Fermentation Can Heater

As a father of a five year old daughter, I get to immerse myself in playtime with several toys that I would have never touched as a kid myself. It's nice to finally be able to take some of that playtime and turn it in to a usefully homebrew application.


The Easy Bake Oven for instance... If a light bulb can bake a cake, why can't it warm up my fermenters in the winter months?


The Hardware

For this build, you will need a digital temp control unit that allows for heating, otherwise, this build is pretty inexpensive, and works quite well.

From the big Orange hardware store on 11/27 you will need the following:

  • Plastic Lamp Assembly # 078477103180 - $1.19
  • 6' power cord # 756847000023 - $1.14
  • Pancake Box # 050169002933 - $2.19
  • Spade Terminals (optional) # 032076075163 - $1.99
  • Aluminum Paint Bucket # 082474966013 - $4.68
  • Light Bulb... check your closet

Total build Apprx $12.00

Putting it Together

The build itself is quite easy. Using a couple self tapping screws or bolts, attach the pancake box to the inside of the lid of the paint can.

Once you attached the lamp assembly the cord might pinch, so I used a grinder to notch out a small section of the pancake box.

Drill a hole towards the top of the can to allow the power cord to pass through. I also drilled a hole in the bottom to allow a little light to escape so that I could verify the light was on without having to open the final project.

Cut off the receptacle end of the power cord. run your cord through the top hole and separate a couple inches of the cable. strip the end of the wire and attach your spade terminals (if desired).

Connect the terminals to the lamp assembly. Not sure that it matters but at HD, the gentleman on duty told me to attach the wire with the ribbed sides to the gold circuit, and the smooth wire to the silver.

Screw in your light bulb. and attach the assembly to the pancake box on the lid.

Attach the assembly to the pancake box on the lid, screw in your light bulb, and put the lid on the paint can.

You now have what looks like a retarded toaster. But I assure you, the Cylons will be proud.

Does it Work?

Well that's it. As you can see the bottom light hole allows just enough light to escape so that I can verify that it is working without flooding my fermentation chamber with the stuff.

The light bulb heats the paint can enough to raise the temp in my chest freezer.

I am currently using a 60 watt bulb in this one, and it only took a couple hours to bring the temp up from 58 to 68. Once there, the temp holds quite nicely coupled with my digital temp controller.

Enjoy!

Jason is the brains and brawn behind BrewStands.com. He lives in the Inland Empire of Southern California with his wife and kids, and brews a mean American Pale Ale. When not working or espousing the merits of homebrewing, Jason can be found at the Crown of the Valley Homebrewing Society.
bee on 01/28/11 07:19 am writes
PERFECT! My ambient temp of my fermentation chamber has been lingering at 58 or so this winter and this is exactly what I've been looking for.
moeman on 01/29/11 06:28 pm writes
Incredible! I couldn't brew all summer because my house was too hot. Just when I got a freezer chest and temp control for my garage, the temperature dropped, and it has been in upper 40s to mid 50s for the past month in my fermentation chest. This idea is fantastic, and so cheap.
moeman on 01/29/11 06:29 pm writes
The only problem is that incandescent light bulbs are getting harder and harder to find. Better stock up on them now!
Jason Averweg on 01/30/11 10:38 pm writes
Right moeman! Didn't even think of that... I better go stock up.

Push, thanks for posting this. Honored to have a spot on your site!
Eric on 02/04/11 08:16 am writes
Love it!
I'll be adding one of these to my BCS controlled ferm fridge. Sure beats the expensive reptile heating bulbs!
Justin on 02/08/11 03:41 pm writes
Nice, clean packaging! The best part is it is, practically, 95% efficient. Once incandescents are hard to find you're already wired for a power resistor to supply some heat.
Chris on 02/09/11 11:16 am writes
This is great. I built one, although I installed a grounded plug just to give myself an added sense of safety.

It works perfectly. Great, simple and elegant idea.
Scott on 02/12/11 11:49 am writes
Just built this today. Super-easy and the can get's just hot enough to bring my fermenter box up to the right range. Next step - hook it up to a dimmer if I need to control the temp a little more.

great idea - thanks for publishing this!
dave on 02/14/11 04:45 am writes
How long does the bulb last in this? Any exploding bulbs from being too hot inside the small space of the can?
Jason on 02/15/11 08:57 pm writes
I've got my third batch underway with the current bulb still in use. I considered the explosion factor, but figured its already built inside of it's own flak jacket so to speak. That's one of the reasons I added the extra hole, so that I could take a peak in the chamber when I saw the ranco temp was dropping to make sure it was working - if my temp was below the setting, and no light was coming out, I would know that the bulb burnt out or blew up.

