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External Fish Tank Heater

Brand
  • Fluval
    Fluval
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    Interpet
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    EHEIM
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    Juwel
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    Marina
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    Tétra
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    biOrb
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    Hydor
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    Superfish
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    Aquanova
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    Aqua Medic

Top-rated

See all
  • Hidom HT-8500 500W Submersible Aquarium Thermostat Heater

    Hidom HT-8500 500W Submersible Aquarium Thermostat Heater

    (34)
    100% agree - Would recommend
    £18.45 New
  • Hidom HT-2025 Submersible Thermostat Heater for Aquariums - Black

    Hidom HT-2025 Submersible Thermostat Heater for Aquariums - Black

    (31)
    96% agree - Would recommend
    £9.65 New
  • Hobby Universal Twin Heater Holder Aquarium Fish Tank

    Hobby Universal Twin Heater Holder Aquarium Fish Tank

    (31)
    100% agree - Would recommend
    £4.95 New
  • Superfish 2 in 1 Digital Smart 55w Aquarium Heater Thermometer Fish Tank Mini

    Superfish 2 in 1 Digital Smart 55w Aquarium Heater Thermometer Fish Tank Mini

    (26)
    90% agree - Would recommend
    £18.99 New
  • EHEIM 3619110 300W Aquarium Thermostat Heater

    EHEIM 3619110 300W Aquarium Thermostat Heater

    (24)
    88% agree - Would recommend
    £27.99 New
    £21.48 Used
  • Hidom HT-8100 100W Aquarium Heater

    Hidom HT-8100 100W Aquarium Heater

    (23)
    100% agree - Would recommend
    £12.95 New
  • D-D Dual Temperature Controller

    D-D Dual Temperature Controller

    (16)
    100% agree - Would recommend
    £42.29 New
    £31.88 Used
  • Interpet 51528 10W Nano Stat Submersible Heater for Aquariums

    Interpet 51528 10W Nano Stat Submersible Heater for Aquariums

    (14)
    100% agree - Would recommend
    £8.50 New

Best selling

See all
  • Hidom HT-2025 Submersible Thermostat Heater for Aquariums - Black

    Hidom HT-2025 Submersible Thermostat Heater for Aquariums - Black

    (31)
    £9.65 New
  • Fluval T Series Aquarium Heater 300w Fish Tank Accurate Thermostat 300 Litres

    Fluval T Series Aquarium Heater 300w Fish Tank Accurate Thermostat 300 Litres

    (2)
    £27.99 New
  • biOrb 50W Watt Heater for Tropical Aquarium Fish Tank

    biOrb 50W Watt Heater for Tropical Aquarium Fish Tank

    (19)
    £21.50 New
  • Dungeons & Dragons Ocean Breeze Cooling Fan - Black

    Dungeons & Dragons Ocean Breeze Cooling Fan - Black

    (2)
    £15.25 New
  • Hidom HT-8500 500W Submersible Aquarium Thermostat Heater

    Hidom HT-8500 500W Submersible Aquarium Thermostat Heater

    (34)
    £18.45 New
  • Fluval T200 Fully Electronic Heater

    Fluval T200 Fully Electronic Heater

    (2)
    £27.49 New
  • Fluval T100 100W Fully Electronic Aquarium Heater - 14881

    Fluval T100 100W Fully Electronic Aquarium Heater - 14881

    (2)
    £26.79 New
  • Fluval E A773 Advanced Electronic Heater, 200 W

    Fluval E A773 Advanced Electronic Heater, 200 W

    (29)
    £42.49 New

More to explore

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  • Marine Fish Tank Heater
  • Stainless Steel Aquarium Heater
  • Submersible Water Heater
  • Tank Thermostat in Aquarium Heaters & Chillers
  • Tropical Fish Tank Heater
  • Visitherm Heater

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  • External Fish Tank Heater

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64 results

Sort: Best match

  • Best match
  • Time: ending soonest
  • Time: newly listed
  • Price + postage: lowest first
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  • Distance: nearest first

