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Household Pumps

A huge range of pumps for household, commercial, agricultural and industrial use

Floating Fountains & Dam Aerators

Floating Fountains and Aerators for Dams, Lakes and Large Ponds

Pond Help & Information

Need a hand working out the right gear for your project? Browse our range of help pages or submit a help request directly to our specialists.

Hydor Theo Glass Aquarium Heaters

Hydor's Theo range are very high quality aquarium heaters. Made from hygienic shatter proof glass, these efficient heaters are tried and tested.

  • Available in sizes ranging from 15w to 300w
  • Shatter resistant glass
  • Can be mounted at any angle
  • No problems with thermal shock from going in and out of colder or warmer water
  • 100% submersible and waterproof
  • Compact and attractive design for minimal tank intrusion
  • Italian brand, not a cheap knock off
  • MINI 15w aquarium heater also available (not glass) - suits smaller aquariums (2.5 degree increase for 20L aquarium, 2 degree increase for 40L)


Aussie's Observations about  Theo Glass Aquarium Heaters

Budget • Good • Better • Best • Superior

Aquariums up to 300L that need heating! Perfect for tropical fish in colder climates

High quality and minimal returns

Nothing at all

Product Price
Hydor Theo Aquarium Heater 100w Internal Aquarium Heater
$29.98 $59.95
Hydor Theo Aquarium Heater 50w Internal Aquarium Heater
$24.98 $49.95
Hydor Theo Aquarium Heater 25w Internal Aquarium Heater
$19.98 $39.95
Hydor Mini Aquarium Heater Internal Aquarium Heater
$15.00 $30.00
Hydor Theo Aquarium Heater 150w Internal Aquarium Heater
$34.98 $69.95
Hydor Theo Aquarium Heater 300w Internal Aquarium Heater
$44.99 $89.98
Hydor Theo Aquarium Heater 200w Internal Aquarium Heater
$39.98 $79.95