Gravity fed combi

[europhil]

I'm trying to figure out a problem for a guy with solar heating that connects through a cylinder and then to the DHW inlet at his combi.
The warm water from the solar panel is a closed circuit which warms the water in the cylinder through a heat exchanger, the water in the cylinder is static, it warms up, then there is a second heat exchanger that's mains fed to the DHW feed to the combi.
I'm thinking that it would run more efficiently if i fed the combi by gravity using what is static water at the moment, therefore doing away with the second heat exchanger.
i know it looks pretty complicated, so let me ask the simple question.
would the DHW on the combi work ok gravity fed rather than mains fed?
Other than that it'll possibly be an unvented cylinder setup.
i'm looking at all the options, so any suggestions would be appreciated.
thanks.

 

[cr0ft]

Are you a plumber?

 

[lame plumber]

doesnt sound like it, the set up described sounds reasonably installed and safe and best to leave well alone.

 

[snowhead]

Google Thermal store

 

[hammers4spanner]

probably not a combi more likely system

 

[lame plumber]

main thing is it sounds like a well set up thermal store whatever the boiler and needs to be left as is imho

 

[hammers4spanner]

question for the OP how much more efficient do youy think you can make it??

 

[Whyme]

Am i being thick, i dont understand the 'problem'.

 

[hammers4spanner]

looking to make system more efficient

 

[Whyme]

Mmmm good luck.