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Fluval P25 Submersible Aquarium Heater for Up to 6 Gallons, 25 Watts Strong shatterproof polymer construction protect tank and inhabitants from damageCaronlab 
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De'Longhi Radia S Electric Oil Column Heater TRRS0510T, 5 Fin Home Heater for Smaller Rooms, 3 Power Settings, 24-Hour T 7 Year Warranty: DeLonghi offers an extended 7 year warranty across all Oil Column Heaters.Demfec 
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