JBL ProTemp S 100
Heating for aquariums, 100 W safety heater-stat with protective basket

  • Heating for an optimal temperature in aquariums with 50 to 160 l content (60 – 100 cm length)
  • Easy to install: insert the heater into the protective basket, preselect the temperature on the dial, immerse in the aquarium, attach with suction cups to the internal aquarium pane
  • Precise temperature setting: dial covers temperature range 20 - 34 °C, control accuracy +/-0.5°C. Ideal temperature transfer: star-shaped heating element, made of ceramic
  • TÜV tested, watertight to a depth of 100 cm, unbreakable safety quartz glass with protective basket. Automatic switch-off in case of sinking water level
  • Package contents: safety heater-stat with protective basket, ProTemp S100, 100 W, 4 year warranty
Find out more
Recommended retail price incl. VAT
Available from your specialist dealer.
Dealer close to you
You can find this article at your specialist shop and online
Product information

Heating for aquarium fish
Fish adapt to the ambient temperature. The life functions of cold-blooded animals sink with falling temperatures. The right aquarium temperature is therefore very important to ensure their problem-free food intake and a smooth functioning of their metabolism. Depending on the origin of the fish, the temperature they feel comfortable at varies.

Easy to install
Put the heater into the protective basket included. Preselect the required temperature using the temperature dial and immerse the heater in the water at least to the “min. water level“ line. Fasten with the suction cups. A control lamp lights up as soon as the heater is connected to the power supply. The heater can also be mounted horizontally, e.g. for turtle tanks.

Ideal temperature transfer
JBL’s safety heater thermostat ensures an ideal temperature transfer in the range between 20 - 34 °C. With the help of the dial a control accuracy of +/- 0.5 °C is ensured. The maximum attainable temperature depends on the water volume and the difference in temperature to the surroundings.

Safety heater thermostat
The protective basket in which the heater is embedded prevents the fish from being scorched. The heater is watertight, can be immersed to a depth of 100 cm and, with its 2 mm strong safety quartz glass, is very stable. If the water level sinks or the heater is removed from the water, a safety protection device in the heater interrupts the electric current and prevents overheating. The heater is TÜV certified.


JBL ProTemp S 100W

Art. no.:
EAN Code:
27,5 cm
50-160 l
Volume packaging:
1.800 l
Gross weight:
436.000 g
Net weight:
332 g
Weight factor:
50/385/95 mm

Technical Data

When I touch the heating cable under water, it is only warm.

It is by all means correct that the JBL ProTemp S heating element only emits what is perceived to be pleasant warmth by the hand. The surrounding water causes the heat to be conducted away very quickly and passed on to the water. Therefore, the heating element is functioning properly. If it is taken out of the water, the glass immediately becomes very hot. The safety shut off is activated immediately. Nevertheless, the resulting heat must escape outside the water after the heating is switched off, which may cause the heater guard to become deformed, as there is no water to cool it. The safety thermoswitch in JBL ProTemp S heaters is by no means intended as an automatic control device which makes it unnecessary to pull the plug before a water change and, instead, is merely an additional safety precaution against accidents involving electricity. Due to its design, the heater may become very hot before the thermoswitch turns it off.

Is it possible that there is a series of JBL ProTemp S heaters with in/out intervals that are not adjusted properly?

According to technical specifications, our heaters have a control accuracy of +/- 05 °C. Taking measuring errors in temperature measurement for aquarium operation into account, the switching accuracy should be approx. 1 to max. 1.5 °C. If a heater has deviations of 5-7 °C, there is usually only one possible cause.

The heater is not adjusted properly, which can be determined by checking whether the heater has or has not a push button for readjusting (JBL has several different series). Otherwise it is defective. The heater is mounted in a spot that does not have sufficient flow of water.

Deformations have occurred on the protective baskets of the ProTemp S heater. What is the reason and what can I do about it ?

The protective baskets protect the ornamental fish against burns from the heating element.

