Donegal has great wind resources. There are some suppliers of small\micro wind power systems. Perhaps you could explore using such a system to be used for hot water and heating only. This would mean that for your floor heating, a day without wind would not be much of a problem, provided that your system has an adeqate thermal mass- both in terms of heat stored in floor and in heat source( i.e. sufficiently large hot water cylinder).
I don't have any great knowledge of this area, but I would love to hear from anybody out there who does.