I will also add my climate zone: Upper Bavaria, 650m high, rather cold in winter but occasionally sunny. Last January, the lowest temperature was minus 15 degrees, which was manageable, as mentioned, with the geothermal heat exchanger still without electric auxiliary heating, but with fireplace support. 2000kwh for the house size, Cascada, is of course fantastic, does the energy from a ventilation system add to that? In any case, enviable. A brine heat pump would not have been possible for us (plot too small for surface collector, deep drilling at groundwater between 80-100m too uncertain, too expensive), otherwise that would have been my favorite. Gas was not available at the property and the tariff model for the available district heating here is simply absurd for low-energy houses. Since the exhaust air pump is significantly cheaper than a brine heat pump, I invested the saved money in a 7kwp photovoltaic system, which means the house overall produces more energy than it consumes, and energy costs after offsetting the feed-in tariff go down to almost zero (including household electricity!). In hindsight, the all-decisive criterion for me would be: personal thermal comfort. Those who like to sit in every room at 24 degrees in winter with radiant heat should heat water-based. The PTCs probably achieve this electrically with air as well, but that would be madness: dry air, dust swirling and high heating costs. Personally, 20-21 degrees in the rooms in winter plus a cozy fireplace in the living area suit us very well. I like to feel the seasons a bit. But you have to like that and should not underestimate the difference; jumping into a bathroom warmed to 25 degrees on a warm floor in the morning is simply not the same. 20 degrees fresh on cold tiles and then a hot shower, which warms the bathroom and the man, that’s the difference. I like it. When bathing, an IR panel warms us up (radiant heat, cozier than fan heater warmth) and it does not weigh heavily, but an 800-watt electric heater in the bathroom for daily continuous use makes no sense. And I think in a potential house sale this could possibly affect the price negatively.
