{"product_id":"marina-submersible-heater","title":"Marina Submersible Heater","description":"\u003cstyle\u003e\n.htr{font-size:0.98em;line-height:1.5;}\n.htr h3{margin:16px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;}\n.htr-cross{margin:0 0 14px;}\n.htr ul{margin:6px 0;padding-left:20px;}\n.htr li{margin:4px 0;}\n.htr-feat{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:10px;margin:8px 0 4px;}\n.htr-feat div{border:1px solid #ddd;border-radius:8px;padding:10px 12px;background:#fafafa;}\n.htr-feat strong{display:block;margin-bottom:2px;}\ntable.htr-cmp{border-collapse:collapse;width:100%;margin:6px 0;font-size:0.94em;}\ntable.htr-cmp th,table.htr-cmp td{border:1px solid #ddd;padding:7px 10px;text-align:left;vertical-align:top;}\ntable.htr-cmp thead th{background:#666;color:#fff;}\ntable.htr-cmp th[scope=\"row\"]{background:#f6f6f6;font-weight:600;}\n.htr-note{font-size:0.9em;color:#666;margin:4px 0 0;}\n.htr-faq summary{cursor:pointer;font-weight:600;padding:8px 0;border-bottom:1px solid #eee;}\n.htr-faq p{margin:8px 0 12px;}\n\u003c\/style\u003e\n\u003cdiv class=\"htr\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eMarina Submersible Aquarium Heater\u003c\/strong\u003e keeps your aquarium at a safe, stable temperature so your fish stay healthy and stress-free. Fully submersible with an adjustable thermostat and an easy-to-read temperature scale, it holds your chosen setting and switches on and off automatically. Built with high-impact safety glass and rated for both freshwater and saltwater, it comes in seven sizes from 25 watts for nano tanks up to 300 watts for large aquariums.\u003c\/p\u003e\n\u003cp class=\"htr-cross\"\u003eAlways pair a heater with a thermometer so you can confirm your water temperature at a glance. Add our \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/squeakys-digital-thermometer-aquarium-lcd-probe\"\u003edigital aquarium thermometer\u003c\/a\u003e at Squeaky's Aquatics. Running a nano or betta tank under 5 gallons? Consider the pre-set \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/sicce-jolly-10w-pre-set-aquarium-heater-nano-tank\"\u003eSicce Jolly 10W\u003c\/a\u003e or \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/sicce-jolly-20w-pre-set-aquarium-heater-nano-tank\"\u003e20W\u003c\/a\u003e nano heater instead.\u003c\/p\u003e\n\n\u003ch3\u003eWhy the Marina Heater\u003c\/h3\u003e\n\u003cdiv class=\"htr-feat\"\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eAdjustable thermostat\u003c\/strong\u003eSet your target temperature on the dial and the heater holds it, cycling on and off automatically.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eOn\/off indicator light\u003c\/strong\u003eA red light shows at a glance whether the heater is actively warming the water.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eHigh-impact safety glass\u003c\/strong\u003eA tough, shatter-resistant glass tube stands up to knocks and bumps in the aquarium.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eFully submersible\u003c\/strong\u003eMount it vertically or horizontally, fully underwater, and position it near good water flow for even heat.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eFresh or salt\u003c\/strong\u003eRated for both freshwater and saltwater aquariums.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eSeven sizes\u003c\/strong\u003eFrom 25W nano heaters to 300W for large tanks, so you can match the heater to your volume.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eChoose Your Size\u003c\/h3\u003e\n\u003ctable class=\"htr-cmp\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eModel\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWattage\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eLength\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eHeats up to\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e6 in, 25W\u003c\/th\u003e\n\u003ctd\u003e25 W\u003c\/td\u003e\n\u003ctd\u003e6 in\u003c\/td\u003e\n\u003ctd\u003e5.5 US gal (20 L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e6 in, 50W\u003c\/th\u003e\n\u003ctd\u003e50 W\u003c\/td\u003e\n\u003ctd\u003e6 in\u003c\/td\u003e\n\u003ctd\u003e10 US gal (38 L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e8.5 in, 50W\u003c\/th\u003e\n\u003ctd\u003e50 W\u003c\/td\u003e\n\u003ctd\u003e8.5 in\u003c\/td\u003e\n\u003ctd\u003e15 US gal (50 L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e8.5 in, 100W\u003c\/th\u003e\n\u003ctd\u003e100 