I have no idea about those pumps you are talking about (It's not mine I swear), here in Norway we use electricity to heat our homes, well at least I do.
Anyways, that's not the point. I've started to turn down the temperature during the day, since basically everything creates heat during the day. Computer, fridge, tv, people and everything else. During the night you turn the temperature up, and it heats up the house for 8ish hours, then it'll last through the day, unless you live in a tin foil house. It's saved me some money doing it this way, and we're not freezing. And as you all know, Norway is a cold place to live.