I've been running the unit for 10 days now and I can't say I'm not satisfied with it. I thought you might want to see some numbers.
Using the water for showering and washing some dishes; the unit reheated the water in 01:58 hours using a mere 0.332kWh. That's only €0,06 cents per day. The day was extraordinarily warm for our climate (>28 degrees C), so we have to see whether this will be possible in winter too.
I also plotted the temperature increase and the power consumed over time. Feel like it's an interesting relationship, which I guess shows that the last 5 degrees C the unit is operating at max power (250W + Fan). Wonder how that affects COP.
