michael.qian Posted July 21, 2007 Report Share Posted July 21, 2007 Tank is 120-135L, depending on how much I fill it up, right now it's 125L. Currently have a 150W heater and it's on 95% of the time, probably more, its winter in AKL but cold like a few days before, at night the temperature even drops half to one degree. Currently it's set at 27.5, but heater won't stop working until it's 28. Even when it does stop, it turns back on very shortly and stays on for a long time, usually happens at night when the fireplace is going and rooms warms up. Was thinking maybe a 200W? It's more powerful and probably will end up being on less and actually cost less on my power bill? Thanks a lot. Quote Link to comment Share on other sites More sharing options...
jayci Posted July 21, 2007 Report Share Posted July 21, 2007 Probably better to have two 100 watt heaters. Power consumption will be the same whatever you do. But two heaters are better than one. If one fails, there is still the other one to back things up untill the faulty one is replaced. If you had a single 200w heater that failed in the on position you will soon have some hot fish soup. Quote Link to comment Share on other sites More sharing options...
jayci Posted July 21, 2007 Report Share Posted July 21, 2007 also try insulating the back wall and side walls with polystiene and having a tight fitting lid. Quote Link to comment Share on other sites More sharing options...
Ianab Posted July 21, 2007 Report Share Posted July 21, 2007 A one degree drop at night is nothing to worry about, you may even find a bigger heater does exactly the same thing in this cold weather. It's only 2 or 3 months out of the year that it's problem. A bit of insulation on the back / sides will help too. If you can cut down the heat loss by 30% or so, thats less power needed. If you are still worried put another 100w or so heater in there with your 150. Will give you more total power and a backup in case one fails. Cheers Ian Quote Link to comment Share on other sites More sharing options...
richms Posted July 23, 2007 Report Share Posted July 23, 2007 Greater loss from the tank into the room will always make the tank run at a slightly lower temperature then when the room is hot nomatter what the heater is. However the hysteresis on the heater with it on almost all the time may make it slightly worse. I wouldnt sweat it. If it was like my tank and all heaters on all the time and dropping to 18° at about 10am, then worry New 300's in there should make a difference, will see in the morning. Quote Link to comment Share on other sites More sharing options...
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