Hi Mark
Modulation rates are an important consideration for smaller residences because as with your place which perhaps has three possibly four rooms it probably only needs between 4 and 8 kw to heat which is why originally wanting to install such a large rated boiler wasn't appropriate. An oversized boiler unable to modulate low enough will short cycle repeatedly by cutting on and off, unable to condense, run poorly and inefficiently shortening it's working life etc.
Bare this in mind, every heating engineer has their particular favorite but I think 200-W takes some beating for a number of reasons even though it is costlier than most. If however you intend to install any other large rated boiler besides the 200-W you should probably try and do some heat loss calculations for your flat so you know what the boilers minimum heating output should be.
The 200-W doesn't have a thermostatic shower mode as such but you'll be able to change the HW output temperature easily enough, your commissioning engineer will set or change your parameters as necessary. I think we were all trying to mention boilers with high HW output rates but the 111W is a storage combi like the 938 so would really suit a larger place with more than one bathroom and it doesn't modulate down as well (6:1) compared to the the 200-W (17:1). If you can afford it I wouldn't hesitate, with properly utilised weather comp it's one of the most if not the most efficient boilers out there and that will also be reflected in your running costs.
