Back in March, Swedish designer Kjellgren Kaminsky Architecture and developer Emrahus presented six prefabricated "passive" homes at the Hem & Villa housing fair in Malmö, Sweden, with a second presentation last month.
Here's a paraphrase from Google's translation of the Emrahus home page:
The reason that we no longer need a heat source is that the house has well insulated walls and ceiling ... which retains the heat generated by household appliances, lights, TV set, and people who live in the house.
|Villa Sida Vid Sida
||2 - 4
||1,076 - 2,153 sf