Castor-troy
(i) Endless good pellet boilers out there, a quick tinternet search should suffice.
BUT
Here in NI the problem appears to be;
(i) the quality of pellets available/supplied ( turned to mush/bridged in the hopper)
(ii) the dry storage of the pellets (atmospheric moisture??/see above)
(ii) the actual installation of the boiler & FLUE.
I know of three locally, all with problems,
(i) flue too short, back draught/down draught caused a fire, insurance claim resulting
(ii) flue too short, eratic in performance, requires constant "coddling", (architect specified on a new build).
(ii) a blinking expensive Hoval, professionally installed too,(architect specified as above) ripped out inside of 3 years and oil installed, gave endless trouble reason not specified but I would suspect the quality & storage of the pellets, since the hardware should have been 100%
Food for thought
Cheers
M

We have a Scotte OPOP wood pellet boiler. Rated at 30kW but modulates down to whatever the heat demand is. Very simple to operate. No problems apart from the electric heater element required to initiate the burn. Previously these were quite tempremental (e.g. one would last 12 months and the next 12 days!). However they have now changed supplier and the newer models are fine (haven't had to change the last one yet).

Not technical enough to comment about flue design/installation - our seems to be fine, certainly no tinkering required. Presumably our installer followed the manufacturer's instructions. The flue goes vertically up from the back of the boiler to just above ridge tile height. No bends apart from one immediately behind the boiler where the flue outlet changes from horizontal to vertical. Total length approx 5 metres.

Our pellet supplies have been good. Sourced from North Wales (we live in South wales). There is some dust of course due to attrition but this doesn't cause feed or burn problems. We have a plastic silo from JFC in Ireland. No problems with damp - appears to be impervious to moisture. Feed mechanism is via Archimedes screw device rather than vacuum transfer.

thanks for the info. I think the windager looks like what were after. it looks like the baxi bioflo whick is about £9k inc vat(quick google search). was hoping not to have to spend quite that much.

we plan to have bagged pellets delivered. store so much in interal hopper and the rest in a waterproof outbuilding (still bagged).

we have a local supplier in who can supply them but has advised to avoid the recycled pellets as they often break down in the hoppers causing the dust to settle at the bottem and clog the feed system.

thanks again for advice

Caster-troy

We have a a Calimax Twist 50/50, older model now no longer available (they do an 80/20 now). Haven't noticed any issues relating to draughts etc. We bought it second hand and installed it ourselves and it appears to function as it should. It has a number of safety functions which all seem to function as they should. The main issue appears to be the quality of pellets. The first lot I bought were 'economy' and were bad! Lots of clinker in the grate which prevented it lighting properly. There was also quite a lot of dust but this didn't seem to affect the stove. On close inspection, some of the pellets contained bit of plastic. (@nigel) we also ended up with lots of nice plastic bags, which we managed to use in the kitchen bin. The second lot I bought were from someone more local (just over the border in S Wales.), and though more expensive, were supplied in paper bags, and burn cleanly, with no clinker in the grate, just very fine ash. As for storage, Where we keep the stack of bags is not completely free of damp, however, as the hopper that hold 40KG of pellets is above the firebox of the stove, the pellets are essentially pre warmed before they are burnt. If you want to know who our suppliers (bad and good) are, pm me.