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Shop/ Fish Supplies/ Fish Tank Supplies/ Aquarium Heaters   Aquarium Heaters An aquarist keeping tropical fish requires a thermostat heater to achieve an exact temperature and to ensure it is maintained for a healthy, happy fish tank. A range of internal heaters are available, in a variety of sizes, from the leading manufacturers such as Rena, Fluval and Interpet. All products are available online in the UK at guaranteed lowest prices with rapid UK delivery.     Tronic Heater 50W A-760 50w/240v submersible aquarium heater recommended for up to 50 litre (10 Gallon) aquariums. More Info   Rena Smart Heater 50w Do you want the peace of mind that comes from owning a smart heater? More Info     Rena Smart Heater 300w Do you want the peace of mind that comes from owning a smart heater? More Info   Rena Smart Heater 200w Do you want the peace of mind that comes from owning a smart heater? More Info     Rena Smart Heater 150w Do you want the peace of mind that comes from owning a smart heater? More Info   Rena Smart Heater 100w Do you want the peace of mind that comes from owning a smart heater? More Info     Marina 25w Heater If you want to upgrade your 21 litre Marina Aquarium to a tropical tank, this Marina 25w Heater is what you need. More Info   Marina 17w Heater If you want to upgrade your 14 litre Marina Aquarium to a tropical tank, this Marina 17w Heater is what you need. More Info     Juwel Automatic Heater The convenient compact design of this heater means it will fit neatly into your juwel filter system More Info   Interpet Deltatherm Heater 25w to 100w The premium aquarium heater on the market for your tropical fish tank More Info     Interpet Deltatherm Heater 150w to 300w The premium aquarium heater on the market for your tropical fish tank More Info   Fluval Edge 25w Heater If you want to upgrade your Fluval Edge Aquarium to a tropical tank, this Fluval Edge 25w Heater is what you need. More Info     Fluval E 50w Advanced Electronic Heater Fluval “E” Series Heaters are simply the most technologically advanced heaters available today. More Info   Floating Thermometer with sucker 11201 Protect your fish from unsafe temperatures by using this easy-to-read thermometer. More Info     Dolphin Digital Thermometer 11226 Easy-to-read digital horizontal thermometer, which mounts easily on aquarium glass. More Info