Worcester Greenstar 8000 Style 50kW versus Viessmann Vitodens 111-W 35kW Storage Combination Boiler

Shaya

I would be grateful if I could have some details about both of these boilers.
so I was thinking of a point system from 0-10 on the followings and any details you could share I would be most grateful. 
1.Built quality 2.durability 3.customer service  4.ease of servicing 5.user interface
I live in a 5 bed house with 3 bathrooms with about 20 radiators and I narrow down my choices to these two boilers , I prefer the combi because these new ones seem to be sufficient for big house and remove the need of water tank storage which I do not have the space for it. 
1.Worcester Greenstar 8000 Style 50kW.   I choose this one as most installers can do it with ease, it seems this range have improved in terms of design in case anything goes wrong and it has 18 l/m flow rate which is very important for me for a big house, comes with at least 10 years warranty and seem to have easy enough interface. but its very new to the market and there aren't many reviews on them 
2.Viessmann Vitodens 111-W 35kW Storage Combination Boiler
A whole new design a combi boiler that also have a storage so I can imagine it would be something between system and combi, I believe their built quality is better than worcester as they are german, but I think if anything goes wrong they are more expensive to fix, this one also has 18 l/m.   


If you aren't too board already with my question I was also looking into greenstore lecp heat pumps or greenstore lecp heat pump.  
Is the heat pump provide enough flow rate? can I have a combi for showers and heat pump for radiators, are they better than combi? can they replace combi boilers? 
what are the cons and pros? 

Shaya

Also I am aware the Vissmann have stainless steel heat exchanger I forgot to mention 

Nile

Hi, we move threads if we think they’ll get more help elsewhere (please read the forum rule) so this post/thread has been moved to another board. If you have any questions about this policy please email forumteam@moneysavingexpert.com.

I’ve moved your thread from the ‘I wanna’ to the ‘In my home’ board’, where it is better suited.

Regards

Nile

BUFF

Shaya said:

2.Viessmann Vitodens 111-W 35kW Storage Combination Boiler
A whole new design a combi boiler that also have a storage so I can imagine it would be something between system and combi, I believe their built quality is better than worcester as they are german, but I think if anything goes wrong they are more expensive to fix, this one also has 18 l/m.   

This isn't really true as storage combis have been out for years - my Worcester Highflow CDi is 12 years old & it replaced a previous Highflow installed in the 90s. The Highflow is floorstanding (which suits my installation better than wall-mounted) but my mother had a wall-mounted Alpha storage combi installed 10 years ago. https://www.worcester-bosch.co.uk/products/boilers/directory/greenstar-cdi-highflow
 The advantages of a storage combi are that it minimises the length of time between you turning the tap on & hot water arriving at the tap plus higher flow rates (pure combis take a while to go from cold to producing usably hot water).A Highflow 550CDi can provide up to 25l/m if your water & gas supply to it are up for the job. Whilst Googling for flow rates I came across this which you may find interesting. https://www.superwarm.co.uk/whats-the-difference-the-worcester-bosch-greenstar-highflow-440cdi-vs-the-550cdi-combi-boiler/
Worcester is a subsidiary of Bosch & mine has been ultra reliable & quiet-running. 
With both Viessman & Bosch you are paying a premium but imo worth it for peace of mind & low maintenance costs. Both are very good makes.
I would recommend installing a smart thermostat/programmer at the same time allowing for weather & load compensation.

knightstyle

Just make sure the installer is registered with the manufacturer or you only get a 5 year guarantee.