On Sun, 08 Jan 2006 10:55:03 +0000, Rick Bowlby wrote:
On Sat, 7 Jan 2006 at 20:17:12, Ed Sirett
wrote:
On Sat, 07 Jan 2006 12:14:49 +0000, Rick Bowlby wrote:
1) With condensing boilers is it still important to get the 'right' size
or might there be benefit in over-sizing a little?
1) Yes, see BoilerChoice FAQ (this is quite new so you may have missed it).
Which is 'yes'?! Actually I had read the FAQ, which was helpful -
"Modern boilers can adjust their output power over a range
automatically, therefore over-sizing is less of a sin that it used to
be, nevertheless getting this right will save some gas". However I do
want to ensure that there is a decent HW flow rate. Heatloss manager
reckons I need a 25kW boiler for heating, so I was thinking of going up
to 30-35 to be on the safe side with HW.
Seriously. That's a gross over estimate of the HW requirements when
combined with a cylinder/thermal store. You'd only need that sort of HW
if you have a stack of people (12+) people living at your place.
28-30kW (load of models around that size) would be quite enough.
However you should allow 40 litres of stored HW/person.
--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at
http://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
Choosing a Boiler FAQ
http://www.makewrite.demon.co.uk/BoilerChoice.html