I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

[Mr.B]

To be honest I've always thought unvented cylinders went hand in hand with System Boilers not gravity systems. The installer who was round here recently made that suggestion and he's a pretty switched on bloke. But, like I say, it's always been the de facto suggestion - or al least I thought it was.

Over the years I've read plenty of Tony's posts.


And that's all I shall say.

 

[MNW67]

Tony you cannot be serious.
What you are suggesting, can be done but good chance gravity circulation my not be possible with indirect coil in UV cylinder.

This scenario highlighted in a recent thread. Gravity circulation in UV cylinder almost non existent

I think there's been a bit of confusion in terminology. I think it's a fully pumped system, both radiators and cylinder. When OP said gravity, I think he meant F+E open vent.

 

[Mr.B]

Correct

 

[Agile]

When I say gravity fed I mean supplied by gravity from a header tank. Not pressurised and sealed Danny.

Not that the cylinder heating coil is not pumped!