Hailea Tank Heaters - Thermostatic Reservoir Heaters, 50W to 300W
Best for: growers whose reservoir temperature drops too low in cold weather or an unheated grow space, and who need it held at a steady temperature automatically.
Our thoughts
A cold reservoir slows everything down - nutrient uptake, root activity, growth rate, the lot - and it's easy to miss because the plant just looks a bit sluggish rather than obviously unwell. This listing covers Hailea's own range of submersible, fully thermostatic heaters from 50W up to 300W, so pick the wattage that matches your actual reservoir size rather than grabbing whichever one's cheapest.
Hailea Tank Heaters are submersible, fully thermostatically controlled heaters designed for nutrient reservoirs and aquariums alike. In cold weather, or in an unheated grow space, reservoir temperature can drop low enough to stunt plant growth, and these heaters hold the solution at a steady, set temperature automatically rather than needing constant manual adjustment.
The range spans 50W, 150W and 300W models, scaling to suit small, medium and larger reservoirs. Each heater includes a visible temperature dial for at-a-glance monitoring, along with mounting clips and suction cups to secure it inside the tank. As a rule of thumb across the Hailea heater family, wattage should be matched to reservoir volume - the 300W model, for example, is rated for reservoirs up to around 450 litres - so it's worth checking the specific size guide for whichever wattage you're considering rather than assuming any model will suit any tank.
How it compares
Thermostatic reservoir heaters are largely repurposed aquarium heater technology, and Hailea competes directly with several aquarium-first brands that have crossed into hydroponics.
- Hydor's Theo range of thermostatic heaters is a well-known alternative, generally similarly priced but marketed primarily at the aquarium trade rather than hydroponics.
- Fluval's E-series heaters offer more advanced digital temperature control but at a noticeably higher price than the Hailea range.
- TMC Aquastar heaters are a further aquarium-focused alternative, typically priced in a similar bracket to Hailea's mid-range wattages.
Hailea's range covers the practical wattage spread most growers need at a lower price than the more aquarium-specialist brands, without giving up basic thermostatic control.
Usage guidance
Sizing
Match the wattage to your reservoir volume - smaller reservoirs suit the 50W model, with 150W and 300W stepping up for medium and larger tanks respectively.
Mounting
Use the supplied clips and suction cups to secure the heater fully submerged and away from the direct flow of a water pump outlet.
Setting temperature
Set the thermostat dial to your target reservoir temperature and allow time for the tank to stabilise before fine-tuning.
Safety
Always submerge the heater fully before switching it on, and never operate it out of water, in line with standard practice for any thermostatic aquarium-style heater.
Technical specifications
- Available wattages: 50W, 150W, 300W
- Control: fully thermostatic, with visible temperature dial
- Mounting: supplied clips and suction cups
- 300W guide capacity: reservoirs up to approx. 450 litres (check specific size guide for 50W/150W models)
- Application: hydroponic nutrient reservoirs and aquariums
- Manufacturer: Hailea
Who this is for
- Growers in cold grow rooms, garages or unheated spaces over winter
- Anyone running a reservoir that's dropped below optimal nutrient uptake temperature
- Growers wanting automatic thermostatic control rather than manual monitoring
- Small to medium reservoir setups needing a straightforward, budget-friendly heater
Our take
A reservoir that's too cold causes just as many problems as one that's too warm, just more quietly, and a thermostatic heater is the simplest fix. Hailea's range covers small to large reservoirs across three wattages, so it's mostly a case of matching the model to your actual tank size.
Does exactly what it should, day in, day out. Worth picking up before winter rather than after you've already noticed growth slow down.
