{"product_id":"aqua-one-glass-heater","title":"Aqua One Glass Heater","description":"\u003ch2\u003eAqua One Glass Aquarium Heater\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAqua One Glass Heater\u003c\/strong\u003e is an adjustable, fully submersible aquarium heater designed to maintain a stable water temperature in tropical freshwater and marine aquariums.\u003c\/p\u003e\n\u003cp\u003eAvailable from \u003cstrong\u003e25W through to 300W\u003c\/strong\u003e, there is a model for everything from small tropical aquariums through to larger display tanks.\u003c\/p\u003e\n\u003cp\u003eThe adjustable thermostat allows you to select a temperature between approximately \u003cstrong\u003e20°C and 34°C\u003c\/strong\u003e, while the indicator light shows when the heater is actively heating the aquarium.\u003c\/p\u003e\n\u003ch3\u003eWhy Use an Aquarium Heater?\u003c\/h3\u003e\n\u003cp\u003eMost tropical aquarium fish require water that is warmer and more stable than normal room temperature.\u003c\/p\u003e\n\u003cp\u003eAn aquarium heater helps maintain that temperature automatically.\u003c\/p\u003e\n\u003cp\u003eOnce you've selected your desired temperature, the thermostat switches the heating element on and off as required rather than continuously heating the aquarium.\u003c\/p\u003e\n\u003cp\u003eA stable temperature is particularly important because sudden temperature swings can stress aquarium livestock.\u003c\/p\u003e\n\u003ch3\u003eWho Is It For?\u003c\/h3\u003e\n\u003cp\u003eWe recommend the Aqua One Glass Heater for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eTropical freshwater aquariums\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCommunity fish tanks\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePlanted aquariums\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBetta aquariums\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCichlid tanks\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMarine aquariums\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCustomers wanting a straightforward adjustable heater\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAnyone replacing a basic or failed aquarium heater\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt is \u003cstrong\u003enot normally required for genuine coldwater setups\u003c\/strong\u003e unless the room temperature is dropping below the suitable range for the livestock being kept.\u003c\/p\u003e\n\u003ch3\u003eWhich Heater Size Should I Buy?\u003c\/h3\u003e\n\u003cp\u003eChoosing the correct wattage is one of the most important parts of buying an aquarium heater.\u003c\/p\u003e\n\u003cp\u003eAs a general guide for the Aqua One Glass Heater range:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e25W\u003c\/strong\u003e\u003cbr\u003eFor aquariums up to approximately \u003cstrong\u003e25L\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e55W\u003c\/strong\u003e\u003cbr\u003eFor aquariums up to approximately \u003cstrong\u003e55L\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e100W\u003c\/strong\u003e\u003cbr\u003eFor aquariums up to approximately \u003cstrong\u003e100L\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e150W\u003c\/strong\u003e\u003cbr\u003eFor aquariums up to approximately \u003cstrong\u003e150L\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e200W\u003c\/strong\u003e\u003cbr\u003eFor aquariums up to approximately \u003cstrong\u003e200L\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e300W\u003c\/strong\u003e\u003cbr\u003eFor aquariums up to approximately \u003cstrong\u003e300L\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThese are useful manufacturer guidelines, but don't treat the litre rating as the only factor.\u003c\/p\u003e\n\u003cp\u003eThe heater also has to overcome the difference between your \u003cstrong\u003eroom temperature and desired aquarium temperature\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eFor example, keeping a tank at 25°C in a warm room is easier than maintaining 25°C in a cold Christchurch garage or poorly heated room during winter.\u003c\/p\u003e\n\u003cp\u003eIf you're right on the limit between two heater sizes, we'd generally lean toward the larger option rather than asking a small heater to run constantly.\u003c\/p\u003e\n\u003ch3\u003eHeater Size Guide\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAquarium Size\u003c\/th\u003e\n\u003cth\u003eHeater We'd Usually Start With\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eUp to 25L\u003c\/td\u003e\n\u003ctd\u003e25W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e25–55L\u003c\/td\u003e\n\u003ctd\u003e55W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e55–100L\u003c\/td\u003e\n\u003ctd\u003e100W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e100–150L\u003c\/td\u003e\n\u003ctd\u003e150W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e150–200L\u003c\/td\u003e\n\u003ctd\u003e200W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e200–300L\u003c\/td\u003e\n\u003ctd\u003e300W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eFor tanks larger than this, or aquariums sitting in particularly cold environments, you may be better using a higher-capacity heating solution or multiple heaters.