Peter Woodhouse wrote:
I'm considering a WB combi boiler to replace an exisiting boiler.

Could someone tell me the basic differences between the various series that
they manufacturer.
....

24i Junior

compact lightweight unit different from:

24i
24CDi BF or OF or RSF (or are these the same - different flues?)

Yup, flue options. I think the the i and CDi are mechanically similar
but different controls (clock/programmer?)

The latter types are 'conventional' combis having one gas-water heat
exchanger and a diverter valve & (plate type) water-water heat
exchanger for DHW.

The Junior has no diverter valve or plate exchanger, but both primary
and DHW are heated in the gas-water exchanger assembly. Someone (Ed?)
said Ferrolis are like this too.

On Wed, 29 Sep 2004 00:41:09 +0000, John Stumbles wrote:

Peter Woodhouse wrote:
I'm considering a WB combi boiler to replace an exisiting boiler.

Could someone tell me the basic differences between the various series that
they manufacturer.
...

24i Junior

compact lightweight unit different from:

24i
24CDi BF or OF or RSF (or are these the same - different flues?)

Yup, flue options. I think the the i and CDi are mechanically similar
but different controls (clock/programmer?)

The latter types are 'conventional' combis having one gas-water heat
exchanger and a diverter valve & (plate type) water-water heat
exchanger for DHW.

The Junior has no diverter valve or plate exchanger, but both primary
and DHW are heated in the gas-water exchanger assembly. Someone (Ed?)
said Ferrolis are like this too.

And "Fer" which is a badge of some Ferrolis.
I suspect the down side is that due to hot spots you could get a big
limescale build up in the DHW heat exchanger.
I guess for a soft water area it might be a good choice, although ideally
you would then want a s/s heat exchanger.

--
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

"John Stumbles" wrote in message
...
Peter Woodhouse wrote:
I'm considering a WB combi boiler to replace an exisiting boiler.

Could someone tell me the basic differences between the various series
that
they manufacturer.
...

24i Junior

compact lightweight unit different from:

24i
24CDi BF or OF or RSF (or are these the same - different flues?)

Yup, flue options. I think the the i and CDi are mechanically similar
but different controls (clock/programmer?)

The latter types are 'conventional' combis having one gas-water heat
exchanger and a diverter valve & (plate type) water-water heat
exchanger for DHW.

The Junior has no diverter valve or plate exchanger, but both primary
and DHW are heated in the gas-water exchanger assembly. Someone (Ed?)
said Ferrolis are like this too.

Some Ravenheats are like this, but being crap they also use a 3-way valve.