Best Aquarium Heaters Deals Online in the UK (25 Deals Found)

Last Updated - 07/07/2026 Sort By:

Best Choice
PYPABL

New
PYPABL 25W 50W 100W 200W 300W Aquarium Heater, Submersible Glass Heater for 10L-300Litres Fish and Turtle Tank (25W for
【Specification】25W water heater, 20*2.5*2.5 cm, suitable for 10L-30L tank, also suitable for freshwater and saltwater.

£10.97
Fluval

New
Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal.
300-Watt heater designed for freshwater aquariums up to 80 Gal (300 L) with advanced electronic construction provides su

£25.49
New
Hepo Aquarium Heater Fish Tank Quartz Submersible Thermostat HP-608 25w to 500w
The Hepo HP-608 range of quartz aquarium heaters are ideal for aquariums up to 25-500 litres in size. The 500w model is

£15.99
HITOP

New
HITOP HP-608 Submersible Aquarium Heater 25W 50W With Thermometer and Extra Sucker Cup (50W)
🐟 Thickened Glass: 2mm thickened quartz glass, 33% thicker than 1.5mm normal aquarium heaters, much safer for human and

£12.97
New
Hidom Submersible Tropical Fish Tank Aquarium Heater & Thermostat (7 Sizes)
These quality heaters are easy to adjust, and will regulate the temperature in your aquarium. Ideal for Tropical / Marin

£13.95
Best Value
Interpet

New
Interpet Deltatherm Aquarium Fish Tank Heater, adjustable, for Tropical and Marine, 300 W, for aquariums up to 270 litre
Precise and reliable heating control for tropical aquariums, freshwater and marine

£19.99
HITOP

New
HITOP HP-608 Submersible Aquarium Heater 25W 50W With Thermometer and Extra Sucker Cup
HITOP aquarium heater 25W, length 18cm, power cord 1.8m, designed for small fish tanks, recommended for aquariums 8-30L.

£11.97
New
Aquarium Heater Submersible Preset Heater For Tropical Aquariums Compact Heater
The preset heater is set to 25 degrees, appropriate for most tropical fish, shrimp and aquatic plants. Whether you're a

£13.99
QZQ

New
QZQ Fish Tank Heater Submersible Aquarium Heater Features LED External Thermostat 50W/75W/100W/150W Power Options Suitab
𝐄𝐱𝐭𝐞𝐫𝐧𝐚𝐥 𝐋𝐄𝐃 𝐓𝐞𝐦𝐩𝐞𝐫𝐚𝐭𝐮𝐫𝐞 𝐂𝐨𝐧𝐭𝐫𝐨𝐥𝐥𝐞𝐫: The external temperature controller for fish tank h

£15.99 £16.89
New
Hidom ProHeat Quartz Aquarium Heater Submersible Fish Tank Thermostat 25 to 500w
The Hidom ProHeat HT-8 Series Quartz Glass Aquarium Heater has been designed and manufactured by industry veterans and w

£11.45
Neulriscn

New
Neulriscn Aquarium Heater, 500W Fish Tank Heater with External Temperature Controller, Submersible Fish Tank Heaters wit
【500W Aquarium Heater】The 500W fish tank heater can be applicable to 300-450L tank. It is 11.02 inches in length, 4.92ft

£21.99
HITOP

New
HITOP HP-608 100W Submersible and Adjustable Aquarium Heater With Thermometer and Suction Cups
Thickened Glass: 2mm thickened quartz glass, 33% thicker than 1.5mm normal aquarium heaters, much safer for your lovely

£13.27 £13.97
New
Interpet EU Deltatherm Aquarium Heater Fish Tank Heating 2 Pin Plug Submersible
Interpet Deltatherm Aquarium Heater -EU Plug. Interpet Nano Aquarium Fish Tank Heater Delta Mini 15w Preset Flexible Fla

£7.95
10% Off
GlowUp

New
GlowUp Aquarium Heater 300W,Fish Tank Heater with External Controller,LED Display, Overheat & Dry-Run Protection, Heater
Durable & Easy-Maintainance Material:Made of explosion-proof quartz glass for efficient and even heat distribution,keepi

£18.99 £20.99
New
Aquarium Water Heater Aqua Fish Tank Thermosafe LCD Digital Submersible 50-200W
With dual heating wires, it ensures uniform and stable heating, energy efficiency, and a long lifespan. Feature: 1. Mode

£12.59
HiTauing

New
HiTauing Aquarium Heater, 50W/100W/300W/500W Submersible Fish Tank Heater with Over-Temperature Protection and Automatic
🐠【Rapid Heating and Two Temperature Control System】50W aquarium heater is sutable for 20L-50 Litres water fish tank and

£19.99
New
Hepo Submersible Aquarium Fish Tank Tropical Heater Thermostat HP-605 25 to 300w
These quality heaters are easy to adjust, and will regulate the temperature in your aquarium. HP-605 (300w). Ideal for T

£9.99
New
Fluval T Aquarium Heater Electronic Accurate 50 - 300L Submersible Fish Tank
Suitable for Aquariums Up to: 300L. Available in five sizes, these heaters cater to a wide range of aquarium capacities,

£22.49
New
Aquarium Heater 500W Submersible Fish Tank Heater with External Digital Control
🐠【500W Fast Heating】Our 500W Aquarium Heater is made of high quality quartz tubes and high temperature resistant nickel

£22.99
New
Hidom Aquarium Heater Submersible Fish Tank 25-300w Tropical with Thermometer
Aquarium Heater – Multiple Sizes (25W–300W). 25W • 50W • 75W • 100W • 150W • 200W • 300W. 300W 250–300L. Indicator Light

£9.65
New
Hidom Submersible Tropical Fish Tank Aquarium Heater & Thermostat + Thermometer
These quality heaters are easy to adjust, and will regulate the temperature in your aquarium. Ideal for Tropical / Marin

£12.95
New
USB Mini Aquarium Fish Tank Heater Thermostat Submersible Heater LED Heating Rod
1 Piece Fish Tank Heater Rod. -Mini size, saving space in the fish tank and is more beautiful. -USB heating rod, the tem

£8.95
New
Swell 100w Aquarium Fish Tank Heater Submersible Thermostat for Tropical Tank
This Swell Heater 100W is easy to install. Once you plug it in, the heater's 'on' light will turn on. What is this Swell

£10.99
New
Hidom ProHeat Quartz Aquarium Heater Submersible Fish Tank Thermostat 25 to 500w
The Hidom ProHeat HT-8 Series Quartz Glass Aquarium Heater has been designed and manufactured by industry veterans and w

£18.45
New
External Heater Thermostat for Aquarium Fish Tank Canister Filter 300w and 500w
This heater can ONLY be connected to an external canister filter outlet pipe, so water is pumped through the heater from

£34.99

25 Aquarium Heaters deals are available from: Amazon, eBay stores, starting from £7.95.
The biggest discount we found is 10% on GlowUp Aquarium Heater 300W,Fish Tank Heater with External Controller,LED Display, Overheat & Dry-Run Protection, Heater for Aquarium Fish Tank Tropical Fresh & Salt Water 150-350 L at Amazon.
The lowest price we found is £7.95 while the highest is £34.99.
Prices for the best Aquarium Heaters deals average at £15.96.
Last updated on July 7, 2026.
We scanned these quality online stores and more to deliver you with the best offers online available for Aquarium Heaters.