cichlidman2010 Posted August 30, 2011 Report Share Posted August 30, 2011 always wondering how long a heater is in operation for over a 24 hour period. If the tank was in a well insulated room and providing your heater was the right wattage to run your litres, how long would a heater be in operation for over a 24 hour period ? 6 hours ? 12 hours ? Quote Link to comment Share on other sites More sharing options...
spoon Posted August 30, 2011 Report Share Posted August 30, 2011 it would depend on the ambient room temperature and also it you have a 200l tank and a 200w heater the heater will on a lot longer than if you had a 300w heater also lights and pumps add heat to the water Quote Link to comment Share on other sites More sharing options...
cichlidman2010 Posted August 30, 2011 Author Report Share Posted August 30, 2011 would it the be cheaper to run all 300w heaters on 200 litre tanks ? or would it cost more in the end, or the same ? Quote Link to comment Share on other sites More sharing options...
Ira Posted August 30, 2011 Report Share Posted August 30, 2011 would it the be cheaper to run all 300w heaters on 200 litre tanks ? or would it cost more in the end, or the same ? Be the same. As long as the temperature stays the same the heat loss will be the same and the efficiency of the heaters will be the same. Just the duty cycle will vary. You can get a watt meter at The Warehouse for something like $15, it will measure how many kilowatt hours are used over a given period. Plug your heater into it, check again 24 hours later. Quote Link to comment Share on other sites More sharing options...
henward Posted August 30, 2011 Report Share Posted August 30, 2011 that would depend on the temp of water and ambient temp. But i know this Jager heaters: i kow that they turn on ever 10 mins or so, and if your temp is fine they will turn off, almost like a check. Also they turn on of course if there is a sudden change in temp. This is what i tried to utilize wtih my water changer. The checks produce good amount of heat and by adding water slowly i found i saved power rather than big water changes. Quote Link to comment Share on other sites More sharing options...
alanmin4304 Posted August 30, 2011 Report Share Posted August 30, 2011 It takes the same amount of power to heat the same amount of water to the same temperature. Doesn't matter if it is slowly or all at once. Quote Link to comment Share on other sites More sharing options...
bdspider Posted August 30, 2011 Report Share Posted August 30, 2011 But adding a lot of cold in one go will bring down the temp of the water still in the tank more than adding smaller amounts of cold, so Henward's plan would still work. (ie 1 50% water change a week vs 5 X 10% changes) Quote Link to comment Share on other sites More sharing options...
amtiskaw Posted August 30, 2011 Report Share Posted August 30, 2011 You're still going to use the same amount of energy, just over a longer period of time. It works out the same :facepalm: Quote Link to comment Share on other sites More sharing options...
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