\u003c\/p\u003e\n\u003ch3\u003eWhat Temperature Should I Set It To?\u003c\/h3\u003e\n\u003cp\u003eThat depends on the fish you keep.\u003c\/p\u003e\n\u003cp\u003eFor many standard tropical community aquariums, somewhere around \u003cstrong\u003e24–26°C\u003c\/strong\u003e is common.\u003c\/p\u003e\n\u003cp\u003eHowever, don't simply set every aquarium to 25°C because it's a tropical tank.\u003c\/p\u003e\n\u003cp\u003eDifferent species have different preferred temperature ranges.\u003c\/p\u003e\n\u003cp\u003eFor example, some tropical fish prefer cooler water while Discus and certain other species are generally kept considerably warmer.\u003c\/p\u003e\n\u003cp\u003eAlways choose the temperature based on your actual livestock.\u003c\/p\u003e\n\u003ch3\u003eAlways Use a Separate Thermometer\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDon't rely entirely on the number printed on the heater dial.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWe strongly recommend using a separate aquarium thermometer so you can see the actual water temperature.\u003c\/p\u003e\n\u003cp\u003eThe heater thermostat controls the heater, but your thermometer tells you what's genuinely happening inside the tank.\u003c\/p\u003e\n\u003cp\u003eAfter installing or adjusting a heater, check the aquarium temperature over the following day rather than assuming the dial is perfectly calibrated.\u003c\/p\u003e\n\u003ch3\u003eWhere Should I Put the Heater?\u003c\/h3\u003e\n\u003cp\u003ePlace the heater somewhere with \u003cstrong\u003egood water circulation\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eNear the filter outlet or another area of consistent water movement is usually ideal because heated water is then distributed throughout the aquarium rather than creating one particularly warm area.\u003c\/p\u003e\n\u003cp\u003eMake sure the heater remains properly submerged according to the manufacturer's instructions.\u003c\/p\u003e\n\u003cp\u003eAvoid positioning it where rocks or heavy décor can fall against the glass.\u003c\/p\u003e\n\u003ch3\u003eHow Do I Set It Up?\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cp\u003eCheck the heater for any cracks or damage before installation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAttach the suction cups securely.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePosition the heater somewhere with good water circulation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMake sure it is correctly submerged.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSet the thermostat to the temperature required by your livestock.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAllow the heater to sit in the aquarium water before operating it.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePlug the heater in.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCheck the actual water temperature with a separate thermometer.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMake small adjustments if required.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eOnce installed, check the temperature regularly rather than assuming the heater will never require attention.\u003c\/p\u003e\n\u003ch3\u003eImportant Heater Safety\u003c\/h3\u003e\n\u003cp\u003eAquarium heaters combine \u003cstrong\u003eelectricity, glass and water\u003c\/strong\u003e, so treat them properly.\u003c\/p\u003e\n\u003cp\u003eA few rules we'd strongly recommend:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eNever operate the heater out of water.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eKeep the heater properly submerged.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUnplug the heater before draining water during aquarium maintenance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNever expose a hot heater to air or cold replacement water.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIf removing the heater, switch it off and allow it time to cool first.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDo not use a heater if the glass is cracked or moisture appears inside it.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUse a drip loop in the electrical cable.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eKeep heavy rocks and décor away from the heater.