3-4
get 3-4 heaters if you can with the same reason as stated by fishmanty. Likelihood of 1 failing is more than 4 simultaneously. Unless you want to get an external controller like a RANCO thermostat with 1-2 300W heaters attached to be controlled.
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If people don't die, it wouldn't make living important.
And why do we fall? So we can learn to pick ourselves up.
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