EHEIM thermocontrol e and +e Wi-Fi aquarium heater

Name: EHEIM thermocontrol e and +e aquarium heaters, 25 to 400 W
Brand: EHEIM
SKU: H3631010
Availability: InStock

The summary

What it is: a submersible aquarium heater with an electronic thermostat accurate to 0.5 °C.
What power to choose: from 25 W for 20 litres to 400 W for 1,200 litres.
With or without Wi-Fi: the thermocontrol+ e can be set and alerts you from your phone.
Its safety: dry-run protection on both ranges.

A submersible heater with electronic control, with or without Wi-Fi control

The EHEIM thermocontrol e are aquarium heaters that are fully submerged in the water and hold the temperature with an electronic thermostat, to within 0.5 °C. They come in ten power ratings, from 25 to 400 W, for a tank of 20 to 1,200 litres. The thermocontrol+ e range adds Wi-Fi control: you set the target temperature from your phone, and an email warns you when the water drifts away from it.

🌡️ Electronic regulation

A probe measures the water temperature around the heater, and the electronics switch the heating off or on again to hold your set temperature, adjusted from 20 to 32 °C using the dial. A red light comes on while heating, then turns green once the temperature is reached. The tube is coated in laboratory glass, which enlarges the heating surface and spreads the heat. A dry-run protection feature, Thermo Safety Control, switches the unit off if it ends up out of the water. The cable is approximately 1.70 m long, and the double suction-cup bracket supplied fixes it to the glass.

Small tub

The 25 W and 50 W models are enough for up to 60 litres.

Medium tank

The 75 and 100 W models heat from 60 to 150 litres.

Large tank

The 125 to 200 W models cover from 125 to 400 litres.

Very large tank

The 250 to 400 W models heat up to 1,200 litres.

Unplug and leave to cool in the water

Before putting your hand in the tank or lowering the level for a water change, unplug the heater, as you would all electrical equipment in the aquarium. Then leave it in the water for at least 30 minutes before taking it out, because the tube stays scalding hot after heating. If you have taken it out by mistake while it was running, do not put it back in: unplug it and let it cool for at least 1 hour on a surface that can withstand heat. The dry-run protection cuts the heating when the unit is out of the water, but it does not replace any of these precautions.

📶 The thermocontrol+ e with Wi-Fi

The thermocontrol+ e can be set from a smartphone, tablet or computer, via your home Wi-Fi, from 18 to 32 °C. It sends you an email when the temperature drifts 2 °C from the setting, which flags a fault or a cold snap before your fish suffer from it. It can also be synchronised with an EHEIM professionel 5e filter or an LEDcontrol+ light from the same connected range. It comes in 150, 200, 250 and 300 W, for a tank of 200 to 1,000 litres. Submerge it up to the water-level mark, and no further, to ensure good Wi-Fi reception.

A thermometer opposite the heater

A suction-cup aquarium thermometer stuck on the opposite side of the tank shows you the temperature where your fish actually live, far from the heater's sensor. That way you can check at a glance that the whole volume has reached the set temperature, especially during the first cold nights.

🔧 Fitting it in the tank

Attach the heater to the glass with its double suction-cup bracket, always vertically, in an area where the filter current is strong: the heated water is then distributed throughout the tank instead of staying around the tube. Before plugging it in, check that the glass shows no cracks and submerge it at least to its minimum water level mark. Let the cable hang in a loop lower than the socket, so that a drop running down the cable falls to the floor rather than reaching the socket. Finally, protect your aquarium equipment with a 30 mA residual current device, and keep the water below 35 °C, the heater's operating limit.

🌱 In aquaponics

In a small indoor aquaponics system, temperature governs the fish's appetite and the activity of the bacteria that convert their waste into nitrates for the plants, as explained in the article on the nitrogen cycle. Stable water at 24 to 26 °C keeps these bacteria active all winter. Tilapia and tropical species need this all year round. Place the heater in the fish tank, near the water return, so that the current distributes the heat. With a thermocontrol+ e, the email alert also warns you if the pump stops.