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAqua One recommends allowing approximately \u003cstrong\u003e10–15 minutes for the heater to cool before removing it from the aquarium\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eA Very Common Water-Change Mistake\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTurn your heater off before doing a water change.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis is one we see more often than we'd like.\u003c\/p\u003e\n\u003cp\u003eIf the water level drops and leaves part of a glass heater exposed while it is still operating, the heater can become extremely hot.\u003c\/p\u003e\n\u003cp\u003eThen when cold replacement water hits the hot glass, you dramatically increase the chance of damaging the heater.\u003c\/p\u003e\n\u003cp\u003eOur routine is simple:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter off. Heater off. Water change. Refill the aquarium. Then turn everything back on once the equipment is properly submerged again.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eShould I Use a Heater Protector?\u003c\/h3\u003e\n\u003cp\u003eFor many standard community aquariums, it isn't compulsory.\u003c\/p\u003e\n\u003cp\u003eHowever, a heater guard can be worthwhile in aquariums containing:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eLarge fish\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBoisterous cichlids\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTurtles or other suitable aquatic animals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHeavy rockwork\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFish likely to rest against equipment\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSituations where the heater could easily be knocked\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA heater protector helps reduce direct contact with the heater and can also provide some physical protection for the glass.\u003c\/p\u003e\n\u003ch3\u003eOne Large Heater or Two Smaller Heaters?\u003c\/h3\u003e\n\u003cp\u003eFor a normal small or medium aquarium, one appropriately sized heater is usually perfectly practical.\u003c\/p\u003e\n\u003cp\u003eFor very large or valuable aquariums, some aquarists prefer using \u003cstrong\u003etwo smaller heaters\u003c\/strong\u003e rather than relying entirely on one large heater.\u003c\/p\u003e\n\u003cp\u003eFor example, instead of one very large heater, two units can be positioned at different ends of the aquarium.\u003c\/p\u003e\n\u003cp\u003eThis can:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eImprove heat distribution\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProvide some redundancy if one heater stops working\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eReduce reliance on a single heating element\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt isn't essential for every aquarium, but it's something we'd consider on larger systems.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e Aqua One\u003cbr\u003e\u003cstrong\u003eProduct:\u003c\/strong\u003e Glass Aquarium Heater\u003cbr\u003e\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e Approximately 20–34°C\u003cbr\u003e\u003cstrong\u003eDesign:\u003c\/strong\u003e Fully submersible glass heater\u003cbr\u003e\u003cstrong\u003eThermostat:\u003c\/strong\u003e Adjustable\u003cbr\u003e\u003cstrong\u003eHeating Indicator:\u003c\/strong\u003e Yes\u003cbr\u003e\u003cstrong\u003eSuitable For:\u003c\/strong\u003e Tropical freshwater and marine aquariums\u003c\/p\u003e\n\u003ch3\u003eAvailable Sizes\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e25W – 18.5cm\u003c\/strong\u003e\u003cbr\u003eRecommended aquarium volume: up to approximately 25L\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e55W – 20.5cm\u003c\/strong\u003e\u003cbr\u003eRecommended aquarium volume: up to approximately 55L\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e100W – 24.5cm\u003c\/strong\u003e\u003cbr\u003eRecommended aquarium volume: up to approximately 100L\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e150W – 24.5cm\u003c\/strong\u003e\u003cbr\u003eRecommended aquarium volume: up to approximately 150L\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e200W – approximately 30cm\u003c\/strong\u003e\u003cbr\u003eRecommended aquarium volume: up to approximately 200L\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e300W – 35.5cm\u003c\/strong\u003e\u003cbr\u003eRecommended aquarium volume: up to approximately 300L\u003c\/p\u003e\n\u003ch3\u003eSimply Fish Recommends\u003c\/h3\u003e\n\u003cp\u003eFor a straightforward tropical aquarium, \u003cstrong\u003ethe Aqua One Glass Heater is one of those products that doesn't need to be complicated\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eChoose the appropriate wattage, put it somewhere with decent flow, set the correct temperature for your fish and verify that temperature with a separate thermometer.