Hello Mora,
Do you have Wal-Mart or Home Depot or any other American discount retailer near you in Finland? You may be able to get them to ship a complete heater to a store near you. Electric heaters here in Minnesota are pretty cheap Wal-Mart has two for under $25 US. I'm not an electrical engineer but, aren't electric heaters just big resistors? Could you hook two 220 v elements together in series to make it work at half the voltage? WiKipedia has the formulas if you search electrical resistance. It's too early in the morning (7:00 am) here for me to figure out. That's all I can think of to do. Good luck with your project.
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