Hydor Theo Water Heaters
Aquarium heater has all the necessary features for safe and precise temperature maintenance of the water in your tank. The exclusive technology and the high quality of the components guarantee a long lasting product. Submersible, no thermal shock, high impact resistance, graduated scale, vertical and horizontal positioning, precise maintenance of set temperature.
Which heater do you need?
You can overspec and use more than one heater if you need to.
If you had a 400L tank, you would need a 300W heater and 150W heater
You need 1W per Litre of nutrient - e.g. if you have a 150L tank, you would need a 150W nutrient heater.
Mainland England & Wales
We ship parcels using DHL tracked Service. DHL will send you tracking information by email or text to inform you know when they will be delivering your parcel.
Small items are sent via a Royal Mail tracked service.
Our cut-off time for deliveries to leave us the same day is 3pm Monday to Friday.
In Stock: 1 - 2 Working Days
Out of Stock: 2 - 4 Working Days
Items Marked 'Out of Stock' on the website are not currently available from our supplier. Please call or email & we will update you when available.
If any item ordered is unavailable we will contact you by email or phone with expected delivery times. We only debit orders on dispatch so should you wish to cancel, we will do so.
Free Product Exchange:
We allow 30 days for a product exchange. On receipt of the original unused items we will return your exchange carriage free.
Terms and conditions apply.
Scottish Highlands / Northern Ireland
The cut off time for deliveries to leave us the same day is 3pm Monday to Friday.
We ship using DHL tracked service. DHL will send tracking information by email or text so you know when they will be delivering your parcel.
Small items are sent via a Royal Mail tracked service.
Free Collection:
Please arrange a collection time and date with our team if you wish to collect your order.
