Nobody did the math, and I can't help myself.
RE: The idea that a 100 W heater can drive your electric bill up by $100 a month.
100W X 24 hours in a day X 30 Days (ish) in a month = 72000 Watt Hours /1000 = 72 KWH.
We have relatively expensive electricity here in Southern Indiana and we pay about $0.13 per KWH. So if a 100 watt heater ran continuously without ever shutting off, it would cost $9.36 per month.
And don't forget that if your one heater is running all the time it might get stuck on and cook your fish this summer.
More heaters will only use more energy until you have enough BTUs to heat the water to the desired temperature. The 250W heater is running constantly, so you probably need at least 400W running constantly just to get up to your (rather high) desired temp. That means you should probably have a couple 400W heaters and let them cycle on and off.
I've been working on the garage problem for a few years now, so I understand the problem. I heat it with gas now and still boost the temp in my sump with electric heaters.....and there's almost 40 tanks, now, too....
RE: The idea that a 100 W heater can drive your electric bill up by $100 a month.
100W X 24 hours in a day X 30 Days (ish) in a month = 72000 Watt Hours /1000 = 72 KWH.
We have relatively expensive electricity here in Southern Indiana and we pay about $0.13 per KWH. So if a 100 watt heater ran continuously without ever shutting off, it would cost $9.36 per month.
And don't forget that if your one heater is running all the time it might get stuck on and cook your fish this summer.
More heaters will only use more energy until you have enough BTUs to heat the water to the desired temperature. The 250W heater is running constantly, so you probably need at least 400W running constantly just to get up to your (rather high) desired temp. That means you should probably have a couple 400W heaters and let them cycle on and off.
I've been working on the garage problem for a few years now, so I understand the problem. I heat it with gas now and still boost the temp in my sump with electric heaters.....and there's almost 40 tanks, now, too....