Quick Heater Question

[CooperS]

Hi,

I just bought a Hydor Theo 25 W for my 2.5 gallon tank. So in order to do a water change, I unplug the heater, but then how long do I wait until it is safe to take some water out?

Also, in general, how high should the water be on the heater, it just shouldn't be touching the glass part, right?

Thanks

[bettaluver14]

once the heater is unplugged i usually just wait like 5mins... and what glass thing are you talking about?

[Perseusmom]

To be extra safe I wait 20 mins after I unplug it. There should be a line on the heater that the water level should come up too.

[CooperS]

Hm, well there's a black plastic part at the top which has the dial with the temp control on it then a glass tube underneath it. I just heard if you have the glass part out of the water it will crack, because of the temp.

[CooperS]

@Perseus, oh yes I saw the manual that came with it talking about a line, but I couldn't find it. But I just checked again and I see it, it's a bit hidden lol. Thanks both of you :)