Knut, and others with PHEV Ioniqs in cold climates: I am very curious about your long-term experiences with your vehicles in cold climates. Have you continued to be happy with them over the long haul? (It is time to replace my 2003 MT Honda Civic Hybrid, though I love the car, and am considering an Ioniq PHEV.)
I've had my phev Ioniq through one winter so far and the short answer is - yes, I am very happy with it.
I have heated seats but no heated steering wheel. I think a heated steering wheel would be great but it is not offered here in the US. The heated seats are good. I find the low setting to be sufficiently warm.
The rear defogger strips are fine. The front windshield defrost sometimes seems a little slow, maybe because in EV mode the engine just idles to generate warmth?
After reading some info on lithium ion battery technology, I made a choice not to recharge the phev battery when the temperature is below freezing. Since I don't have a garage this means I drove a couple months in the winter mainly in HEV mode. No problems with that, but the fuel efficiency obviously drops in the winter. The coldest temp we had this winter was about -10 deg F. At those kinds of temperatures the car limits you to HEV mode.
My previous car was a Honda Civic also, 2002, very reliable. So far I am very happy with the Ioniq. I love the advanced phev technology, efficiency, value, design, and electric driving. Ask me again in 15 years for a long term opinion.