/ Wood Stove/Combi Boiler
Unfortunately, there's not a great deal of info out there on how to connect a wood-burner-back-boiler into a system currently operating a combi boiler. Does anyone have any expereience of installing a system like this?
Also, we've calculated that to heat the room, we need a 5Kw stove, how much larger should I go to allow for the water heating?
A combi-boiler doesn't have a water tank as you know so I don't think it will be easy.
You would either get a new system in parallel with a hot water tank or get a simple system where your fire connects direct to a couple of radiators. this is not ideal as you want to use the heat from the fire at other times and for hot water.
Our stove does 3kw to the room and 10 to the water. This is enough to heat a three bedroom well insulated house and hot water without lpg etc unless it is below 2degrees.
Presumably the central heating loop is closed? In which case I think there are regulations about having uncontrolled heat sources connected directly. Possibly it could be done indirectly, but may be more trouble than its worth.
Also, you would be stuck with heating the radiators (or a heat dump) whenever you had the stove on. Depending on how you use your house this might be quite inefficient when you could have a smaller stove comfortably heating just the room you are using.
A cheaper (and more controllable) alternative might be to install vents and fans between rooms so that you can move hot air around directly.
dont forget you need a bloody good supply of cheap wood, that may well need chopping seasoning(up to yr depending on wood)
Also depending on your setup dont expect to come in and the house to be warm in 30 mins time unless you go for a more expensive setup.
Also cost can be prohibitive as you need a higher grade 904 liner ( stove takes more heat out so more plating out of crap due to lower flue temps) You may need a thermal store,extra tanks and controls then installation costs etc
Its a good idea but there is a fair investment and then the wood side of things to consider.
Wowsers, thats a nice big room youve got - 5kW is pretty high. We have a multifuel stove (Woodwarm brand) to heat the whole house, via a thermal store/accumulator tank. Such tanks are usual with stove + radiator installations, since they help balance out the peaks and troughs in heat you get with a stove. We could hook up a regular boiler to the store too (and solar), but havent yet.
There is plenty about this on the internet and you do need to read about in order to sort out heating and hot water in the places you want, when you want.
Last time i looked, it was difficult to use a tank/store as a feed to a combi (using the combi to "top up" the heat if needed), since combis are made for cold water feed only. If this has been resolved, or your combi can take warm water, then that would be the most straightforward approach*
*I am not a plumber and there is almost always a million different options when it comes to plumbing a house. Good luck!
PS If David Hooper were here he would add his tuppence, he loved his Clearview stove.
That's interesting, I would be very interested to know how that installation was done and how it works!
Google dunsley neutraliser.
Obviously Im not the OP but thanks for the full reply. Our system still isnt quite right for us and there's some useful stuff to mull over...
hmmmmn... goes away looking thoughtful..
Q: How do you control overheating/boiling of the hot water or central heating given the stove is an uncontrolled heat source?
Q2: Presumably this set-up (as I read it?) means the stove has to be fired up and running all the time in winter - including overnight?
I'm intrigued by this bit. I'd think this would be difficult for most people. Even using scrap wood, (this would probably be easier in built up areas,as in rural areas anything flammabke is immediately scavenged), it'd be almost a full time job collecting and chopping wood on that scale. I'm impressed, (and very jealous)!
The stove is only running during the day, had on until 10pm last night and house is still warm this morning(17C right now at 8am)... if no-one in through the day it won't be running, at weekends it's on all day... yeah it can be a bit nippy sometimes when we get in on the evening in a sub zero winter but it warms up pretty fast.
It took a couple of years for us to get organized and to work out the most efficient way to use the stove, and all the elements the keep it running, but now it pretty much runs like clockwork. It does involve some work and you don't always get the same even heat throughout the house... upstairs is usually ok but it can vary downstairs... obviously the living room with the stove in being warmer than kitchen/dining room etc
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