    • Inline Aquarium Heater External Filter Thermostat Fish Tank Digital 300W 500W - Image 1 of 4
    • Inline Aquarium Heater External Filter Thermostat Fish Tank Digital 300W 500W - Image 2 of 4
    • Inline Aquarium Heater External Filter Thermostat Fish Tank Digital 300W 500W - Image 3 of 4
    • Inline Aquarium Heater External Filter Thermostat Fish Tank Digital 300W 500W - Image 4 of 4

    Inline Aquarium Heater External Filter Thermostat Fish Tank Digital 300W 500W

    Brand new · Unbranded
    £33.98
    Free postage
    Click & Collect
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    • AQQA Aquarium Heater,50w Fish Tank Heater with 59-93°F External Controller… - Image 1 of 4
    • AQQA Aquarium Heater,50w Fish Tank Heater with 59-93°F External Controller… - Image 2 of 4
    • AQQA Aquarium Heater,50w Fish Tank Heater with 59-93°F External Controller… - Image 3 of 4
    • AQQA Aquarium Heater,50w Fish Tank Heater with 59-93°F External Controller… - Image 4 of 4

    AQQA Aquarium Heater,50w Fish Tank Heater with 59-93°F External Controller…

    Brand new
    £29.99
    Free postage
    Click & Collect
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    • Aquael Flow Inline Heater External Filter Thermostat Aquarium Fish Tank - Image 1 of 4
    • Aquael Flow Inline Heater External Filter Thermostat Aquarium Fish Tank - Image 2 of 4
    • Aquael Flow Inline Heater External Filter Thermostat Aquarium Fish Tank - Image 3 of 4
    • Aquael Flow Inline Heater External Filter Thermostat Aquarium Fish Tank - Image 4 of 4

    Aquael Flow Inline Heater External Filter Thermostat Aquarium Fish Tank

    Brand new
    £54.95 to £62.95
    Free postage
    Click & Collect
    99 sold
    5⁣S⁣V⁣p⁣ ⁣o⁣O⁣G⁣ ⁣n⁣ѕ⁣o⁣r⁣e⁣d⁣T⁣9⁣ ⁣E⁣⁣T⁣ ⁣⁣P⁣4⁣⁣⁣⁣
    • Inline Aquarium Heater External Filter Thermostat Fish Tank Digital 300W 500W - Image 1 of 4
    • Inline Aquarium Heater External Filter Thermostat Fish Tank Digital 300W 500W - Image 2 of 4
    • Inline Aquarium Heater External Filter Thermostat Fish Tank Digital 300W 500W - Image 3 of 4
    • Inline Aquarium Heater External Filter Thermostat Fish Tank Digital 300W 500W - Image 4 of 4

    Inline Aquarium Heater External Filter Thermostat Fish Tank Digital 300W 500W

    Brand new · Unbranded
    £33.98
    Free postage
    Click & Collect
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  • Fish Tank Heater Submersible Aquarium Heater with External Temperature BH-200 - Image 1 of 2

    Fish Tank Heater Submersible Aquarium Heater with External Temperature BH-200

    New (other)
    £8.99
    £3.50 P&P
    Click & Collect
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  • Hydor ETH External Heater In-Line 300W 16mm Aquarium Fish Tank Temperature - Image 1 of 3

    Hydor ETH External Heater In-Line 300W 16mm Aquarium Fish Tank Temperature

    Brand new · Hydor
    (8)
    £40.00
    or Best Offer
    £3.45 P&P
    Click & Collect
    6 watching
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  • Aquael Inline External Fish Tank Heater 300w 500w Thermostat Tropical Aquarium - Image 1 of 4

    Aquael Inline External Fish Tank Heater 300w 500w Thermostat Tropical Aquarium

    Brand new · Aquael
    (1)
    £54.95 to £61.95
    Free postage
    Click & Collect
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  • Aquael Inline Aquarium Heater External Filter Thermostat  Fish Tank 300w 500W - Image 1 of 1

    Aquael Inline Aquarium Heater External Filter Thermostat Fish Tank 300w 500W

    Brand new · Aquael
    (1)
    £55.25 to £61.95
    Free postage
    Click & Collect
    15 watching
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  • Hydor ETH External Heater In-Line 300W 16mm Aquarium Fish Tank Temperature - Image 1 of 2

