"Ed Sirett" wrote in message
news
On Fri, 30 Sep 2005 22:56:03 +0100, Jimbo wrote:


My plumber has recommended a Worcester-Bosch Greenstar 40 CDi combi
condensing boiler for our biggish 4 bed home. Does anybody have any
experience with this boiler? The spec is impressive but what about
reliability? Also what price should you expect to pay for this boiler?
Does anyone know the best(cheapest) source for this boiler?
Thanks for any help you can give.
Cheers

The make is well regarded.
The 40kW (or thereabouts) is a huge gas rate and will require 28mm
gas pipework unless the meter is underneath the boiler.
It will produce a respectable flow of HW.

The minimum output of this boiler is likely to be around 10-15kW which is
probably more than is needed for your house heating except in
exceptionally cold weather. This means you will loose a bit of efficiency
on the heating side for the convenience of having such a good HW
performance. You might therefore consider the next size down as more
suitable.

You size combis by the DHW flowrate. The W-B is 16 litres/min, so the next
size down will give less than this - not wise. I would go for an Alpha
CD50 (5 year guarantee), which is about 19-10 litres/min flowrate and
modulates the CH output from 7kW to 30kW.