Ground heat is beginning to sound fairly attractive to us if the claimed efficiencies are true because of the high costs and hassels of the other systems.
Ground heat system for us here, will involve drilling a 200!! meter deep well into which a copper u tube is installed lasting many decades. This can be done in a day they say. And since we are on solid granite they dont have to locate the rock first so it could be cheaper. Removal of old boiler and complete installation is said to be about 20,000 Euro but in Finland there is a massive tax deduction on labour used by contractors so cost is reckoned to be about 14,500 and 770 per year to run. Currently the oil bill is 680 per month! The heat pump installers are claiming they can economicly provide a water temperature of 65 degrees at the rated number of kilowatts to drive the old central heating radiaors - this is the part that needs more investigation to prove that for us and our rock and so forth- other people are claiming low temperature radiators or warm air or underfloor heating is required due to the low temperature output of the heat pump :-( Heat pump replacement motor is about 10% of total installation. System supposedly pays for itself in about 5 years - when i expect the pump needs renewing.
We are though meanwhile installing a 9 KW cast iron, glass fronted, wood burning fire insert, with electric fans in place of the totally uselessly inefficient open fire that only currently pumps
all of our existing internal warmth into the atmosphere when used
and produces almost no heat unless you are right next to the thing or the fire is rediculously huge! But the more efficient insert can be used to pump less warm air from the far end of the house into the insert so that the warm air flows to all parts of the house as well or take warmth directly from the insert to other parts of the house. An exciting possibility if this actually works and we can position the air channels. And since the house appears to stay warm, once heated fully, for several days with only a few heaters on, this method alone will work for us providing the neighbours dont go nuts about the smoke!!
At the end of it all the combination of fire and ground heat will mean next owner will have very cheap costs to heat the house which will make it easier to sell i am fairly certain and meanwhile we get the knowledge we are unlikely to be exposed to large heating bills when it already got to minus 23.5 Centigrade before christmas and is going to be colder in February for sure. Almost certainly we got the house cheaper because of the ancient heating system which becomes more scary the more we get to realise how worn out it is!