    Hydor ETH External Heater In-Line 300W 16mm Aquarium Fish Tank Temperature

    Brand new · Hydor
    (8)
    £52.95
    Free postage
    Click & Collect
    55 sold
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  • 300W/500W External Heater Thermostat For Aquarium Fish Tank Canister Filter UK  - Image 1 of 4

    300W/500W External Heater Thermostat For Aquarium Fish Tank Canister Filter UK

    Brand new · Unbranded
    £33.98
    Free postage
    Click & Collect
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  • Fish Tank Heater, Submersible Aquarium Heater with External Temperature Contr... - Image 1 of 1

    Fish Tank Heater, Submersible Aquarium Heater with External Temperature Contr...

    Brand new
    £26.38
    Free postage
    Click & Collect
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  • External Aquarium Heaters Thermostat Inline Filter Fish Tank JBL Protemp E - Image 1 of 4

    External Aquarium Heaters Thermostat Inline Filter Fish Tank JBL Protemp E

    Brand new · JBL
    £49.95 to £56.95
    Free postage
    Click & Collect
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  • (1200W)Aquarium External Heating Rods UK Plug 220V Fish Tank External Heater - Image 1 of 4

    (1200W)Aquarium External Heating Rods UK Plug 220V Fish Tank External Heater

    Brand new · Unbranded
    £99.98
    (£99.98/kg)
    or Best Offer
    Free postage
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  • External Heater Thermostat For Aquarium Fish Tank Canister Filter 300W/500W UK - Image 1 of 4

    External Heater Thermostat For Aquarium Fish Tank Canister Filter 300W/500W UK

    Brand new · Unbranded
    £33.98
    Free postage
    Click & Collect
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  • 300W/500W Aquarium Fish Tank Digital External Filter Heater Inline Thermostat - Image 1 of 4

    300W/500W Aquarium Fish Tank Digital External Filter Heater Inline Thermostat

    Brand new · Unbranded
    £33.98
    Free postage
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  • 300W/500W External Heater Thermostat For Aquarium Fish Tank Canister Filter UK - Image 1 of 4

    300W/500W External Heater Thermostat For Aquarium Fish Tank Canister Filter UK

    Brand new · Unbranded
    £33.98
    Free postage
    Click & Collect
    S⁣B⁣p⁣C⁣о⁣ ⁣n⁣F⁣C⁣s⁣o⁣r⁣ ⁣e⁣E⁣A⁣ ⁣U⁣d⁣4⁣⁣⁣ ⁣P⁣⁣8⁣⁣⁣
  • USB Small Fish Tank Heater Small Tank Heater External Temperature Controller - Image 1 of 1

    USB Small Fish Tank Heater Small Tank Heater External Temperature Controller

    Brand new · Unbranded
    £11.28 to £11.29
    Free postage
    Q⁣⁣⁣⁣⁣S⁣ ⁣A⁣W⁣⁣ ⁣A⁣W⁣⁣ ⁣C⁣D⁣ ⁣9⁣8⁣⁣⁣ ⁣E⁣⁣ ⁣⁣⁣
  • Aquael Flow Heater 300W - 500W Aquarium Fish Tank  External Heater, Termostat - Image 1 of 4

    Aquael Flow Heater 300W - 500W Aquarium Fish Tank External Heater, Termostat

    Brand new
    £54.89
    Free postage
    Click & Collect
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  • Aquarium Heater Small Tank Heater Used for Less Than 1 gallons External - Image 1 of 1

    Aquarium Heater Small Tank Heater Used for Less Than 1 gallons External

    Brand new · Unbranded
    £10.98
    Free postage
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  • DONGKER Aquarium Heater, 100W Fish Tank Heater with External Controller (P992) - Image 1 of 4

    DONGKER Aquarium Heater, 100W Fish Tank Heater with External Controller (P992)

