Temperatures are dropping meanwhile (especially at night) but I want to try cultivating certain suitable greens over the winter nonetheless. So, in order to keep the greenhouse frost-free, I ordered a greenhouse heater – this product in particular with about 300W of power. You can purchase it for around € 60,- if you’re willing to invest a little time surfing the net, and so far it works.
This model is designed for greenhouses of about 4m², but it seems to work sufficiently for my 6m² greenhouse as well. It burns normal lamp oil (the paraffin version, not the organic-stuff), which is cheap and easily obtainable everywhere, lasting for about 6 days with 4,5 l (more if you only use it intermittently).
At the moment, I only have it running at night, when there’s danger of frost and leave it off over the day.
While it absolutely does what it’s supposed to do (it keeps the greenhouse frost-free), I found that it’s a tedious fiddling to adjust the two wicks so they don’t either just self-extinguish and on the other hand don’t produce overly much soot. You absolutely must invest some time to find out an appripriate setting. Rating: 3/5 stars.
After several tries and thorough testing: Unfortunately, this contraption gobbles wicks, farts petroleum and nearly dies out by itself every morning. Sadly, I have to change my former rating to 0/5 stars. Not recommended, it’s a pity.
Example prices and links (de):
- Heater (on Amazon): https://www.amazon.de/Bio-Green-Paraffinheizung-Warmax-Power-schwarz/dp/B002UKPX5A
- Heater (on eBay): https://www.ebay.de/itm/334553239301
- Lamp oil (at Obi): https://www.obi.de/gartendekoration/flash-lampenoel-1000-ml/p/8588766