W\u003c\/td\u003e\n\u003ctd\u003e8.5 in\u003c\/td\u003e\n\u003ctd\u003e30 US gal (114 L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e10.5 in, 150W\u003c\/th\u003e\n\u003ctd\u003e150 W\u003c\/td\u003e\n\u003ctd\u003e10.5 in\u003c\/td\u003e\n\u003ctd\u003e40 US gal (150 L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e10.5 in, 200W\u003c\/th\u003e\n\u003ctd\u003e200 W\u003c\/td\u003e\n\u003ctd\u003e10.5 in\u003c\/td\u003e\n\u003ctd\u003e55 US gal (200 L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e10.5 in, 300W\u003c\/th\u003e\n\u003ctd\u003e300 W\u003c\/td\u003e\n\u003ctd\u003e10.5 in\u003c\/td\u003e\n\u003ctd\u003e80 US gal (300 L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp class=\"htr-note\"\u003eTank sizes are the ratings printed on each package. Note that the two 50W models differ: the compact 6 inch 50W is rated to about 10 gallons, while the longer 8.5 inch 50W is rated to about 15 gallons. As a rule of thumb, allow roughly 3 to 5 watts per gallon, and size up if your room runs cold.\u003c\/p\u003e\n\n\u003ch3\u003eSetup and Safety\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubmerge the heater fully and let it sit unplugged for 15 to 30 minutes so the glass adjusts to the water temperature before you turn it on.\u003c\/li\u003e\n\u003cli\u003ePlace it near a filter outflow or powerhead so warmed water circulates evenly through the tank.\u003c\/li\u003e\n\u003cli\u003eSet the dial, then check an aquarium thermometer after a few hours and fine-tune as needed.\u003c\/li\u003e\n\u003cli\u003eAlways unplug the heater and let it cool before removing it from the water, and never run it in open air.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"htr-faq\"\u003e\u003csummary\u003eCan I set the exact temperature?\u003c\/summary\u003e\u003cp\u003eYes. This is an adjustable heater with a temperature dial and scale. Turn the dial to your target, and the built-in thermostat cycles the heater on and off to hold it. We still recommend a separate thermometer to verify the reading.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails class=\"htr-faq\"\u003e\u003csummary\u003eIs it safe for saltwater?\u003c\/summary\u003e\u003cp\u003eYes. The Marina Submersible Heater is rated for both freshwater and saltwater aquariums.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails class=\"htr-faq\"\u003e\u003csummary\u003eWhat is the difference between the two 50W versions?\u003c\/summary\u003e\u003cp\u003eThey are rated for different tank sizes. The compact 6 inch 50W suits tanks up to about 10 gallons, while the longer 8.5 inch 50W is rated up to about 15 gallons. The extra glass length on the 8.5 inch model spreads heat over a larger volume, so choose it for a bigger or taller tank.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails class=\"htr-faq\"\u003e\u003csummary\u003eHow do I pick the right wattage?\u003c\/summary\u003e\u003cp\u003eMatch the size to your tank volume using the chart above, allowing about 3 to 5 watts per gallon. If your home is cool or your tank is large, choose the next size up for extra headroom.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails class=\"htr-faq\"\u003e\u003csummary\u003eMy tank is under 5 gallons. Which heater should I use?\u003c\/summary\u003e\u003cp\u003eFor nano and betta tanks, a small pre-set heater like the Sicce Jolly 10W or 20W is a better match than the 25W, since it is tuned for very small volumes.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Marina","offers":[{"title":"6\" 25w","offer_id":48913479368923,"sku":"11230","price":15.99,"currency_code":"USD","in_stock":true},{"title":"6\" 50w","offer_id":48913479401691,"sku":"11231","price":16.99,"currency_code":"USD","in_stock":true},{"title":"8.5\" 50w","offer_id":48913479434459,"sku":"11232","price":22.99,"currency_code":"USD","in_stock":true},{"title":"8.5\" 100w","offer_id":48913479467227,"sku":"11233","price":23.99,"currency_code":"USD","in_stock":true},{"title":"10.5\" 150w","offer_id":48913479499995,"sku":"11234","price":24.99,"currency_code":"USD","in_stock":true},{"title":"10.5\" 200w","offer_id":48913479532763,"sku":"11235","price":26.99,"currency_code":"USD","in_stock":false},{"title":"10.5\" 300w","offer_id":48913479565531,"sku":"11236","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/713ITu4wwQL._AC_SL1500.jpg?v=1782552455","url":"https:\/\/squeakysaquatics.com\/products\/marina-submersible-heater","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}