.99 | € 64.99 | On request | On request | € 129.00 | € 10000.00 |
Seychelles | € 79.99 | € 79.99 | € 79.99 | On request | On request | Not possible | € 10000.00 |
Singapore | € 39.00 | € 79.00 | € 129.00 | On request | € 14.99 | Not possible | € 10000.00 |
Slovakia | € 27.99 | € 27.99 | € 27.99 | On request | On request | € 59.99 | € 10000.00 |
Slovenia | € 24.99 | € 24.99 | € 24.99 | On request | On request | € 59.99 | € 10000.00 |
South Africa | € 129.00 | € 129.00 | € 129.00 | On request | On request | Not possible | € 10000.00 |
South Korea | € 99.00 | € 99.00 | € 99.00 | On request | On request | Not possible | € 10000.00 |
Spain | € 27.99 | € 27.99 | € 27.99 | On request | On request | € 69.00 | € 10000.00 |
Sweden | € 18.99 | € 18.99 | € 29.99 | On request | On request | € 59.99 | € 10000.00 |
Switzerland | € 49.99 | € 49.99 | € 49.99 | On request | On request | Not possible | € 10000.00 |
Thailand | € 59.00 | € 59.00 | € 59.00 | On request | On request | Not possible | € 10000.00 |
Turkey | € 79.00 | € 79.00 | € 79.00 | On request | On request | Not possible | € 10000.00 |
Uganda | € 75.00 | € 75.00 | € 75.00 | On request | On request | Not possible | € 10000.00 |
Ukraine | € 49.00 | € 49.00 | € 49.00 | On request | € 9.99 | € 79.00 | € 10000.00 |
United Arab Emirates | € 79.00 | € 79.00 | € 79.00 | On request | On request | Not possible | € 10000.00 |
United Kingdom | € 35.00 | € 35.00 | € 35.00 | On request | On request | € 119.00 | € 1000.00 |
United States | € 79.00 | € 149.99 | € 199.00 | On request | On request | Not possible | € 5000.00 |
Uzbekistan | € 129.00 | € 129.00 | € 129.00 | On request | On request | Not possible | € 20000.00 |
Vietnam | € 79.00 | € 149.00 | € 249.00 | On request | On request | Not possible | € 20000.00 |
Shipment
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Above € 50,- free delivery in NL & BEFree delivery in NL & BEIn stock Ordered before 16:00, shipped today *No stock Notify me when this product is in stockThere is a minimum of 24 hours between the time of ordering and shipping due to the extra care for correct packaging and shipping. For corals additional packaging and shipping charges apply.



Ocean Store



Ocean Store is a modern webshop with a large selection of reef aquarium equipment, supplements and food for your (marine) aquarium. We excel in reachability, service and speed. Not only in delivery of your ordered goods, but also in the adequate answering of your (marine) aquarium related questions. We are happy to share our passion for reef aquariums with you!
Open: Available Monday / Friday 9:00-20:00
Phone: +31(0)78-6456669
€ 0.99 - € 2999.99
EUR
479190
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Hydor heating THEO 25 W
The THEO heaters are equipped with PTC technology, which provides a more conscious energy consumption and guarantees that the device switches itself off when there is no longer any contact with water.... In stock€ 31.99 € 27.49
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T-11100 The THEO heaters are equipped with PTC technology which results in a more conscious energy consumption and guarantees that the device switches itself off when there is no more contact with water ...
Hydor heating THEO 100 W
T-11200 The THEO heaters are equipped with PTC technology which results in a more conscious energy consumption and guarantees that the device switches itself off when there is no more contact with water ...
Hydor heating THEO 150 W
T-11600 The THEO heaters are equipped with PTC technology which results in a more conscious energy consumption and guarantees that the device switches itself off when there is no more contact with water ...
Hydor heating THEO 200 W
T-11300 The THEO heaters are equipped with PTC technology which results in a more conscious energy consumption and guarantees that the device switches itself off when there is no more contact with water ...
Hydor heating THEO 300 W
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