Need to downgrade heater

[Glass Algae]

I stupidly bought 100w Jager eiheims for my fluval evo. I've been using it for a few months and use the spare to heat up change water.

It looks horrendous horizontal in my display and I would like to downgrade to the 75 so I can stand it up in my either in the corner of my display or in the attached sump.

My question is, if I calibrate the new 75 w heater in a 5 gal jug will that calibration be accurate when I switch it out in my Fluval Evo. Or will the difference in water volume screw up my calibration.

Ty in advance

 

[Biglew11]

The calibration set the thermometer temperature. It doesn't matter how much water is around it as long the heater is enough to heat the water it is in.

 

[Wiskey]

The calibration set the thermometer temperature. It doesn't matter how much water is around it as long the heater is enough to heat the water it is in.

+1
Are you sure that 75W is needed though? How big is your Evo? I have a 3G with a 7.5W heater which is sufficient in my case, and I had a 10W in a 5G. I had a 50W in a 10g that was in my garage and dealt with huge temp swings.

Whiskey

 

[Glass Algae]

+1
Are you sure that 75W is needed though? How big is your Evo? I have a 3G with a 7.5W heater which is sufficient in my case, and I had a 10W in a 5G. I had a 50W in a 10g that was in my garage and dealt with huge temp swings.

Whiskey

Oh yeah I'm sure I can go down to 50w with the eheims I have had good luck with the larger ones and with how varied the temp is here in Oregon I prefer it have to do less work as it's usually on the chilly side. The 100w is just ridiculous big.

 

[samnaz]

75 watts is plenty for 13 gallons.