    New (other)
    £19.03
    £2.99 P&P
    Click & Collect
    Q⁣N⁣ ⁣⁣⁣I⁣⁣8⁣⁣ ⁣K⁣C⁣⁣⁣⁣ ⁣H⁣Q⁣ ⁣⁣3⁣⁣⁣3⁣⁣⁣⁣ ⁣
  • USB Small Fish Tank Heater External Temperature Controller Used for Less Than 1 - Image 1 of 1

    USB Small Fish Tank Heater External Temperature Controller Used for Less Than 1

    Brand new · Unbranded
    £10.43
    Was: £10.98was - £10.98
    Free postage
    ⁣⁣X⁣⁣⁣⁣O⁣ ⁣⁣⁣M⁣A⁣⁣⁣⁣⁣⁣⁣ ⁣2⁣L⁣ ⁣J⁣3⁣⁣⁣ ⁣0⁣
  • outdoormarket USB Small Fish Tank Heater Heating Tool External Temperature - Image 1 of 1

    outdoormarket USB Small Fish Tank Heater Heating Tool External Temperature

    Brand new · Unbranded
    £11.08 to £11.63
    Free postage
    ⁣⁣⁣⁣⁣⁣M⁣⁣⁣⁣V⁣⁣ ⁣⁣⁣U⁣5⁣⁣ ⁣L⁣6⁣⁣⁣⁣⁣ ⁣⁣C⁣
  • Small Fish Tank Heater External Temperature Controller Aquarium Heater for Pet - Image 1 of 1

    Small Fish Tank Heater External Temperature Controller Aquarium Heater for Pet

    Brand new · Unbranded
    £10.56
    Free postage
    ⁣3⁣L⁣ ⁣W⁣⁣H⁣ ⁣1⁣⁣⁣F⁣⁣ ⁣V⁣⁣5⁣⁣ ⁣⁣⁣⁣N⁣Z⁣⁣ ⁣⁣R⁣
  • Aquarium Heater for 1 Gallon External Temperature Controller Small Fish Tank - Image 1 of 1

    Aquarium Heater for 1 Gallon External Temperature Controller Small Fish Tank

    Brand new · Unbranded
    £11.72 to £12.05
    Free postage
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  • Aquael Flow Heater   500W Aquarium Fish Tank  External Heater, Termostat - Image 1 of 4

    Aquael Flow Heater 500W Aquarium Fish Tank External Heater, Termostat

    Brand new
    £61.95
    Free postage
    Click & Collect
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  • USB Small Fish Tank Heater Mini Tank Heater External Temperature Controller - Image 1 of 1

    USB Small Fish Tank Heater Mini Tank Heater External Temperature Controller

    Brand new · Unbranded
    £11.35 to £11.72
    Free postage
    ⁣⁣⁣⁣H⁣⁣0⁣ ⁣⁣6⁣⁣0⁣ ⁣T⁣L⁣⁣⁣⁣ ⁣L⁣⁣⁣⁣7⁣ ⁣⁣P⁣⁣
  • Aquael Flow Heater 300W - 500W Aquarium Fish Tank  External Heater, Termostat - Image 1 of 4

    Aquael Flow Heater 300W - 500W Aquarium Fish Tank External Heater, Termostat

    Brand new
    £61.00
    Free postage
    Click & Collect
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  • USB Small Fish Tank Heater External Temperature Controller Aquarium Heater for - Image 1 of 1

    USB Small Fish Tank Heater External Temperature Controller Aquarium Heater for

    Brand new · Unbranded
    £10.98 to £11.12
    Free postage
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  • 500W Aquarium Fish Tank Digital External Filter Heater Inline Water Thermostat - Image 1 of 4

    500W Aquarium Fish Tank Digital External Filter Heater Inline Water Thermostat

    Brand new · Unbranded
    £35.29
    Free postage
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  • (1200W)BROLEO Fish Tank External Heater Waterproof Professional Aquarium - Image 1 of 4

    (1200W)BROLEO Fish Tank External Heater Waterproof Professional Aquarium

    Brand new · Unbranded
    £81.53
    (£81.53/kg)
    or Best Offer
    Free postage
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  • In-Line External Aquarium Heater 150W 300W 500W Fish Tank Temperature Controller - Image 1 of 4

