External heater for freshwater aquariums from 160 to 600 l

  • In-line heater integrated into the hose of the external aquarium filter, removing the need for a heater INSIDE an Aquarium
  • Easy installation: cut through the hose from the external filter that feeds the water back into the aquarium, insert the external heater in between, insert the plug and set the water temperature you want
  • The integration in the filter circuit ensures a very even distribution of the water temperature with an accuracy of +/- 0.5 °C and a switching interval of 1.0 °C in the aquarium
  • LED display of current and desired temperature. Interchangeable, screw-on (3/4'') hose connections for 12/16, 16/22 and 19/25 mm incl. hose securing. Total length 30.5 cm
  • Package contents: 1 in-line heater 500 W for aquariums from 160-600 l (100-150 cm) with hose connections for 12/16, 16/22 and 19/25 mm and cleaning brush
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Price: 55,49 €
Recommended retail price incl. VAT
You can find this item in your specialist and online shop
Product information

Most aquarium fish come from tropical waters and need water temperatures between 22 and 30 °C. In community aquariums with fish/invertebrates from different regions, a water temperature of 24-26 °C has shown to be effective. 30 °C is only suitable for some fish breeding (e.g. discus fish). Many shrimp species come from cooler waters and do not tolerate temperatures of 25-30°C.

The water temperature should be set with an "adjustable heater" which regulates the temperature automatically. For this purpose, there are rod-shaped heaters which are fixed in the aquarium (JBL ProTemp s) in various wattages and external heaters/in-line heaters which are integrated in the water-returning hose of an external filter (JBL ProTemp e) in two wattages. The advantage of external heaters is that it is one less product to be placed INSIDE the aquarium and the distribution of heat in the aquarium is more even. In addition, the digital display of the external heater always clearly shows the current water temperature. The outdoor heaters can of course also be operated with a separate water pump.

Undergravel heating is NOT used to set the water temperature. An undergravel heating cable ensures a better flow of water through the substrate of the aquarium, as the heated water at the heating cable rises and colder water flows into the areas between the heating cables. Thus nutrients are flushed to the plant roots and ensure optimal plant growth. Undergravel heating cables must always be supplemented by a "main heater" (JBL ProTemp s or e).



Art. no.:
EAN Code:
160-600 l
Volume packaging:
2.6 l
Gross weight:
500 g
Net weight:
400 g
Weight factor:
Packaging dimensions (l/h/w):
85/350/90 mm


Animal species: Armored catfish, Arowana, Axolotl, Barbels, Bettas, Bichirs/reedfish, Blowfish, Catfish, Cichlids (South America), Clawed frogs, Clawed shrimps, Crayfish, Crustaceans, Danions, Discus, Dwarf crayfish, Dwarf shrimps, Flowerhorn, Goldfish, Gouramis, Guppy, Juvenile fish, Killifish, Livebearers, Loaches, Mussels, Panchaxes, Rainbowfish, Snails, Spiny eels, Terrapins, Tetra, Veiltails, blood parrot cichlids, freshwater butterflyfish
Animal size: For all animal sizes
Animal age group: All aquarium and terrarium animals
Material: plastic (PC) / glass
Colour: dark grey

Electronic label / illuminant

Mercury: No
Dimmable: No

Technical Data

capacity in litres:600 l
capacity from - to:160-600l
capacity tank length:150 cm
power output in Watt:500 W
Height:295 mm
Length:90 mm
Width:80 mm
voltage:240 V
What does the indication E-1 to E-8 on the display of my external heater mean?

As already described in the operating instructions, E stands for Error and indicates an error in the operation of the JBL PROTEMP external heater. Here you can see how each message can be easily solved.

E-1: Cause: Water temperature is at least 1 °C above the set temperature. Solution: Regulates itself when water temperature drops.
E-2: Cause: No water or air bubbles in the heater. Solution: Ensure that the heater is positioned as vertically as possible and that there is sufficient water flow.
E-3: Cause: Electronics defective. Solution: Can only be fixed by a specialist.
E-8: Cause: Temperature above 93°C. No water flow, or the inside is too soiled. Solution: Clean the inside of the heater with a hose brush (see chapter 8 Maintenance) and ensure sufficient water flow.

Does the alignment of the external heater matter during its installation?

Yes, because temperature measuring requires constant contact with the water. When installing, please pay attention to the flow direction marked by arrows on the heater housing. Attach the heater to the suspension loop provided for this purpose in a position as vertical as possible with the flow direction pointing upwards. This is the only way to ensure that the device is vented and that the temperature measuring functions properly.

What water pressure are the PROTEMP e in-line heaters designed for?

This device may only be used for heating aquariums in the private area. For this purpose, the in-line heater is connected to an external filter or a feed pump. These systems are unpressurised systems which only use the principle of circulation and do not build up any pressure, as the inlet and outlet also provide an additional drain and the impeller does not build up any water pressure when pumping. The use of accessories or parts not recommended by the manufacturer can lead to hazardous situations and a loss of warranty. Installations on pressure pumps or directly on water pipes are therefore not possible.

