Thanks for helping me with this.
WB certainly seem to come highly recommended, but I have to say their website / comparison tools are pretty poor compared to other manufacturer websites I have looked at.
Anyway - back to the topic in hand.
It all depends how many radiators you have, bathrooms and the size of boiler to fit a certain size in a cupboard
I have 11 radiators in all (2 of them are fairly small).
The boiler will be going in the garage, so the extra size of the CDi is not a problem, given that it isn't that much bigger.
get the cdi
with frost protection
AND with digital display you can see what temperature you are setting hot water at tap too.. should be 47
ideally so you cant scold you or the kids, cant waste gas by having it hotter than you need........... no guessing
I thought the 30 Si had frost protection. As its going in the garage I certainly want that feature. Can you show me where this is documented please...
Digital display of temperature sounds pretty useful too, so that certainly adds to the pro's of the CDi.
Not many people realise the 30Si will only put out 24kw's on the ch and 30kw's for the hw. The 30 cdi is 30kw for both ch and hw.
Thanks for pointing that out.
Will I see much difference with only 11 radiators? I assume the rad's will heat up quicker with the 30kw?
I think people don't realise this as the WB website / literature doesn't exactly spell this out... This is certainly an area WB could improve on anyway.
The Si is a fine little boiler and will fit where a CDI doesn't... The CDi is a little better and therefore costs a little more. If everything was left to the Germans we would have the R30HE, a very good boiler but very inefficient in its use of space.
Sounds to me like the Si has been made to accommodate the shrinking UK house