Just an update: I was looking for a woodburning stove - just to heat the living area of the house.
I have made enquires ref the 'pellet stoves' - The principal looks good in theory as you can get a grant of around £600 (stove) or £1500 (stove & boiler) in England & Wales via the following
http://www.lowcarbonbuildings.org.uk/home/ In Scotland you can get back 30% of cost up to £4k
http://www.est.org.uk/myhome/generating/types/biomass/
The grants sound good but the cost of stoves etc...are quite high: as a benchmark only:
STOVES:
Eco Prezionsa (stove) 5.1Kw @ £1600 + Vat
Ecofire Freddy Air (stove) 11.8Kw @ £3000 + Vat
Eco Lucrezia Idro (stove & Boiler) @ £3050 + Vat
FITTING:
Flue needs to be done - around £700 + Vat
Installation around £500 + Vat for a stove up to £2000 +Vat for a stove/Boiler combo. (but this EXCLUDES the cost of radiators etc.... another £1500 + vat perhaps for the plumber)
If you need an accumulator tank thats around another £1000
SITE SURVEY:
can be anywhere between £35-£400 depending on location etc.... this would be refunded if you bought a stove. A survey will be needed if you want to apply for a grant.
FUEL COSTS:
Costs of 'Pellet' are around £250-£280 per Tonne (aprox)
These generally come on a pallet comprised of £15kg bags.
The fuel MUST be kept dry.
RUNNING COSTS:
as ever this depends on how hot & for how long you run the stove but as a rough guide:
one 15Kg bag will power a stove for around 20-24hours (depending on the heat required)
This works out as (very aprox) £4.24 per 24hours
There is NO rebate or grant for the fuel.
STUFF:
the stoves are quite efficient. The require electricity (to control the fuel hopper and temperature controls).
You need to empty the ash every 1-3 months (depending on use)
For a grant you need to buy a 'grant approved stove' and use an approved installer.
The Pellets are mostly (but not always) manufactured in Europe and imported to the UK (which raises a few questions about how good it really all is for the enviroment?)
In Scotland you need to apply for a Building warrent
In Engalnd and Wales - the installer should be 'HETAS' registered.
If you are in a 'smoke control Area' you may need to apply to your local building control officer for an exemption from the clean air act!
You are not guaranteed to get a grant!
I have spent a bit of time researching this and my own personal conclusion is that these stoves are OK but I question some of the background Enviromental issues.
The most efficient stove still appears to be a dedicated Wood Burning stove (as opposed to a multifuel stove).
The most cost effective still appears to be a Wood Burner - even having to buy wood (locally of course). You can always make your own 'logs' as well from all your old newspapers & Junk mail (a good use I think!).
I hope this helps anyone looking at the options.
As I say all prices are approximate.... and I guess prices will decrease as the number of users increases.