If the water is constantly moving it will keep the nutrients mixed and maintain a constant temperature. Just use more water in the reservoir and that will help to keep the Ph in balance and the temperature down. Most people donā??t use enough water to let the nutrient buffers do their job.

Even an electromagnetic pump will heat the water to some degree. The idea is to find a balance between a few degrees of heat and the flow of water to cool it back down. If you use the same pump to feed the plants and mix the water itā??s a fair trade off.

You can always add an aquarium chiller if you are worried about the heat. Cool water can hold more oxygen then warm water will and only your budget can tell if the temperature is to warm or not. If you can afford a chiller then run it, if not then all you can do is deal with the few degrees in temperature.
Zandor Reviewed by Zandor on . pump temperature vs noise Can someone tell me if it's better to have the pump submersed in the reservoir or have an external pump? I thinking about the effect the heat from the pump would have on water temperature vs the noise the external pump would make. Anyone try this? Rating: 5