Technical specifications

thermocontrol e

Power ratings: 25 to 400 W
Tank volume: 20 to 1,200 L depending on output
Adjustment: 20 to 32 °C, set with the dial ring
Dimensions: 36 mm in diameter, 23 to 50 cm high

thermocontrol+ e Wi-Fi

Power ratings: 150, 200, 250 or 300 W
Tank volume: 200 to 1,000 L depending on output
Adjustment: 18 to 32 °C, controlled from your phone
Alert: Email at 2 °C differenceCan be synchronised with a professional filter 5e

Both ranges

Precision: 0.5 °C
Safety: Cut-off in case of dry running
Cable: About 1.70 m
Water: Freshwater and marine

Warranty and mounting

Warranty: 3 years
Fixing: Double suction-cup bracket supplied

6 further specifications are available in the detailed view.

In the box

1 EHEIM thermocontrol e or thermocontrol+ e heater of the chosen power
1 double suction-cup holder
1 instruction leaflet

Power ratings, volumes, adjustment ranges, accuracy, dimensions, cable and warranty recorded on 11/10/2026 from the EHEIM thermocontrol e and thermocontrol+ e product pages.

With or without Wi-Fi?

Two ranges of EHEIM heaters with electronic control.

Which range? Answer three questions, and the table highlights the heater that suits you.

	Power ratings	Tank volume	Adjustment	Email alert	Syncs with the EHEIM connected range	Price
Recommended EHEIM thermocontrol e and +e aquariumYour choice	25 to 400 W	20 to 1,200 L	Dial, from 20 to 32 °C	No	No	Dhs. 135.00
thermocontrol+ e Wi-FiYour choice	150 to 300 W	200 to 1,000 L	Wi-Fi, from 18 to 32 °C	Yes	Yes	Dhs. 223.00

EHEIM thermocontrol e and +e aquariumRecommended

Power and adjustment

Power ratings25 to 400 W

Tank volume20 to 1,200 L

AdjustmentDial, from 20 to 32 °C

Email alertNo

Syncs with the EHEIM connected rangeNo

thermocontrol+ e Wi-Fi

Power and adjustment

Power ratings150 to 300 W

Tank volume200 to 1,000 L

AdjustmentWi-Fi, from 18 to 32 °C

Email alertYes

Syncs with the EHEIM connected rangeYes

Values taken on 11/10/2026 from the EHEIM product pages. Prices compared on the 150 W model.

Documents & manuals

Instructions for the thermocontrol+ e

Multilingual instructions including French: vertical mounting, Wi-Fi connection, indicator lights and a 30-minute cooling period before taking the unit out.

PDF · 14,6 Mo

Download

Software manual for the thermocontrol+ e

The setting screens in French: set temperature, e-mail alert and link to the other connected EHEIM devices.

PDF · 2,2 Mo

Download

Estimate your
delivery time

Delivered to your home by Colissimo or Chronopost, as you prefer at checkout. The exact cost is shown in the basket, according to the total weight of your order.

Frequently asked questions

8 questions

6 key questions, 8 in the detailed view

What power do I need for my aquarium?

Tank volume	thermocontrol e
20 to 60 L	25 or 50 W
60 to 150 L	75 or 100 W
150 to 300 L	125 or 150 W
300 to 600 L	200 or 250 W
600 to 1,200 L	300 or 400 W

In a cool room, choose the next power rating up.

thermocontrol e or thermocontrol+ e?

What is the difference from the thermocontrol without the e?

How does the thermocontrol+ e warn you of a problem?

What does the indicator light mean?

On the thermocontrol e, the indicator light glows red while heating and turns green when the target temperature is reached.

On the thermocontrol+ e, the red indicator lamp lights up while heating and goes out otherwise, while the status LED shows the connection: flashing white while searching for the network, blue when the heater creates its own network, green when it is linked to another connected EHEIM device.

Where to place it in the tank?

Is it suitable for seawater?

What warranty?

Let us talk about your project

A question about this product or your setup? Our team will answer and advise you.

Email us Contact form

Interest-free instalment payments

Offered depending on the cart amount, at checkout.

Delivery in 2 to 15 working days

Depending on the products and shipping sites. Estimate by destination in the estimator on this page.

After-sales service 7 days a week by email or chat

Our team answers all your questions.

Shop responsibly

Become part of the change.

🎁 Choose your free gift

EHEIM thermocontrol e and +e aquarium heaters, 25 to 400 W

The summary