Where should you install the external heater?

First place the JBL PROTEMP e In-line heater on the outlet side of the external filter, before positioning the UV-C units, CO2 diffusers and other attachments. If this is not possible, you can still install the heater after the UV-C unit, but then only install diffusers behind it.

Blog (opinions & experiences)

JBL TV #61 Species-appropriate keeping of water turtles Part 1 – Setup and lighting

This part deals with the size of the terrarium, the setup, suitable substrates, creating water and land sections, the correct lighting with and without UV, how to use heat mats, and heating the water section.

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JBL TV #54 The right water temperature – all the facts about temperature in the aquarium

A conversation with the chief biologist of the Sealife Centre in Speyer about issues which can arise in some water temperatures.

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JBL TV #49: Saving energy in the aquarium - reducing costs made easy

Yes, we can make energy savings in our aquarium, but not where most people think! In this video we show exactly where and how to save electricity costs.

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JBL TV #24: Aquarium heaters and aquarium coolers

What temperatures do our aquarium inhabitants have in the wild? How can you heat and cool your aquarium simply and effectively?

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JBL TV #19 Part 1: Aquarium Set-Up - Aquarium Technology - Where Do You Put The Heater And Filter?

Installing aquarium technology, where do you put the heater and filter?

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The JBL Intern - Aquariums in the Company

When I first entered the administrative offices, I was very impressed by the display aquariums in the boss's office and in the various conference rooms.

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Heating in the aquarium. Heating rods vs. outdoor heaters

Our houses aren’t the only things to need heating. Our fish habitats, or aquariums, also need to be kept at a constant, feel-good temperature. This can vary from aquarium to aquarium and needs to be individually regulated.

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Video: JBL PROTEMP e External Heater for Aquariums - Keeping Electricity and Technology Outside the Aquarium

External heaters remove the need for bothersome heating elements in the aquarium and are safe because the electricity stays outside. The installation could not be easier.

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Display Accuracy vs. Measuring Accuracy - Different Results When Measuring Temperatures

You may find the differences that can arise when measuring the temperature with different measuring instruments and methods, confusing. Most people tend to trust a digital device more than an analog device. Is this justified?

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JBL PROTEMP e - Heating The Inside From Outside

Nobody likes a heater in an aquarium: it’s as attractive as an old stove pipe and contains a full 230 volts. The alternative is as simple as it’s logical:

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Additional product information and downloads

safety instructions

  • safety instruction for technical devices
    • Filename:
spare parts
Customer reviews


Overall rating: 4.6
28 public review(s) for this product.

0 Reviews

25 more reviews in other languages

25 Reviews in other languages

aquaristik_influencer - German

cool wäre wenn man beim protemp500 die hysterese selber verändern könnte um in Aufzucht Becken weniger Temperatur Schwankungen zu haben

ideal wäre auch eine wifi Funktion um die Temperatur immer und überall im auge haben zu können und man eine push Benachrichtigung erhaltet bei Temperatur Schwankung etc

S. Klöcker - German

Super Heizung für mein 540L Malawibecken. Kein Heizstab mehr im Becken. Klare Kaufempfehlung

M. Lengle - German

Habe mir zwei von e 500 für meine Becken 240l und 450l bestellt. Nach dem Einbau ist der Durchlauferhitzer vom 450l Aquarium nach kurzer Zeit so heiß geworden das, das Gehäuse verkokelt ist. Am Geruch konnte ich es rechtzeitig Melekeok und das Gerät abschalten. Darauf hin hab ich den zweiten Durchlauferhitzer aus dem 240l Aquarium untersucht. Der läuft seit Januar im Becken mit. Und da hab ich festgestellt das das Ausengehäuse auch leicht verformt ist.

Ich habe beide vorsichtshalber vom Netz genommen und beim Verkäufer reklamiert. Habe auch zwei neue Geräte bekommen bin mir aber noch nicht ganz sicher ob ich das noch mal versuchen sollte. Die defekten Durchlauferhitzer sind aus dem Jahr 2022. vielleicht ist es auch eine fehlerhafte Produktionseinheit.

P. Reinhold - German


Außenheizer für Süßwasserwasser Aquarien von 160 bis 600 Liter

Ich hatte jetzt 3 verschieden Hersteller gehabt und die waren sehr Stark am Schwanken von -3 bis 6Grad aber der hält Konstant die Temperatur im Becken daher eine sehr gute Entscheidung gewesen für das Produkt

P. Hergenröther - German

Ich bin begeistert. Eine Heizung im Becken ist ja okay. Aber wenn man drauf verzichten kann ist es doch noch besser. Der Diskus mag nicht so gerne schwankende Temperaturen und mit diesem tollen Gerät habe ich eine sehr konstante Temperatur. Super einfache Montage an den Filter und kinderleicht ein zu stellen.

