Another "which boiler" question

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I am getting the house plumbed at the moment and need to make a choice on boiler unit.

I have completed the Heat Engineer survey and it shows that 13.54KW is the output required (as below). I was surprised it was this low but i am no expert so am being guided by this figure.
upload_2021-12-2_12-24-34.png


The boiler will power the water, 5nr radiators upstairs and UFH downstairs (100m2). I would like to pair it with the nest controls.

I was looking at the Worcester Bosch Greenstar 4000 either in 15Kw or 18Kw. It is fairly compact and the reviews online are very positive about the unit but i know there are lots of professionals on here that don't like the brand. Taking the cost of the units out of it is there a considerably better option or is this a decent selection? I know my old boiler engineer used to favor Valiant.
 
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CBW

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You can get good and bad in everything, no matter the cost. Talk it through with your installer, and great if it supports opentherm technology.
 
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