Weather in Finland is very much affected by the wind direction and placement of the large high and low pressure areas. If wind blows from the arctic then it is cold, if wrom south, then it can be quite warm even in January or February.
Last summer was very warm and there was two longer periods of over 26 deg celcius. This summer at our location there has been no single day over 26 deg celcius official measurement!
Last autumn and winter there was quite big and long lasting eruption of Bardarbunga volcano in Iceland. It released masses of sulphur dioxide to athmosphere and nobody knows if that may have some climatic effect at least locally.
In general there is lot of interest in air-to-water pumps in Finland but we are missing budget pumps form the market. Also there is growing interest in R290 because of very low price and wide availability. Only minus is the flammability, but that risk can be minimized.
Usually DIY folks use plate exchangers in floor heating return line and for example some off the shelf R410A inverter and indoor unit connected as a 'dummy' and its sensors separated.
Domestic water heaters like this project are more rare. Actually I can use this for the floor heating as well, but on the other hand it is not needed until ambient temp drops to near zero.
I have read some good builds from this forum and found lots of good information!
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