Matt,
Why not just use a brew belt that wraps around the outside of a carboy or
bucket. At about $20, its cheaper than a reliable aquarium heater and does
not have to be placed inside the must.
Al

"Matt Shepherd" > wrote in message
...
> Following the good advice found on this NG, I went out and invested in an
> aquarium heater for my primary. Cheaper than running a heater in the room
> all winter. Plugging it in and getting it in there, though, necessitates
> having the lid a touch open, and I'm wondering if that should be a matter
> for concern.
>
> For some reason, the rosé I'm working on now is fermenting very slowly
(from
> kit, ten days now and the SG has dropped from 1.070 to 1.015, but not low
> enough to rack yet). My concern is obviously that the fermentation might
not
> be vigorous enough to push the oxygen out.
>
> I'm contemplating making a notch in the side of the lid for the cord so I
> can snap the lid shut and seal around the cord with poster putty or
> something. Am I worrying too much?
>
> Any innovative tips on how to use this heater in a carboy while preserving
> airlock integrity?
>
> Thanks all,
>
> Matt
>
>