I am in the middle of a complete refurb of a country cottage. There is currently no central heating etc. I am considering installing an Ofken wood pellet burner system as opposed a conventional oil boiler, tank etc (no mains gas in the area). I hadn't even heard of wood pellet burners until about a week ago, and am keen to gather as much info/ opinion on them as possible.

I like what I have heard so far in terms of their 'green' credentials and economy (v.s potential oil price rises), but am nowhere near being able to make a decision on whether this would be a sensible move. This will be my family home, expect to be there for a minimum of 10 years.

I would really appreciate all thoughts... Thanks in advance!

Look at www.svebio.se click on the English flag for info in English. You will find lots of independent info plus a whole range of equipment and systems. Pellets systems are now available in the UK. Austrian equipment is top of the range but very expensive. There are other systems available at lower capital cost investment and are just as good. Last time I heard, pellets cost about £100-£130 per ton, a cottage could use about 4 tonne for hot water and space heating per whole year depending on cottage size and the weather. Bulk buying of pellets ensures best price and fuel security for the heating season.
Good insulation cuts costs as well.

I don't know a great deal about small pellet burners for individual houses, the projects I work on tend to have 30 units+ run off a communal system with one biomass boiler (100kW+) and sometimes gas boilers too.

On these systems the biomass boilers are often sized to take the base load and then gas (very cheap boilers in comparison) is used for peak lopping and backup, that allows you to run your biomass plant for say 16hours a day and gives you large carbon savings without having to size the biomass for peak load on a February morning.

Biomass boilers don't like being switched on and off and don't modulate as well as gas boilers, they are best run hard, continuously for long periods. Accurate sizing and using a large thermal accumulator/buffer tank helps to do this. A lot of problems with biomass heating systems are actually down to the plant being over-sized.

If you have a highly insulated house with very low heat loads you may may struggle to find a pellet boiler small enough. I understand the Code Level 6 "Zero carbon" Kingspan Lighthouse built on the BRE site uses a 12kW pellet boiler, which I think is 2 or 3 times bigger than they wanted, but it was the smallest they could get. (They fitted the flue a month or so ago, I'm not sure if it's actually ever been run)

If you want to cut heating costs then of course insulation is always the first thing to look at.