Hello there,
Iwas just thinking about going out to the garage to fill up the hopper on my gerkros boiler, and saw your post.
We've been running it for about the past 7-8 months I suppose, and I'm just about at the end of my first 3 tonne load.
We have been in the gaff for about 6 of those, but had it running before we moved in.
At the moment, I'm trying to figure out how much I'm using too.
Had the plumber in recently as there was a problem with the distribution from the manifold for the underfloor heating, and he said to just leave it on for a couple of days, and see how it went.
I did that and having it run for those couple of days did the job, nice n cosy now.
Anyway, running it constant doesn't really seem to use that much more as its a modulating boiler, or so they say, so have filled the hopper a couple of times since.
I think that the hopper is 250 or 300kg, so that would mean I should get 12 fills approx. from the three tonne load.
So that means if I'm filling it once a week, I will get 12 weeks, or three months out of it, but that would mean three solid months of it being on! Which unless it gets really baltic, won't be happening.
Last load, as I was saying, lasted about 7-8 months, but not as hot as it is now.
So in fiscal terms, that means I'm looking at 2 X three tonne loads per annum, or one six tonne, at around E180/tonne, meaning E1080/annum, plus VAT I think, so around E1200/annum, or E3.28/day. The same, but using oil, would be 2 fills of oil at E700/1000L, which would be E3.83.
I still have to wire up the controls for the UFH so expect there to be some reduction due to increased control, and all of the rooms are at about 22.5, so it's a bit much really. Wanted to have so that it was uncomfortable for a while so I could complain about it.
Also, the house is a dormer, three bedrooms downstairs, two up, think its about 225 sq M, and now, after running it flat out for the couple of days, am currently running it for about 16 hours/day, in two 8 hour slots.
Hope that helps, it helped me...