woodburner question?

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seanoo

hi ,firstly i am new to the forum so i would like to say i to all. i have a question regarding my woodburner heating system. i have a hunter herald 14 running 8 rads only and no hot water. the last radiator is at the end of the house upstairs and right next to the airing cupboard. in the airing cupboard i have a 200 litre mains pressure electric only water heater. my question is, is there a reason i cant rip out the water heater and replace it with an unvented indirect cylinder and just plumb it in as an extra rad on the end of the line?? even if the water doesnt get up to full temperature surely it would raise it quite a bit so possibly reducing the elecricity needed by the immersion. i have the cylinder as a freebee so would like to hea what you all think. i know i can put it on its own gravity circuit and have the rads separately pumped but this would mean major destruction in my house!!! all the best sean🙂
 
Hi Seenoo

You cant connect an unvented cylinder to a uncontrolled heat source (wood Boiler). Building Regs G3

However ypu could put in a vented cylinder or a thermal store.

Eco
 
hi eco, thanks for the reply, i am in france so building regs dont really apply here and as its the end of the line it would not be able to boil. also here everything is on mains pressure because they dont seem to use storage tanks here. regards sean
 
hi seanoo, our regs might not apply to you, but im sure the french ones would.
it does sound like a great idea, however it just should not be done, its almighty dangerous. have a google on your idea and im sure you'll change your mind.
 
hi migoplumber, isnt the electric heater that i have just as dangerous? what if the thermostat failed and it boiled the water surely the safety valve would just blow (hopefully!!) . on the unvented cylinder it has the safety valve protection and also it is on the end of a gravity circuit of 4 big double panel rads
and two smaller ones without trvs so even if i have a power cut i cant see it boiling?? regards sean
 
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everything is safe till it goes wrong - not many do, but when unvented does, it goes with style, why take the risk of putting an uncontrolled heat source into it ? if its against the regs here, then there must be a reason. (i was hoping for a reason other than a suited bloke sat in his office bored !)
 
ay yes the good old exploding cylinders.

i want a video on u tube with a solid fuel fire sat 1 metre away from unvented cylinder and watch that go into overload - if i had the manly bits required i would make it myself, i'd probably bottle it just after lighting the fire.
 
cheers migoplumber for your reply. i understand what your saying but still cant see the difference if your indirect cylinder has a safety valve. i know the dangers ( i've seen the damage a tiny oversink single point water did to a bakery
a few years ago) but in my case i cant see a way it can overheat as it doesnt boil up the rads that are there already. sorry if i sound argumentative, i'm really not🙂 but i cant see how my 12 kw woodburner could boil up 150 litres of water and all the rads. regs ,regs, regs, nothings easy these days!! best regards sean
 
ive got an image in my head of plousane sitting ontop of a cylinder as it exits the roof, and him saying "theese ees how theee french do it", no insults intended plousee
 
seanoo said:
hi migoplumber, isnt the electric heater that i have just as dangerous? what if the thermostat failed and it boiled the water surely the safety valve would just blow (hopefully!!) . on the unvented cylinder it has the safety valve protection and also it is on the end of a gravity circuit of 4 big double panel rads
and two smaller ones without trvs so even if i have a power cut i cant see it boiling?? regards sean
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The electric heaters will have built in high limit thermostat built in also,so if normal thermostat fails,the high limit will kick in an cut power to heating element

As said before, the safety devices fitted on an appliance are not there to be used in normal conditions and should be discounted when thinking how a system will operate,when thinking about your stove you should be able to control safely, without the use or thinking about having to use the P R valves or any other safety devises,in this instance,with a uncontrolled heat source,you can not.
 
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