On Wed, 10 Mar 2004 09:19:47 -0000, "IMM" wrote:




Terminology has now settled.

Yes and no. You still see the terms used loosely.


A system boiler has a pump and pressure vessel
inside, so is only used for a sealed system - some may have a built-in
pressure loop, others do not. You just connect it up and still have to
install 3-way or 2-way zone valves. A "heating" boiler has no pump or
pressure vessel and can be open vented or sealed. You have to install all
the relevant pumps and kit yourself externally.

The terms heat bank and thermal store are still mixed up too:

- A heat bank uses a pump and a plate heat exchanger for the DHW take off.
- A thermal store has in integral immersed coil.

A heat bank can also have a coil if it's an indirect one - in order to
separate the bulk water from the sealed primary


..andy

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