    In-Line External Aquarium Heater 150W 300W 500W Fish Tank Temperature Controller

    Brand new
    £63.59 to £67.19
    Free postage
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  • Fish Tank External Heating Rods Automatic Thermostat Aquarium External ~ - Image 1 of 4

    Fish Tank External Heating Rods Automatic Thermostat Aquarium External ~

    Brand new · Unbranded
    £92.88
    (£92.88/kg)
    or Best Offer
    Free postage
    Ѕ⁣p⁣V⁣o⁣W⁣n⁣s⁣ ⁣o⁣r⁣e⁣Q⁣d⁣⁣C⁣ ⁣Y⁣⁣⁣Z⁣⁣⁣⁣ ⁣⁣D⁣K⁣ ⁣
  • Mini Fish Tank Heater LED USB Heating Rod External Temperature Controller - Image 1 of 4

    Mini Fish Tank Heater LED USB Heating Rod External Temperature Controller

    Brand new · Unbranded
    £10.66
    Free postage
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  • Mini Fish Tank Heater LED USB Heating Rod External Temperature Controller LED - Image 1 of 4

    Mini Fish Tank Heater LED USB Heating Rod External Temperature Controller LED

    Brand new · Unbranded
    £10.15
    Free postage
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  • USB Small Fish Tank Heater Heating Tool External Temperature Controller - Image 1 of 2

    USB Small Fish Tank Heater Heating Tool External Temperature Controller

    Brand new · Unbranded
    £9.95 to £13.26
    Free postage
    F⁣⁣⁣⁣J⁣ ⁣2⁣4⁣ ⁣⁣⁣E⁣⁣E⁣ ⁣Y⁣E⁣⁣ ⁣⁣C⁣L⁣ ⁣⁣C⁣⁣⁣⁣
  • 10W Mini Fish Tank Heater External Temperature Controller with Built in - Image 1 of 4

    10W Mini Fish Tank Heater External Temperature Controller with Built in

    Brand new · Unbranded
    £11.09
    Free postage
    ⁣⁣3⁣⁣0⁣ ⁣Q⁣X⁣ ⁣⁣6⁣⁣Z⁣⁣⁣⁣⁣ ⁣⁣Q⁣Z⁣⁣ ⁣C⁣⁣⁣Y⁣⁣
  • 10W Mini Fish Tank Heater for 5/10/20 gallons External Temperature Controller - Image 1 of 4

    10W Mini Fish Tank Heater for 5/10/20 gallons External Temperature Controller

    Brand new · Unbranded
    £11.39
    Free postage
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  • Aquarium Heater Fish Tank Quartz Heating Rod With External Temperature Contr Ggm - Image 1 of 4

    Aquarium Heater Fish Tank Quartz Heating Rod With External Temperature Contr Ggm

    Brand new · Unbranded
    £20.51
    or Best Offer
    Free postage
    Click & Collect
    ⁣⁣R⁣R⁣⁣ ⁣5⁣⁣⁣⁣⁣N⁣⁣⁣⁣ ⁣L⁣O⁣⁣ ⁣⁣⁣⁣⁣⁣9⁣⁣8⁣
  • Fish Tank External Heating Rods AutoThermostat Aquarium External Heater 300W US✿ - Image 1 of 4

    Fish Tank External Heating Rods AutoThermostat Aquarium External Heater 300W US✿

    Brand new · Unbranded
    £83.26
    (£83.26/kg)
    or Best Offer
    Free postage
    S⁣6⁣P⁣p⁣о⁣n⁣s⁣ ⁣o⁣r⁣e⁣d⁣⁣⁣⁣S⁣⁣⁣S⁣ ⁣G⁣⁣1⁣ ⁣N⁣K⁣ ⁣H⁣
  • Fish Tank External Heating Rods Automatic Thermostat Aquarium External Heater 30 - Image 1 of 4

    Fish Tank External Heating Rods Automatic Thermostat Aquarium External Heater 30

    Brand new · Unbranded
    £80.68
    (£80.68/kg)
    or Best Offer
    Free postage
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