Top critical review
Not effective for frost protection and wastes energy
on 9 April 2015
I've tried 2 of these and they didn't work properly. The heater keeps switching on and off for about 10 seconds even when the ambient temp is above 20C. Similarly, when it gets cold, the heater switches on for a few seconds then off again. Setting it at the 'frostguard' setting allows the temperature to drop below freezing and doesn't maintain 5C as in the instructions. Turning the thermostat up to a higher setting does keep the greenhouse a bit warmer but still allows it to drop below 5C while using more electricity unnecessarily when its warmer. Now looking for an alternative . . . Pity, because this ought to be good in a compact space.