central heating & wood burning stove


Postby pinoke » Sat Dec 20, 2008 8:39 pm

has anyone installed a wood burning stove to supplement a gas fired central heating system? (gravity fed seperate hot water and heating circuits through the boiler)

thanks,

pinoke
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Postby Roadweaver » Tue Dec 23, 2008 2:06 pm

Have been thinking of this for a while now!

These are some options I feel that are worth exploring

Add twin coil cyclinder to build into circuit, = space?
Add coiled heat exchanger that fits into cylinder tank = space?

make a coil out of 10mm copper and wrap around outer of expanded central heating circuit pipe, not sure how efficient this would be.

or make inline expansion tube with coiled exchanger inside. :?:

Problem is what type of heat exchanger to use with the wood burner?
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Postby Jack Preacher » Thu Dec 25, 2008 2:34 am

We've just replaced an old fireplace back-boiler with a log boiler and have turned our old, draughty Victorian House [approx 250 sqM] into a hot house...way too hot for us, plus we have more than enough DHW. Plus it looks nice.

The only disadvantage is that the log boiler doesn't load itself so we are pretty much much tied to firing it up in the morning, but the residual heat in the house keeps the place reasonably warm after the last log has burned out.

The boiler we got [28000btu] has only 2 tappings, or ONE feed, but we craftily plumbed in the radiators and the DHW tank with a 28mm Tee. What happens is that the boiler feeds the Hot water cylinder [An old Primatic, or self-venting unit, 90litres or so] if the radiator pump is not switched on. As soon as the pump is turned on the boiler biases towards the heating, but by then the DHW cylinder is hot. This takes 35 minutes to charge the DHW cylinder.

A few problems...make sure the Gravity feed pipe to the DHW cylinder rises gradually with no down turns whatsoever....this can create disturbing rumblings as air and water collide [er...bubbling..]



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Postby mickyfin » Wed Nov 28, 2012 4:17 pm

i am also fitting this to my house but using the foure pip system from back of wood stove . my pump wich supplys the radators will be one floor up from wood burner will this be ok
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Postby htg engineer » Fri Nov 30, 2012 7:46 pm

How are you installing this to supplement your current system? what type of system do you currently have?

Have you bought a twin coil cylinder?

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Postby mickyfin » Sat Dec 01, 2012 4:39 pm

this will be my only heating with use of imersion in summer
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