RHI Wood biomass boiler

Marronscar

New Member
Thanks for the reply. I spoke to the installer today who said it was a complicated set up to put anti freeze in, water has to be checked quite often, meter needs changed etc so thats a no go. Do you have a batch boiler?
 

A1an

Member
You could use a Glycol based inhibitor which will give you slight protection against frost. Perfectly compliant with the RHI
 

f0ster

Member
we have installed a couple of hundred biomass systems with a mix of pellet, chip, and log, the most effective solution is chipping your own logs but they need to be at 20% moisture with a max of 25%, ours were mainly Austrian made boilers, the only blockages you get is if there is a piece of chip about 6" long that covers the optical sensor, this stops the boiler because it thinks it has enough chip. A log boiler has the fastest payback but you have to work for it loading it up with logs all the time.
 

f0ster

Member
we have installed a few prosat log boilers (rhi approved) they come in sizes up to 130kw, they are basic but reliable and they do what they are supposed to. I have been thinking that they would happily burn wood chip if you could only get the stuff in to them with some sort of automated feed system, and the trick is knowing when it has enough and when to feed in more. the KWB powerfire boiler has an optical sensor that looks right across the burn chamber be it full of smoke or flame. you would then have a chip boiler for very little cost. being a gasification boiler the high temperature takes place in the chamber below.
 

Half Pipe

Member
were looking at a 200kw plus boiler to run 4 houses plus a large farm house, also heat the workshop.
we may need scope for 2 extra properties which realistically will happen in 10 years time

we are looking at a log boiler the idea is 5-6ft lengths of timber filling it 1ce a day or twice in winter

we have had the odd quote bet they seem fairly deer

boilers at 15k
controls etc £500
5m of flue £1500
10,000 litre accumulator tank £7000
pipework to connect the two £2000
pumps £970 main pump and shunt pump
heat meter 50mm £865
header tank + pipework £1000
installation etc £2325
RHI application £695

were also needing 85m of insulated 50mm pipe DN50 at £74 a meter £6300
50 m of insulated DN 40 pipe at £50 a metre £2500

then there's heat exchangers in every house and plenty other stuff £70 a 40mm connection £100 per 50mm

do these prices seem high or is it just us?
also what are the pros and cons of different boilers we've looked at glen farrow, e classic, dragon,
also are the RHI payments realistic of what you get, there claiming 15-20k per year?
if you install that system, I would doubt I the 10,000l buffer would keep a load like that going for long after boiler has burnt its fuel, would probably help I boiler fueled just before peak demand for heat.
a 200+kw batch boiler will hold all of wood, like said above you ideally want to load it with a machine of some sort.
as it needs filled even on those days your very busy, unwell etc unless you keep oil for those days, that's what we do, oil doesn't do much here, but is handy.
 

dannewhouse

Member
Location
huddersfield
if you install that system, I would doubt I the 10,000l buffer would keep a load like that going for long after boiler has burnt its fuel, would probably help I boiler fueled just before peak demand for heat.
a 200+kw batch boiler will hold all of wood, like said above you ideally want to load it with a machine of some sort.
as it needs filled even on those days your very busy, unwell etc unless you keep oil for those days, that's what we do, oil doesn't do much here, but is handy.
ye we realised/ were advised by many that 25,000 litre upwards would be a good investment a chap with a very similar system had 20k litres and he said only change he would make would be more storage! so we are thinking a 30k litre ish tank
I know what you are saying about manual feeding, I think we might make bundles ie fill tines with as much wood as we can then tie them up with a few bands so a loader can lift a lot in at once but probably still have loose stuff for topping up.

we would still have gas but the other properties wouldn't, there's me and dad so either can fill it and we have cattle to feed anyway so its not too much of a problem but even busy times in summer we cant get say combining early in the morning any way. they sized our usage as rougly 50ton of wood per year (I think it was less but we rounded it to 2 artic loads) but that probably is 250kg per day in winter
 

dannewhouse

Member
Location
huddersfield
at a rough gas comparable price of 2.7 pence per kwh = £20.25 our house has no insulation and is massive and uses about £5 gas on the worst winter days so I don't think this is unrealistic (I know losses haven't been allowed for yet but seems about right)
 

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