fishplants Posted June 26, 2011 Report Share Posted June 26, 2011 Just an update, using 2x Jager 150 in our 140L tank seemed to do the trick. The temp is sitting on constant 29 degrees. I now have a reason to dislike winter :< The 'ratings' for Jager heaters are based on quite a high ambient temperature. So if the ambient temperature is lower than that rating, you may need to increase your wattage. Below is a very useful way to calculate size of heater needed, and I have found it to be very accurate. If you don't have anything to measure your room temperature, just use one of those glass aquarium thermometers. Heater calculation table Instructions: Subtract the average temperature of the room the aquarium is located in from the temperature you wish to maintain the aquarium water at. Find the size of your aquarium in the left hand table column and move to the column that shows the number of degrees the aquarium needs to be heated. If the heating requirement is between levels, move up to the next larger size. In larger aquariums or where the room temperature is significantly below the desired water temperature, two heaters may be required. If this is the case, install the heaters at opposite ends of the aquarium to heat it more evenly. Heater size guide Gallons/litres 5oC/9oF 10oC/18oF 15oC/27oF 5 gal/25L 25 watt 50 watt 75 watt 10 gal/50L 50 watt 75 watt 75 watt 20 gal/75L 50 watt 75 watt 150 watt 25 gal/100L 75 watt 100 watt 200 watt 40 gal/150L 100 watt 150 watt 300 watt 50 gal/200L 150 watt 200 watt 2x200 watt 65 gal/250L 200 watt 250 watt 2x250 watt 75 gal/300L 250 watt 300 watt 2x300 watt Example Average room temperature = 15 degrees C Desired water temperature = 25 degrees C Heating required = 10 degrees C Tank size = 100 litres Heater size = 100 watts Quote Link to comment Share on other sites More sharing options...
Vervo Posted June 27, 2011 Author Report Share Posted June 27, 2011 Hello! Thanks for that post! Just to confirm ive worked it out correctly: Average room temperature = 15 degrees C Desired water temperature = 29 degrees C Heating required = 14 degrees C Tank size = 140 litres Heater size = 300 watts ? Cheers Quote Link to comment Share on other sites More sharing options...
Joshlikesfish Posted June 27, 2011 Report Share Posted June 27, 2011 My jager can only stand vertically. Cant be submerged fully. Quote Link to comment Share on other sites More sharing options...
burrowssj Posted June 27, 2011 Report Share Posted June 27, 2011 my 8month old 300w jager has moisture in it Quote Link to comment Share on other sites More sharing options...
GZ_Loach Posted June 27, 2011 Report Share Posted June 27, 2011 well it is winter, you need 1.5 to 2 times the wattage to maintain a good temperature Quote Link to comment Share on other sites More sharing options...
Vervo Posted June 27, 2011 Author Report Share Posted June 27, 2011 well it is winter, you need 1.5 to 2 times the wattage to maintain a good temperature Yea i haven't had this problem before because all my previous apartments where warm as toast! Happy that the heaters are not at fault. Im setting up a new 110L tank, so ill probably get a 200L Heater for that. Quote Link to comment Share on other sites More sharing options...
fishplants Posted June 27, 2011 Report Share Posted June 27, 2011 Hello! Thanks for that post! Just to confirm ive worked it out correctly: Average room temperature = 15 degrees C Desired water temperature = 29 degrees C Heating required = 14 degrees C Tank size = 140 litres Heater size = 300 watts ? Cheers Yep! I run a 300w Jager in my 120l tank, to 28 degrees, and my avg room temperature is 19-20 degrees in winter (thanks to the 4 tanks in a small room!) Quote Link to comment Share on other sites More sharing options...
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