wood burner back boiler

[carljon]

Hi thinking of fitting a couple of rads to run off my wood burner back boiler. Its only about 3 kw. Any hints or tips that might be usefull?I'm not doing anything else with it at the moment, will it still need a heat sink?

 

[ecowarm]

Pipe the rads so they work on gravity and you have your heat sink, dont forget you need a f&e tank, float & overflow able to cope with boiling water

 

[carljon]

Thanks for the reply. I was going to use a pump for the flow and return, don't I need this now. Also the pipe runs are at ceiling height, dropping down to the rads. Will this work with just gravity?

 

[Jimbob]

No it won't, anything coming off solid fuel needs to run of gravity circulation, the only way you could do it (technically), is run it into a open vented heat bank then run a pumped flow and return off the heat bank. You would still need to incorporate a heatleak. The heat bank would need to be around 150 ltrs (I think), so hardly really worth it.

As a warning, I strongly advise trying to cut corners as it can do a lot of damage if done incorrectly. Solid fuel can easily melt soldered joints if system doest work correctly.

 

[carljon]

Thanks for the advise. Does anyone have a schematic for a gravity system. The back boiler only has a flow and return inlet and outlet. Do the rads need to be above the boiler for the gravity flow to work, I take it the higher, the more efficient?