Excuse me, is my nose in the way?:-) Actually, the colder the climate and those who set their thermostats at a thrifty 65-68F in winter might want to use a beefier heater or two, in case one gives out. If I had an 150 gallon tank (lucky you Scott) I would definitely have some failsafe in place by using 2 heaters. Some recommend up to 10 watts a gallon in winter if the room is kept rather chilly. I think I would play overkill with the wattage, so the heater(s) wouldn't have to work so hard. Bill -----Original Message----- From: owner-aga-member@thekrib.com [mailto:owner-aga-member@thekrib.com]On Behalf Of S. Hieber Sent: Sunday, February 15, 2004 3:21 PM To: aga-member@thekrib.com Subject: Re: [AGA Member] Heater The larger the aquarium the less watts per gallon of heating you need. This is due in part to thicker glass providing better insulation but also due to the ratio of aquarum surface area to volume being smaller for larger aquaria. I used as little as 200 watts to heat a 150g aquarium, which works out to about 1.3 watts per gallon. In a 5g, you probably want at least 25 watts. Since fluorescent and MH lights are only about 35% energy efficient, lots of lighting (3 or 4 watts per gallon) can put a lot of heat into an aquarium. So the size of heater can be affected by the amount of lighting. SH --- WB4CIW@aol.com wrote: > Actually, I was taught the "Rule of Thumb" for heaters > was > 5 watts/gallon. ===== S. Hieber - - - - - - - - Amano Returns to the AGA Annual Convention Nov 2004 -- Baltimore __________________________________ Do you Yahoo!? Yahoo! Finance: Get your refund fast by filing online. http://taxes.yahoo.com/filing.html ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/ ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/