On Sun, 21 Nov 2004 10:55:54 +0000, Keith G. Powell wrote:



Why is "my" system not fully pumped? Both the CH and DHW circuits are
pumped. No gravity/convection circuits involved.



Your system is fully pumped. What you don't have (like a great number of
older systems) is independant control of the heating and HW.

The system the OP showed us and described is a pumped 2 zone heating
system with gravity indirect HW.

There are scopes for energy savings to be made on these systems.
Whether or not this is worth doing will depend on many factors.

A large one will be how many years of life the existing boiler has left in
it. If it's up for replacment in the next few years it may well not be
worth trying to make improvements just yet.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html