Having recently moved house, and no longer having access to a room that was kept at a fairly steady temperature by an oil burning range, I took temperature readings of various parts of the house, both when the central heating was on, and when it wasn't. The difference was sufficient to have me worry that I wouldn't be able to find anywhere with a steady 20 degree Celsius temperature that I find ideal foe most brews, those with real lager yeast excepted.
As is often the case, an excellent solution to this was provided by reading various online forums ~ fish tank immersion heaters, such as this;
Rated at 25 watts, it isn't going to chomp it way through too much electricity, and by placing the fermentation vessel in a builders bucket, filling with water so that is covers the part that has wort / beer in it, you can then drop the immersion heater in this and not have to worry about sterilising it, or unplugging it when you remove the FV for hydrometer readings, etc.
Total cost? I got 3 of the heaters for about £25, and the buckets are about a fiver each. So now I can have three brew on the go, all at a steady temperature. The brew pictured is a Coopers Original Series Stout, attempting to climb its way out of the FV! More on that anon...
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