C. Dutzig - German

Das nenn ich mal Fortschritt, vor 25JAHREN gab es so etwas noch nicht. Funktioniert super, hat zwar 500Watt aber so selten wie die zu heizen muss ist das alles ok.

Discus.forest - German

Nutze den PROTEMP e500 in meinem 450 Liter Diskus Becken. Ich bin sehr zufrieden damit ! Die Temperatur ist konstant auf 28 grad. Am Display kann man die soll und ist Temperatur ganz einfach ablesen. Klare Kaufempfehlung!

LadyDiscus - Polish

Polecam !

T. Kappler - German

Seit ca. 6 Monaten in Betrieb. Die 500W beheizen mein 1000L Becken auch im Winter sehr zuverlässig.

Die Isolierund der Heizung nach Aussen könnte jedoch etwas besser sein, das Gerät gibt beim Heizen nicht nur viel Wärme an das Wasser, sondern auch an die Umgebung ab. Wünschenswert wäre auch, eine Justierbarkeit des Temperaturfühlers. Dieser hat fast 2°C Abweichung zu meinen anderen Thermometern. Wenns man weiß, kein Problem.

Wegen den 2 Punkten ein Stern Abzug. Aber ansonstens Empfehlenswert, würde es wieder kaufen.

tropheus_italia - Italian

Ottimo riscaldatore, con questo oggetto non c’è più bisogno del riscaldatore direttamente in vasca, veramente un ottima idea.

M. Alparslan - German

Habe es jetzt seit 10 Tagen im Betrieb . Es lässt sich Dank der verschiedenen Zollgrößen an alle gängigen Schläuche anschließen. Temperatur ist konstant auf 25 Grad das in meinem 540 LG Becken . Ein Thermometer Brauch ich auch nicht mehr da der Display die momentane Temperatur anzeigt .. für mich alternativlos und Top im Preis .

LG Mithat

S. Gleirscher - German

Super Produkt, läuft schon seit einem Jahr in meinem 550L Diskusbecken und hält die Temperatur konstant auf ca. 28°C.

fishrimps9 - Spanish

Enero, 10º en la calle, el calentador programado a 25º y la temperatura del agua se mantiene estable, no cabe duda que fue una buena compra

Aqua4Scape - German

Super leicht einzustellen. Hält die Temperatur ideal im eingestellten Bereich

P. Van Minsel - Dutch

german_monstertank - German

An 4 Becken zuhause angeschlossen und bis jetzt top zufrieden mit dem Produkt

fishrimps9 - Spanish

6 meses despues sigue manteniendo la temperatura estable en 26º en 300 litros

aquascaping.tv - German

Naprawdę polecam grzałki przepływowe a szczególnie JBL PROTEMP. Solidne wykonanie i jeden sprzęt poza akwarium do bardziej estetyczne wyglądające akwarium.

diskusowner - German

Hier hat Jbl einfach mal wieder bewiesen wie innovativ das Unternehmen ist. Es gibt kein besseres System auf dem Markt, welches das Aquarium so gut aufheizt und dabei trotzdem nicht sichtbar ist. Für mich ist dieses Produkt einfach alternativlos und ich kann es jedem nahe legen der auf ein hohes Maß an Ästhetik in seinem Becken achtet.

U. Röhr - German

Ich lass mich mal Überraschen,ob ich auf 29 grad in meinen 400 L. Becken komme Ich habe sehr viele Sachen von JBL,sind alle super.Gebe erstmals nur 3 Sterne

Comment from JBL:

Danke Ulrich, die 29 Grad wirst du erreichen, wenn die Außentemperatur nicht mehr als 5-6 °C abweicht und das Aquarium von Außen zu stark kühlt.

JustTheD90 - German

Ich durfte jetzt den JBL ProTemp e500 über mehrere Monate testen, vorne weg, ist dies einer der wenigen Inline Heizer die man auf dem Markt finden kann. Auch wenn ich diesen tatsächlich nur an einem 54 Liter Becken betreibe.

Der Heizer heizt gut und einigermaßen schnell das Wasser auf, ein überschwingen der Temperatur, selbst bei diesem überdimensionierten Heizer konnte ich nicht feststellen.

Weiterhin Positiv aufgefallen ist die Möglichkeit alle gängigen schlauch großen mit anzuschließen.

Was mich tatsächlich stört: Der Heizer bietet keine Möglichkeit zur Wand Befestigung, woraus ein durchgehender Zug am schlauch resultiert. Ich selber konnte mir per 3D Druck eine Wandhalterung drucken. Meiner Meinung nach sollte aber eine Möglichkeit mitgeliefert werden. Daher nur 4 Sterne

malawidortmund - German

Hatte ihn auch im Einsatz ! TOP einfaches handling 👍🏼

fishrimps9 - Spanish

se me rompio mi calentdor interno y ahora gracias a este, queda mejor el acuario y me aseguro que el agua sale ya caliente desde el fltro mejorando la temperatura

discus_my_passion_ - Polish

Super produkt ! :)

R. van der Velden - Dutch

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