Aquarium Systems VisiTherm Submersible Heater 25w-300w

10 reviews

Aquarium Systems VisiTherm Submersible Heaters are available at the best price from Swell UK, to allow the quick and accurate heating of your aquarium water to the right temperatures, to support the aquatic life inside your tank. Best used with tropical tanks that need a little temperature boost.


  • Visitherm 25w 10% OFF With Code
    code: 210519 In Stock (Only 3 left!)
  • Visitherm 50w 10% OFF With Code
    code: 210520 In Stock (10+ Available)
  • Visitherm 100w 10% OFF With Code
    code: 210521 In Stock (Only 4 left!)
  • Visitherm 150w 10% OFF With Code
    code: 210522 In Stock (Only 7 left!)
  • Visitherm 200w 10% OFF With Code
    code: 210523 In Stock (Only 2 left!)
  • Visitherm 300w 10% OFF With Code
    code: 210525 In Stock (Only 1 left!)

Product Information

Designed for use in fresh and salt water aquariums and for amphibians such as a frogs or turtles. The Aquarium Systems VisiTherm heater is a versatile and efficient addition to your set up. The heater has recently been redesigned with practicality and proficiency as a priority. The heating elements have been improved to a high standard and double encased in a quartz sleeve.

The double insulated casing allows for complete submersion of the sleeve, and this coupled with sensitive heating elements, provide and sustain the correct temperature for your tank. An easy to read thermometer style gauge means you can monitor the temperature without disturbing aquatic life.

A convenient control knob sits atop the unit meaning that you can set the heater at the desired temperature easily and quickly.

Available for the smallest and largest aquariums, from 20 litres to 300. Please see the product specification for details on the correct VisiTherm heater for your tank.

As always, should you need any advice or further information please contact our sales team on 0161 351 4700.

Key Features:

  • Suitable for use with fresh, salt water and amphibian aquariums.
  • Improved design increasing accuracy and efficiency.
  • Easy to use; simply submerge and turn the control knob to set temperature.
  • Visible thermometer style indicator.
  • On/off light indicator.
  • Shock resistant, durable quartz sleeve.
  • Suction cups and support clips included.
  • Amazing 5 years guarantee.

SizeAquarium SizeWattage
Aquarium Systems Visitherm 25w 22cm 20-30ltr 25w
Aquarium Systems Visitherm 50w 27cm 30-50ltr 50w
Aquarium Systems Visitherm 100w 27cm 100-150ltr 100w
Aquarium Systems Visitherm 150w 31.5cm 150-200ltr 150w
Aquarium Systems Visitherm 200w 31.5cm 200-300ltr 200w
Aquarium Systems Visitherm 300w35.5cm 300ltr 300w

Latest Customer Reviews

  • Rating
    Date 14/10/2021 08:10am
    Aquarium Systems Visitherm 100w
    Feefo Logo
    Does what I needed it to.
  • Rating
    Date 17/03/2021 14:03pm
    Aquarium Systems Visitherm 200w
    Feefo Logo
    Heater works as described but actual temperature doesn't match predicted scale
  • Rating
    Date 29/11/2020 09:11am
    Aquarium Systems Visitherm 100w
    Feefo Logo
    Excellent product, well wrapped and fast delivery
  • Rating
    Date 07/09/2020 08:09am
    Aquarium Systems Visitherm 200w
    Feefo Logo
    Quality product does what it states
  • Rating
    Date 04/08/2020 08:08am
    Aquarium Systems Visitherm 200w
    Feefo Logo
    Works OK ............................
  • Rating
    Date 18/06/2020 09:06am
    Aquarium Systems Visitherm 300w
    Feefo Logo
    have another of these easy to read and set
  • Rating
    Date 27/05/2020 01:05am
    Aquarium Systems Visitherm 25w
    Feefo Logo
    GreatšŸ˜Šthis product is absolutely perfect
  • Rating
    Date 09/02/2020 08:02am
    Aquarium Systems Visitherm 200w
    Feefo Logo
    Have used these before with no problems easy set and temp display
  • Rating
    Date 14/12/2019 20:12pm
    Aquarium Systems Visitherm 100w
    Feefo Logo
    Having tried many different brands of heaters. I have found Visitherm to be the very best by some distance.
  • Rating
    Date 14/09/2019 05:09am
    Aquarium Systems Visitherm 300w
    Feefo Logo
    Tried and tested in my aquariums and proved reliable.