Oase HeatUp Aquarium Heater

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Oase HeatUp Aquarium Heater
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Oase heater, aquarium heater

Oase HeatUp Aquarium Heater

  • It is recommended to use a heater of a wattage equal to the volume of your aquarium. So a 100 W heater is suitable for aquariums of a maximum 100 L
  • Consistent temperature level thanks to patented bimetal technology
  • Manufactured from safe temperature resistant quartz glass
  • Designed specifically to inside Oase BioPlus Thermo and BioMaster Thermo filters. 
  • This product comes with a 3-year warranty.

Although fish are considered to be cold-blooded animals, they do not like extreme temperature fluctuations. Consequently, particularly for tropical fish and plants, a heater that ensures warm temperatures is always required. The robust HeatUp adjustable heaters regulate temperature precisely, and thanks to its patented control system enable precise adjustment. The activated indicator light lets you control the heating function with ease. The HeatUp adjustable heater is suitable for use in freshwater and saltwater aquariums. It can also be retrofitted with the BioMaster, BioPlus and FiltoSmart.

Key Features:

Consistent Temperature
Oase HeatUp aquarium heaters produce a consistent temperature level thanks to their patented bimetal technology. The uniquely designed control system enables precise adjustment of the temperature by approximately 3°C.

Safe and Robust Design
The high quality workmanship and resistant quartz glass materials make these units sturdy and long lasting. They are intended for continuous submerged use and are incredibly easy to install with the included brackets. The status of the heat element can be easily checked by the displayed indicator light.

Compatible with Other Oase Products
Oase HeatUp heaters are intended for use with their BioPlus Thermo and BioMaster Thermo filters; an internal and external filter that both allow for a heater to be installed in them. This means less equipment in your aquarium giving more space for your fish and a much more natural appearance.

HeatUp 25 HeatUp 50 HeatUp 75 HeatUp 100 HeatUp 150 HeatUp 200 HeatUp 250 HeatUp 300
Aquarium Volume Up to 25 L Up to 50 L Up to 75 L Up to 100 L Up to 150 L Up to 200 L Up to 250 L Up to 300 L
Power 25 W 50 W 75 W 100 W 150 W 200 W 250 W 300 W
Product Dimensions (L x W x H) 20.5 x 2.3 x 2.3 cm 20.5 x 2.3 x 2.3 cm 24.5 x 2.3 x 2.3 cm 24.5 x 2.3 x 2.3 cm 31.5 x 2.3 x 2.3 cm 31.5 x 2.3 x 2.3 cm 37 x 2.3 x 2.3 cm 37 x 2.3 x 2.3 cm

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Delivery costs for your order will be calculated during the checkout process based on your delivery address and the contents of your basket. You will only pay one delivery charge for your order. Express delivery is FREE for online orders OVER £39 unless any of the points below become a factor.

  • Some large items like aquariums, ponds and pond liners will have an additional charge of £45.00 to help offset the cost of a pallet delivery.
  • Orders containing a physical gift card will have an additional charge of £2.45 to cover the cost of materials and delivery (digital gift cards are a free alternative).
  • Orders to highlands, islands and Northern Ireland may incur an additional delivery charge displayed at checkout this is based on the postal code provided. DPD provides a list of postal codes which have additional surcharges. Some of these post codes may also take 2 working days to arrive, even on express. Pallet deliveries cannot be sent to these post codes.

We only ship to the UK and cannot ship internationally.

We aim to dispatch items that are currently in stock on the same working day if they are ordered before 2.45 pm (excluding Bank Holidays). Orders after 3pm will be dispatched the following working day, unless it fits any of the below criteria:

  • Orders containing live plants will take up to 2 weeks to arrive. We take a week's worth of customer orders and then inform the plant farms of the specific quantities we need to fulfil that week's order to avoid wastage.
  • Pallet orders containing large items like big aquariums will take additional time to arrive as they are sent by a third party. These orders will NOT be dispatched until we have been in touch to arrange a delivery date, this is to ensure someone is available at your address to sign for the delivery. Deliveries will generally be delivered ‘curb side’ within the terms of the agreement we have with our couriers so you will need to make arrangements to transfer larger items into your home yourself. Unfortunately, our drivers are not insured to transfer the aquarium into your home.
  • Physical gift cards and items from the gift shop (such as clothes, towels etc) are sent with 1st Class Royal Mail. Delivery usually takes 1-2 working days, though in rare cases and orders placed closer to public holidays (Christmas, Father’s day, Mother’s day etc.) may be longer.


If you are not 100% satisfied with your purchase online from our website, you can return the product and get a full refund or exchange the product for another one, for up to 21 days from the date you purchased it.

We strongly suggest signing up for an account with fishkeeper.co.uk as this will allow for some additional returns options like return to your local store.

If you checkout as a guest you will need to return the product to Maidenhead Aquatics, PO Box 619, Egham, Surrey, TW20 2BS, please package the order (along with a packing slip or a note including your name, address and order number).

Large pallet items like aquariums are deemed delivered successfully with no damage once the the driver has left the property. If a report of damage is submitted after the driver has left we may be unable to assist with replacements. We recommend refusing a damaged delivery, this is the fastest resolution.

Our full terms and conditions can be found here. When you place an order with us online you are agreeing to these terms and conditions.

For delivery before Christmas, orders must be placed on or before 3pm on Wednesday 20th December. We cannot guarantee delivery of these orders pre-Christmas as we are reliant on our couriers, but will use our best endeavours to get orders placed on this date out to you before Christmas. For full details of our festive delivery and opening times click here

Please note: online orders placed after 3pm on Friday 22nd December will not be dispatched until the New Year. For full details of our festive delivery and opening times click here