"Nick Brooks" wrote in message
...

Will I need two expansion vessels in a closed system design if the
boiler doesn't have an internal one?

One for the heating and flow to direct hot water tank
one for supply to tank

To explain further see schematics here
http://www.eco-hometec.co.uk/Schemat...ms/ECOSCH8.pdf
where two expansion vessels are shown

Also do I need to fill the hot water and heating sides seperately or
will they be connected together somewhere?

mant thanks

Nick

More info. What boiler? What cylinder? Vented with a cold storage tanks
or unvented (pressurised)?




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