If the heater is in operation it gives off heat to the surrounding water. With calcareous water scale (precipitation of calcium carbonate) can form where the glass meets the water and this reduces the thermal dissipation. An excessive formation of scale may cause heat accumulation which can lead to overheating and a deformation of the protective baskets.

With hard tap water a regular decalcification of the heating elements e.g. with JBL Clean A or JBL pH Minus is recommended.

Does the thermostatic switch in the JBL ProTemp S heater mean it is no longer necessary to disconnect the mains by pulling out the mains plug before a water change ?

The thermostatic switch in the JBL ProTemp S heater does not mean that it is no longer necessary to disconnect the mains by pulling out the mains plug before a water change. It is just an additional safety precaution against accidents with electricity. Due to its construction the heater can get very hot before the security switch switches off. This may cause a deformation of the protective basket.

Is the basket available as a spare part, or do I need to buy a new heater?

The protective baskets are available as individual parts. You need the following to fully replace the basket, e.g. for the ProTemp S 200 W:

1 x 6043100 - End part
1 x 6043200 - Short middle part
1 x 6043300 - Long middle part with a suction cup
1 x 6043400 - Upper part with 2 suction cups

Any one of our retailers should be able to order these in case they do not have them in stock.

Blog – Opinions & Experiences


Outline: Fertilisation in the Aquarium

The JBL plant care concept leads to vigorous and healthy growth even with the most demanding aquatic plants. JBL has all the components you need, whether it’s a fertiliser, a bottom substrate or a fully automatic CO2 fertiliser system.

Find out more


What is an Aqua-terrarium / Paludarium?

You’ve seen them in zoos. They are a combination of conventional terrariums and aquariums. On top there’s a rainforest, below there’s an aquarium.

Find out more


The Rainforest Terrarium Part 3 - Heating

Unlike in other original habitats of our terrarium animals the rainforest is characterized by its even temperatures.

Find out more


Now even more safety with the free JBL GarantiePlus

Buyers of JBL technical products can rest even more on the safe side now because JBL is offering them a guarantee claim for two additional years free of charge. Just register your product online within the 2-year manufacturer guarantee ...

Find out more


Warming - Heating - Cooking

Water heaters make sense, at least, if the desired water temperature should be above room temperature. Most tropical ornamental fish feel comfortable in a water temperature between 24 and 26°C. Many shrimp species stem from ...

Find out more
Laboratories and calculators

Online Hospital

Do you have ill fish and you don’t know what disease it is and how to treat it? Here you can diagnose diseases using photos or identification keys and you can find out where they come from and how to treat them. By showing you over 500 photos to identify and cure fish diseases, we enable you to find a diagnosis and solution.

Water Analysis Online Laboratory

Enter your water parameters and get an in-depth analysis of your values in a matter of seconds. You enter your water values – and we analyse! Here you have the opportunity to enter the measured water values directly into the JBL Online Laboratory. This will analyse your values and explain and submit corrective measures.
Worth reading

Setting up an aquarium

Here you will learn how to set up your aquarium. In the film we show you the step-by-step instructions. The brochure “Setting up an aquarium” contains all information you need when setting up a new aquarium.

Setting up a saltwater aquarium

You will find ideas and help for all questions related to your aquarium here, no matter if it’s about fish diseases, water analysis or how to set up an aquarium. You will also find the latest trends and activities which could be important for you.

Optimising water values

Having the correct water values guarantees you a functioning and beautiful marine aquarium. We’ll show you how to get them.


Turtles and tortoises are among the most popular of all terrarium animals and are despite (or even because of) their slowness absolute favourites for children too! A few points need to be remembered when keeping turtles, so that the animals feel comfortable, stay healthy and maybe even reproduce. We will give you tips and hints for their care.


With the guarantee extension JBL GarantiePlus you secure your extra-long extended 4-year guarantee from the date of purchase for your JBL product. Do not miss out on your extended guarantee claim!


safety instructions

  • safety instruction for technical devices
    18 kByte
spare parts