Controlling DHW from Rayburn

[Mike998]

Solid fuel Rayburn Regent on ground floor supplying DHW direct to cylinder (with immersion backup) on first floor, gravity fed from loft.

First floor bathroom being upgraded with thermostatic shower and booster pump (in airing cupboard), with its own H&C supply, hot from surrey flange, cold from loft.

The Rayburn is excellent but can get too hot and boil (and I have to remember to reset the immersion overheat).
If this happens it's going to be far too hot for the booster pump and the shower (stated max input temp 80).

I could use this as an opportunity to add a towel rail in the bathroom fed from the Rayburn before it reaches the cylinder, but I don't think that would be enough of a heat sink, and I've not seen many gravity fed rads, anyone know good sources that are not pricey?

To prevent the cylinder getting too hot could I also add a cyltrol valve on the return to the Rayburn?

Thanks

 

[Goldberg]

To prevent the cylinder getting too hot could I also add a cyltrol valve on the return to the Rayburn?

That would be extremely dangerous and highly inadvisable.

 

[Nige F]

Gravity Circuit rads.......NOT back tappings with 3/4 inch tappings