Biomass (Wood Chip) Boilers

Does anyone on here have any first hand experience of biomass boilers, particularly those fired by wood chip?

I am seriously considering a DIY install of a wood chip boiler in the coming months and would love to hear any tips or experiences. I was holding out for the RHI but as we are on mains gas it is looking highly unlikely I'll qualify.

I am particularly interested in wood chip as I grow trees and forestry for a living and could produce 30 cubic metres of seasoned wood chip a year without breaking a sweat.

Space for the boiler and wood store is not a problem, one of the current boilers is housed in a 12x5m outbuilding which has good access.
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  • peat
    peat Posts: 481
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    Woodchip boilers don't generally come smaller than about 30kw which is bigger than your average property would require. Such a boiler is likely to consume annually 100 m3 of chip at 30%mc or less.
  • wuthton
    wuthton Posts: 53 Forumite
    edited 1 March 2012 at 3:54PM
    peat wrote: »
    Woodchip boilers don't generally come smaller than about 30kw which is bigger than your average property would require. Such a boiler is likely to consume annually 100 m3 of chip at 30%mc or less.

    30-40kw is about what I was thinking, my property is a 350 m2 bungalow which was originally farm buildings. It is extremely energy inefficient as it is built in a square around a courtyard so maximising the amount of outside wall.

    100 m3/pa of wood chip though, are you sure? That's a vast quantity, it equates to nearly 10,000 litres of fuel oil.

    Edit: It also equates to about 40 tons of logs.
  • We have a 44kW Guntamatic log boiler with 2000 litres of buffer tank. 3rd year now, it has been excellent. We too have access to lots of free trees, we live in 38 acres. I considered a woodchip boiler as there is less work in feeding it of course, but you need to have a pretty serious bit of chipping kit. I only have a 24hp petrol chipper, which is fine for general garden work, but too small to produce large volumes of chips. I would say you'd need at least 40hp, preferably diesel, and a good make, as they have huge forces thrust upon them.
    A chateau near us uses a woodchip boiler and he makes the chips himself, but just the chipping kit (tractor, chipping attachment) is about 80k£ worth.
  • peat
    peat Posts: 481
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    100 cubic metres (sitka spruce) at 30%mc is about 20 tonnes and can produce around 60,000 kWh of heat
    or the equivalent of 6000 litres of oil
  • wuthton
    wuthton Posts: 53 Forumite
    edited 2 March 2012 at 10:41AM
    We have a 44kW Guntamatic log boiler with 2000 litres of buffer tank. 3rd year now, it has been excellent. We too have access to lots of free trees, we live in 38 acres. I considered a woodchip boiler as there is less work in feeding it of course, but you need to have a pretty serious bit of chipping kit. I only have a 24hp petrol chipper, which is fine for general garden work, but too small to produce large volumes of chips. I would say you'd need at least 40hp, preferably diesel, and a good make, as they have huge forces thrust upon them.
    A chateau near us uses a woodchip boiler and he makes the chips himself, but just the chipping kit (tractor, chipping attachment) is about 80k£ worth.

    Many thanks for your imput, I already have a Schliesing chipper which would just about chip a telegraph pole if I wanted.

    Could I ask what your average consumption of logs is? Your system does sound to be a bit larger than what I'm thinking of.
  • wuthton
    wuthton Posts: 53 Forumite
    edited 2 March 2012 at 10:42AM
    peat wrote: »
    100 cubic metres (sitka spruce) at 30%mc is about 20 tonnes and can produce around 60,000 kWh of heat
    or the equivalent of 6000 litres of oil

    I'll mainly be using Alder, Rowan, Birch and Wild Cherry, which I believe chip down to about 2.5m3/ton when dry.
  • wuthton wrote: »
    Many thanks for your imput, I already have a Schliesing chipper which would just about chip a telegraph pole if I wanted.

    Could I ask what your average consumption of logs is? Your system does sound to be a bit larger than what I'm thinking of.

    We heat a 600m2 chateau, so the log boiler is going most of the time when it's cold.

    That means a small trailer of logs every 2 days, which would mean about a cord per week. (3m3 ish).

    In off season (Oct, Nov, Mar, Apr) probably about 1/2 that.

    It's nearly all laurel (cherry type) not sure if that's what you call wild cherry. It is excellent firewood, bettered only by beech and oak, but oak is only better if not too big and mixed with other softer woods, as it can be hard to light.
  • Greenfires
    Greenfires Posts: 635 Forumite
    Most of the schemes whereby you receive a payment from the gummint require that a registered installer is used, to install approved equipment. Registered installers and equipment suppliers have to pay to be on the list, and get the money back from the jobs they do for the scheme - ie - you!
  • wuthton
    wuthton Posts: 53 Forumite
    Greenfires wrote: »
    Most of the schemes whereby you receive a payment from the gummint require that a registered installer is used, to install approved equipment. Registered installers and equipment suppliers have to pay to be on the list, and get the money back from the jobs they do for the scheme - ie - you!

    Many thanks for your imput but as we are on mains gas it is looking highly unlikely I'll qualify for the RHI so there is no incentive to use an MCS installer.
  • wuthton
    wuthton Posts: 53 Forumite
    pcrosland wrote: »
    Would installing a boiler by yourself effect your insurance? I'm sure they would want it professionally installed.

    It's a fair point that I have considered. There is no legal obligatioan to use a professional installer unlike gas, but definitely a grey area regarding insurance. As there is no danger to the house in event of a fire I'm willing to chance it.
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