placement of rad flow pipe in gravity fed system

[Lotarogg]

I have a back boiler on solid fuel stove. It does a good job of heating my water cylinder but I want to take a spur off to feed rads. Question is when do I take it from my best guess would be after the flow into the cylinder a few inches up on the vent pipe? It's going to be messy so want to get it right first time.

thanks

 

[Norcon]

It might not be worth the hassle on a low output stove.
A simple method would be using a coil in the cylinder if one is fitted similar to a solar heat dump arrangement.

What do the MI's recommend?

 

[Lotarogg]

Thanks for reply Norcon. The thing is the stove heated the cylinder and the rads before I gutted the house, now I can't remember the configuration of the pipes. I've got the stove heating the water in the cylinder via the coil but now I need to take a pipe off the hot flow for the rads as it was before I ripped it all out. If I place the rad pipe before the intake to the cylinder I think it will mess up the gravity cycle as upward pressure of the hot water could go down the rad pip before it gets to the cylinder intake. So I'm thinking take the rad hot water just after the cylinder intake obviously stepping down to 15mm.

Also I need the rads connected as a heatsink as when the fire has been going for a bit and the water in the tank is hot it starts to boil.

Cheers