After a couple of cold and snowy day, the heating came back to life. I guess there must have been something stuck in the pump that came out when it all had the chance to cool down.
I dunno, but I'm happy that it's all working again.
Maybe some of you are interested in seeing the puppies. We will be getting one of them after Easter, but during the coming weekend, we will visit them again and decide which one it will be.