\u003c\/p\u003e\n\u003cp\u003eThe two mistakes we'd most like customers to avoid are:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1. Buying a heater that's too small.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIf you've got a 100L aquarium sitting in a cold room, don't expect a tiny heater designed for a nano tank to keep up.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2. Forgetting to turn the heater off during water changes.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA glass heater sitting half out of the water while it's powered on is asking for trouble.\u003c\/p\u003e\n\u003cp\u003eIf your aquarium sits right on the limit between two heater sizes — particularly in a cold Christchurch home over winter — we'd normally lean toward the larger model rather than making the smaller heater work flat out.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat wattage aquarium heater do I need?\u003c\/strong\u003e\u003cbr\u003eAqua One's range broadly matches heater wattage to aquarium volume: 25W for up to 25L, 55W for up to 55L, 100W for up to 100L, 150W for up to 150L, 200W for up to 200L and 300W for up to 300L.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat temperature should I set my aquarium heater to?\u003c\/strong\u003e\u003cbr\u003eThat depends on the species you keep. Many tropical community aquariums operate around 24–26°C, but always check the requirements of your actual fish.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I fully submerge the Aqua One Glass Heater?\u003c\/strong\u003e\u003cbr\u003eYes. The Aqua One Glass Heater is designed to be fully submersible.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the heater turn itself off?\u003c\/strong\u003e\u003cbr\u003eYes. The thermostat cycles the heating element on and off as required to maintain the selected temperature.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is the light on my heater switching on and off?\u003c\/strong\u003e\u003cbr\u003eThat's normal. The indicator shows when the heating element is operating. Once the thermostat reaches the required temperature, the heater switches off until more heat is required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I still need a thermometer?\u003c\/strong\u003e\u003cbr\u003eYes. We strongly recommend one. A separate thermometer lets you verify the actual aquarium temperature rather than relying solely on the heater dial.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhere should I place the heater?\u003c\/strong\u003e\u003cbr\u003ePut it somewhere with good water movement, such as near the filter outlet, so heat is distributed throughout the aquarium.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I turn my heater off during a water change?\u003c\/strong\u003e\u003cbr\u003eYes. Turn it off before lowering the water level and don't switch it back on until the aquarium has been refilled and the heater is properly submerged.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long should I wait before removing a heater?\u003c\/strong\u003e\u003cbr\u003eAqua One recommends switching it off and allowing approximately 10–15 minutes for it to cool before removing it from the aquarium.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use an Aqua One Glass Heater in a marine tank?\u003c\/strong\u003e\u003cbr\u003eYes. Aqua One lists the range as suitable for tropical freshwater and marine aquariums.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I buy a bigger heater than my aquarium needs?\u003c\/strong\u003e\u003cbr\u003eDon't massively oversize it unnecessarily, but if you're right on the boundary between sizes or the aquarium is kept in a particularly cold room, we'd usually favour the next appropriate size rather than undersizing the heater.\u003c\/p\u003e\n\u003c!----\u003e","brand":"Aqua One","offers":[{"title":"25W (18.5cm)","offer_id":43127072849997,"sku":null,"price":28.99,"currency_code":"NZD","in_stock":true},{"title":"55W (20.5cm)","offer_id":43127072882765,"sku":null,"price":29.99,"currency_code":"NZD","in_stock":true},{"title":"100W (24.5cm)","offer_id":43127072915533,"sku":null,"price":34.95,"currency_code":"NZD","in_stock":true},{"title":"150W (24.5cm)","offer_id":43127072948301,"sku":null,"price":39.0,"currency_code":"NZD","in_stock":true},{"title":"200W (30cm)","offer_id":43127072981069,"sku":null,"price":42.95,"currency_code":"NZD","in_stock":true},{"title":"300W (35.5cm)","offer_id":43127073013837,"sku":null,"price":44.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0571\/2180\/0269\/files\/11301.jpg?v=1720515382","url":"https:\/\/simplyfish.co.nz\/products\/aqua-one-glass-heater","provider":"Simply Fish","version":"1.0","type":"link"}