To others, it might get too hot, but the outdoor flood lights like Philips Hallogena line, might be around a little longer than the standard incandescents...

I'll be sure to let anyone know if mine blows up.
Sam on 02/17/11 01:24 pm writes
Great idea! I'll be stopping by the hardware store this weekend.
Mindwedgie on 02/23/11 10:53 am writes
What a awsome idea! I may try adding a few rocks (which retain heat) to the bottom and some vent holes (to prevent overheating) to the top.
Keith on 03/01/11 12:22 pm writes
I found that a ceramic reptile heater works great and screws into a light fixture but no light to spoil beer.
Jason on 03/02/11 10:34 pm writes
Maybe, Keith, but the ones I see online are more expensive than this build itself, and you would still need a plate and cord. Cool idea though!
WallyG3 on 03/08/11 12:18 pm writes
I'm going to be putting together one of these tonight. Maybe I'll save the trouble and just throw the EZ Bake in there though.

Nice work Jason!!
Brett on 03/12/11 04:52 am writes
This works great, but I decided to add a fan that I ripped out of a broken xbox 360 and a digital thermostat, and its even better. Mine doesn't look as clean as this though, as I decided to go the cheap route by buying the discounted lumber at home depot.
hark on 03/23/11 06:16 pm writes
love this idea... but I took this a step further and wired it to an old battery operated programmable thermostat. set the thermostat to the desired temp... the light stays on until it hits the temp, then goes off. when it drops below the light comes back on again!
Tim M on 05/31/11 06:04 pm writes
How hot will this get? Can I get it up to 85*-90* for Saison?
Jason on 06/04/11 12:23 am writes
not sure, Tim, but my temp controller has had to shut it off when I was pushing 75. I don't see why it wouldn't.
Chris on 10/05/11 06:41 am writes
This is a cool idea, but has anyone tried using a heating pad?
Tito on 10/19/11 09:22 am writes
Where do you run the chord out the fridge? Did you have to drill a hole. If so, where is the best location?
Great stuff. Will build one today.
Jason on 11/06/11 08:53 pm writes
Tito, my set up has holes/loose lid. Ultimately you would need some sort of hole to run the cord through.

Chris, I haven't tried the heating pad, but I've tried a space heater, and for some reason tripped a breaker switch.

Thanks, gents!
Travis on 01/13/12 12:33 pm writes
I am currently using a heating pad for mine, and it works great at bringing the temperature up (I have it to the side, away from the fermenter). However, its one of those digital types that turns itself off after half an hour, and can't be turned on by my STC-1000, so I'm glad to find this post. I will build this lightbulb can over the weekend. Thanks!
Scottypostal on 02/04/12 03:47 pm writes
I've been using a lava-light base with tin foil over the top, this is way more shag-a-delic.
morbo on 02/06/12 09:41 am writes
well, i wish I would have seen the lava-lamp post before i built the paint can light. but I just wanted to drop a note and say thanks for the idea. I was using a halogen flood light for heat, but have been worried about the light. This paint can light solved that!
thanks!
Sker on 02/08/12 06:41 am writes
Why not just use a hair dryer? No assembly, they have GFIC built into the cord, multiple heat and fan settings, they don't waste energy making light, and they have a fan that reduces hot and cold spots.
Oogie on 02/08/12 07:07 am writes
Uh, there's no wasted energy, the light all turns into heat, too, eventually. And a lot fewer exposed parts to rust/corrode this way, and somewhat impervious to getting hosed down, unlike a hair dryer and a blanket. Unless you NEVER spill anything, have a big foamy airlock blowout or have condensation, of course, then it's OK.
Sker on 02/08/12 07:25 am writes
Well, I guess I could put the hairdryer that I've been using for 15 years in a paint can. It sits on top of my kegs so it's not in the spill zone.

Oggie, you sound like an old retired rat. If we ever cross paths, I might return your growler. Maybe even filled!
Scottypostal on 02/17/12 06:03 pm writes
The lava light uses the same 15w light bulb as the fridge light. The paint bucket seems safer to me, as I have a ply wood shelf, glass shelf broke. I also use a light timer so it's not on during the warmer day time temps.
Jason on 03/22/12 11:50 pm writes
I'm excited to see the enthusiasm of the build. I broke mine out last weekend and low-and-behold the original bulb is still running! Over a year now!
Andy on 04/05/12 01:21 pm writes
How about a 60w Reptile Vivarium Ceramic Bulb. No light emitted, just 65w of heat

Post a Comment

Categories

Archives

2012

2011

2010

2009

2008

2007

2006

2005

2003