Connecting two extra rads off wood burning rayburn

[darren bastin]

I am GSR but have little experience of solid fuel, your patience would be appreciated. A customer has asked me to disconnect two rads from her gas fired centarl heating and connect onto her wood burning stove circuit. Currently the rayburn feeds via 28mm pipework a cylinder , cut into the cylinder pipework above floor is a heat leak rad situated on the other side of the airing cupboard wall. The gas boiler only does the central heating, the wood stove is only used in the winter, in the summer the immersion does the hot water. Is it possible to cut t s into the heat leak rad (22mm) fit a pump and connect up the two rads ? The integrity of the heat leak remains unaffected.
Currently the two rads (8mm pipe) are the most remote on the heating cicuit and struggle, they would be upgraded to 15mm . She has asked me the viability of this as the current heat leak rad gets extremely hot, as does the hot water and she would like to use the excess. What i am not sure about is how a pump(when running) would affect the gravity ciculation on the flow and returns, when the pump runs it would in a round about way pull on the primaries . I am sure there are reasons why this cannot be done perhaps someone would be kind enough to shoot this plan down. I realise you cannot pump the primaries on solid fuel, and the pump would not be on the heat leak.

 

[SimonG]

What's the rating of the rayburn's boiler?

 

[darren bastin]

I am sorry in have no idea

 

[lame plumber]

rayburn 200/212 sfw are not designed to have rad circuits on them and would fail to cook properly or heat a cyl of hot water as intended, 216 sfw rayburns can have rad circuits added but are you happy with installing a pumped cct and an injector T on the return for it to function correctly? along with the low temp thermostat req by rayburn. If you dont have the experience of these and no manuals, best left alone.

 

[darren bastin]

Thanks , think i will tell them to get a HETAS chap in.