TECO Chillers

TECO Chillers

IMPORTANT! Before purchasing any chiller you should consider all the points below.

All TECO TK chillers from the TK 500 upwards can heat* as well as chill. Simply set the chiller to your desired temperature and the chiller will hold your aquarium at that temperature. This is a highly efficient way of maintaining your aquarium’s temperature without the use of external heaters. (*Initial batches of the new TK 500, TK 1000 and TK 2000 chillers using the new environmentally-friendly gas R290 were NOT fitted with heaters. However, this range of chillers will be available with heaters fitted as standard from late June 2021.)

The TK 3000, TK 6000 and TK 9000 models are capable of heating as well as chilling. They can also be fitted with inboard UVC systems, and heater upgrade kits and UVC upgrade kits are available from us (see individual chiller for details).

If you are not sure which chiller you require, please contact us and we will be able to work out which model would best suit your needs.

When purchasing a chiller there are many things to consider beyond price and looks. It must be remembered that an aquarium chiller takes heat out of the aquarium, it does not put cold in. The water returning from the chiller unit is colder than the water entering the chiller but this is because the heat has been removed.


As we have established above, a chiller removes heat from the aquarium. The chiller unit then has to discharge that heat somewhere in exactly the same manner as the fridge in your kitchen does. If you feel the back of your refrigerator it will be warm; this is because it is removing heat from inside the fridge. If your chiller is located in an unventilated cupboard under your aquarium it will simply recycle that heat and drastically impair the chiller’s performance, so ventilation and air space are absolutely essential for the correct working of your chiller.

Sources of heat

Your aquarium may be located in a room where the temperature can fluctuate between 20°c-30°c, which can have a significant impact on the inhabitants of your aquarium. Heat is generated by just about every electrical item you have in, on, above and in the sump of your aquarium. Pumps, lights, UVs, power skimmers, etc, all add heat to your aquarium. Please also consider the location of your pipe-work to and from your chiller. There is no point locating your chiller in a well-ventilated location then running your pipe-work directly under a heat source such as a metal halide light. Consider insulating this pipe-work if possible.


This is crucial if you are to get the best out of your investment in a chiller. First use the TECO Aquarium sizing calculator, which is available from the App Store for Apple devices, and from the Google Play Store  for Android devices. Just click on the Union Jack for the English version once you have downloaded the calculator. It is important that you DO NOT subtract volume for displacement of rock and decor in the aquarium as these items will also hold heat. It must also be remembered that dark objects such as rock will absorb heat from your lighting. It is a false economy and will not achieve the results you require to undersize your chiller. Remember, if the chiller is too small it may not work at all! It is also very important to ensure your chiller has the correct flow rate for the model you are using. Too little or too much flow will also impair your chiller’s performance. If you are at all unsure, please do call us for advice.

If you require any further assistance, please don’t hesitate to contact us; our trained staff will be able to help you from sizing to installation.

Tel: 01509 262330

Fax: 01509 239445