{"product_id":"submersible-aquarium-heater-adjustable-thermostat-fs386","title":"Submersible Aquarium Heater FS-386 with Adjustable Thermostat, Fish Tank Water Heating Rod in 25W, 50W, 100W or 300W for Indoor Aquatic Setups","description":"\u003ch2\u003eSubmersible Aquarium Heater FS-386\u003c\/h2\u003e\u003cp\u003eBuild your indoor aquarium care routine around a fish tank heater with an adjustable thermostat. The FS-386 range offers 25W, 50W, 100W and 300W model choices, allowing you to select a heating rod after checking the requirements of your tank and aquatic animals.\u003c\/p\u003e\u003cp\u003eDuring your daily tank check, monitor water temperature with an appropriate separate thermometer and review the heater's operation. The available text does not specify model-by-model tank capacity, voltage or temperature range, so confirm those details on the selected unit and its instructions before installation.\u003c\/p\u003e\u003ch2\u003eAquarium Heating Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e🌡️ \u003cstrong\u003eAdjustable thermostat:\u003c\/strong\u003e The original listing describes adjustable temperature control rather than a fixed preset.\u003c\/li\u003e\n\u003cli\u003e💧 \u003cstrong\u003eSubmersible heater design:\u003c\/strong\u003e Listed as a water-heating rod for aquarium use; follow the unit's required water level and installation instructions.\u003c\/li\u003e\n\u003cli\u003e⚡ \u003cstrong\u003eFour power choices:\u003c\/strong\u003e Choose FS-386-25W, FS-386-50W, FS-386-100W or FS-386-300W.\u003c\/li\u003e\n\u003cli\u003e🐠 \u003cstrong\u003eIndoor aquatic setup use:\u003c\/strong\u003e Intended for aquarium water heating when the selected model matches your setup.\u003c\/li\u003e\n\u003cli\u003e🔎 \u003cstrong\u003eClear model selection:\u003c\/strong\u003e Each variant identifies its wattage; do not assume every model suits the same tank size.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct type\u003c\/th\u003e\n\u003ctd\u003eSubmersible aquarium water heater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModel family\u003c\/th\u003e\n\u003ctd\u003eFS-386\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable models\u003c\/th\u003e\n\u003ctd\u003eFS-386-25W; FS-386-50W; FS-386-100W; FS-386-300W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eListed wattages\u003c\/th\u003e\n\u003ctd\u003e25W, 50W, 100W and 300W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eControl\u003c\/th\u003e\n\u003ctd\u003eAdjustable thermostat, as listed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIntended setting\u003c\/th\u003e\n\u003ctd\u003eIndoor aquarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTank capacity by model\u003c\/th\u003e\n\u003ctd\u003eNot specified; confirm before selecting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVoltage, plug and temperature range\u003c\/th\u003e\n\u003ctd\u003eNot specified in available product text\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions, materials and included accessories\u003c\/th\u003e\n\u003ctd\u003eNot specified in available product text\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: Is this aquarium heater suitable for betta fish or turtles?\u003c\/strong\u003e\u003cbr\u003eA: The original title mentions betta fish and turtles, but suitability depends on your tank, the selected heater and the animal's care requirements. Confirm the temperature range, installation method and any necessary protective equipment before use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Which wattage should I choose for my fish tank?\u003c\/strong\u003e\u003cbr\u003eA: Choose using the manufacturer's model-specific tank guidance and your setup's heating needs. The available text does not map 25W, 50W, 100W or 300W to individual tank capacities, so a universal gallon recommendation is not provided here.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is this a useful gift for an aquarium hobbyist?\u003c\/strong\u003e\u003cbr\u003eA: It can be practical when the recipient needs a compatible heater. Confirm their tank requirements, preferred wattage, voltage and plug compatibility before choosing a model.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: How do I install and adjust this submersible heater?\u003c\/strong\u003e\u003cbr\u003eA: Follow the supplied instructions for placement, water level, temperature adjustment and electrical connection. Confirm the unit's voltage and plug first, monitor temperature independently and disconnect power before handling or tank maintenance as instructed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Are a thermometer, guard or mounting accessories included?\u003c\/strong\u003e\u003cbr\u003eA: The available text does not confirm a thermometer, protective guard or mounting accessories. Check the selected model's package contents rather than assuming accessories from another listing are included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is this a STEM kit or smart aquarium controller?\u003c\/strong\u003e\u003cbr\u003eA: It is aquarium heating equipment, not a STEM kit. No app control, Wi-Fi, educational experiments or smart monitoring features are listed.\u003c\/p\u003e\u003cimg src=\"https:\/\/img.kwcdn.com\/product\/fancy\/2e7d8c56-3208-4600-8b0b-070867410d5a.jpg\"\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/img.kwcdn.com\/product\/fancy\/61c55bfa-331c-46d6-8226-20470c066460.jpg\"\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/img.kwcdn.com\/product\/fancy\/75149be6-ee7f-4990-a8f3-08fec6e41249.jpg\"\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/img.kwcdn.com\/product\/fancy\/5d014128-0234-4e8e-a59a-c910ba059c92.jpg\"\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/img.kwcdn.com\/product\/fancy\/34077ba1-88ba-443c-ada0-5d4e403483c0.jpg\"\u003e\u003ch2\u003eFast US Shipping\u003c\/h2\u003e\u003cp\u003eShips from US warehouse, free delivery 2-7 business days\u003c\/p\u003e","brand":"Goodie Pet","offers":[{"title":"FS-386-25W","offer_id":50600751071472,"sku":null,"price":48.99,"currency_code":"USD","in_stock":true},{"title":"FS-386-50W","offer_id":50600751104240,"sku":null,"price":48.99,"currency_code":"USD","in_stock":true},{"title":"FS-386-100W","offer_id":50600751137008,"sku":null,"price":49.99,"currency_code":"USD","in_stock":true},{"title":"FS-386-300W","offer_id":50600751169776,"sku":null,"price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/0308\/0176\/files\/2e7d8c56-3208-4600-8b0b-070867410d5a.jpg?v=1791727103","url":"https:\/\/goodiepet.com\/products\/submersible-aquarium-heater-adjustable-thermostat-fs386","provider":"Goodie Pet","version":"1.0","type":"link"}