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500 W WATER MASTER Heater keeps the tank within a stable thermal range for indoor cultivation. Adjustable and submersible equipment, designed for volumes of 400–750 L, which helps prevent water below 18–24 ºC and provides consistency to the irrigation system for watering indoor crops with precision.

The 500 W WATER MASTER Heater is designed to stabilize the nutrient solution in medium and large reservoirs, where temperature affects root respiration, salt solubility, and effective oxygenation. The 500 W power provides a wide margin to recover the target temperature after refills with cold water or nighttime drops.
The adjustable thermostat makes it easy to set a comfortable working point within 18–24 ºC, the recommended range to maintain metabolic rate and nutrient uptake.
The submersible body is anchored with suction cups in a vertical position, preferably near a current in the reservoir (inlet or return) to distribute heat evenly and minimize stratification. Installation respects a minimum immersion level indicated on the heater to ensure proper heat transfer.
In 400–750 L reservoirs, this model provides enough thermal inertia for continuous workdays, reducing cold spikes that cause stress.
To extend its useful life, it is advisable to disconnect 15 min before emptying or changing the nutrient solution and allow the heating element to cool. Integrated with recirculation pumps and air diffusers, the set improves EC/pH homogeneity, keeps nutrients in optimal conditions, and increases predictability in each watering cycle.
An essential ally among irrigation accessories in RDWC rooms, flood tables, or master mixing tanks, available at Hydroponics Blanes, online grow shop with technical advice and discreet shipping.
In indoor growing, water temperature influences viscosity, gas exchange, and actual nutrient availability. Keeping the reservoir between 18–24 ºC with the 500 W WATER MASTER Heater reduces blockages from cold roots, improves dissolved oxygen, and delivers regular irrigation in recirculation, ebb&flow, or DWC/RDWC systems.
It is used to warm the nutrient solution in 400–750 L reservoirs, compensate for thermal drops, speed up reaching the range after refills, and keep EC/pH parameters more stable. This promotes a constant root response and uniformity among plants in each indoor growing irrigation cycle.
The right combination boosts performance within the irrigation system:
With this set of irrigation accessories, the solution reaches each emitter with consistent temperature and homogeneous composition.
1) Attach with suction cups in a vertical position, near a current in the reservoir to distribute heat evenly.
2) Check the minimum immersion level before powering the equipment.
3) Adjust the adjustable control to the desired range (e.g., 18–24 ºC) and wait for thermal stabilization.
4) Check with an independent thermometer at several points in the tank to confirm uniformity.
5) Before emptying or replacing the solution, disconnect and wait 15 min for safe cooling.
This protocol prevents thermal shocks and protects the heating element, ensuring water ready for the circuit.
The price may vary depending on campaigns and available packs. It is practical to choose combinations with a thermometer, lids, and fixing elements, completing the thermal set of irrigation accessories in a single order.
Available at Hydroponics Blanes, trusted Grow Shop with discreet shipping throughout Spain. Online grow shop catalog with pumps, air diffusers, and controllers ready to integrate the 500 W WATER MASTER Heater into any irrigation system. After purchase, a 5% discount code for the next order is sent by email.
Anyone operating medium and large reservoirs will find in the 500 W WATER MASTER Heater a direct solution to ensure consistent irrigation: 500 W power, adjustable control, submersible mounting with suction cups, and comfortable operation in 400–750 L.
Thermal stability and nutrient mix always ready, backed by Hydroponics Blanes, fast logistics, and discreet shipping from a specialized online grow shop in equipment and irrigation accessories that make indoor growing irrigation precise.
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