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🔥Description🔥
The RS Electrical RS-399 (300W) stainless steel aquarium heater is built for reliable, long-term heating of medium-to-large aquariums. With a robust 300W element housed in corrosion-resistant stainless steel, the RS-399 delivers stable temperature control across a wide range (12°C–34°C / 53°F–93°F). Suitable for many cold, temperate, and tropical setups.
Designed for full submersion, the slim 38 × 2.5 × 2.5 cm form factor mounts easily inside the tank with two suction cups. The heater offers automatic thermostat control with a visual indicator light — set your target temperature and the unit will cycle on/off to maintain it. Stainless steel construction reduces breakage risk compared with glass heaters and is well-suited for demanding aquaria.
Always verify temperature with a separate thermometer and use a GFCI-protected outlet for safety. Photos are self-taken; color/appearance may vary slightly.
📌Specifications📌
- Product Name: RS Electrical RS-399 Stainless Steel Aquarium Heater (300W).
- Brand: RS Electrical.
- Origin: China.
- Model: RS-399 (300W).
- Power: 300W.
- Voltage / Frequency: 220–240V ~50–60Hz.
- Temperature Range: Adjustable 12°C – 34°C (53°F – 93°F).
- Recommended Aquarium Capacity: 250 – 300 L.
- Material: Stainless steel heating sleeve, plastic end caps/controls, rubber seals.
- Dimensions (L × H × W): 38 × 2.5 × 2.5 cm.
- Item Weight: 380 g (with box).
- Mounting: 2 suction cups included for glass attachment.
- Operation: Fully submersible, thermostatic auto on/off with indicator light.
- Protection / Safety: Designed for submersion — ensure seals and cable are intact before use; use a GFCI outlet.
- Suitable For: Freshwater & many marine applications.
- Safety Notes: Use a GFCI outlet, avoid running dry, and inspect seals before use.
- Included Images: Self-taken (original).
- Disclaimer: Color & intensity may vary slightly depending on monitor and photography Lighting.
🍁Key Features🍁
🎪 Power: 300W — powerful heating for medium-large tanks.
🎪 Adjustable Thermostat: 12°C – 34°C (53°F – 93°F) for wide-range applications.
🎪 Stainless Steel Body: corrosion-resistant and durable for long life.
🎪 Fully Submersible: designed for continuous underwater use.
🎪 Auto On/Off + Indicator Light: set-and-forget temperature control with visual status.
🎪 Slim 38cm Length: fits large tanks while remaining discreet.
🎪 Includes 2 Suction Cups for secure glass mounting.
🎪 Recommended Aquarium: 250–300 L.
🛡️Usage Instructions🛡️
🚀 Inspect: Unpack and check the heater, seals, cord, and suction cups for visible damage.
🚀 Mount: Attach suction cups to the heater and press onto clean aquarium glass.
🚀 Set Temperature: Adjust the thermostat knob to the desired temperature between 12°C–34°C.
🚀 Submerge: Ensure the heater is fully submerged before powering on.
🚀 Power: Plug into a grounded 220–240V outlet protected by GFCI or surge protector.
🚀 Verify: Use an independent aquarium thermometer to confirm a stable temperature after a few hours.
🚀 Maintenance: Periodically unplug before removal, clean gently to remove algae, inspect seals; replace if damaged.
🚀 Storage: When not in use, dry and store in a safe place.
📒Note:📒
⚠️ Do not operate the heater dry. Always submerge before switching on.
⚠️ Use GFCI/protected outlets for safety and keep plug/cable dry.
🎈What’s in the Box🎈
💥 1 × RS Electrical (RS-399) Stainless Steel Aquarium Heater (300W).
💥 2 × Suction cups for glass mounting
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