Water Chillers & Water Heaters Hydroponics

Why reservoir temperature matters

The root zone likes the high teens to the low twenties (°C). Warm nutrient solution holds less dissolved oxygen — the gas roots use fastest — and the water becomes friendlier to the pathogens that cause root rot. Cool it too far and nutrient uptake and growth both drop. Hydro and DWC growers feel this first, because the reservoir is the root zone.

Our range

Water chillers. Reservoir cooling sits with Teco's HY series: combined chiller/heater models, plus the compact HY150 which only chills. Lab and extraction work is the Across International recirculating chillers.

Submersible water heaters. Glass options are Aqua One, Aqua One Thermosafe, and the OASE HeatUp line from 50W to 400W. Aqua One's own guidance pairs wattage to reservoir litres roughly one-for-one — a 100W heater suits a 100L reservoir.

Heating the air instead? Cultiv8 tube heaters, the Vivosun Aeroflux and the AC Infinity Thermoforge live on the grow tent heaters page, not this one.

Choosing temperature control

1. Measure first. Watch the reservoir through a full day. The afternoon peak is what stresses roots.
2. Heaters: match watts to litres. Roughly 1W per litre, then leave the built-in thermostat to hold the setpoint. Glass heaters must run fully submerged.
3. Chillers: size to volume and heat load. Pumps and summer rooms add heat constantly; a unit with headroom cycles less and lasts longer.
4. Heat the air too. If the room falls below the mid-teens overnight in winter, a tube or tent heater does more than a bigger water heater will.

Browse tanks and reservoirs and DWC systems to complete the res, or controllers to automate the lot.