Grant or Worcester Oil Boiler

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Which make would people reccomend? I see there are old post of the same question but I thought it may be worth asking an up to date opinion. We're thinking either Worcester Heatslave 2 18/25 or Grant Vortex pro 26. I understand that Worcester after care is far better.

I wonder about the EV however as the WB is 12L and the Grant is 24L. We have 13 rads and kitch/diner UFH. The installer says 12L is fine
 
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My Worcester Heatslave seems to be a collection of parts from many manufacturers, so not sure how different other makes would be? I am told new oil boilers are condensing, however it seems oil can't vary the output in the same way as gas, so too big may be more of a problem than too small.
 
I was in this exact situation a few months ago.
I needed my ancient open vented system changed to a modern combi.
Local Worcester installers slated Grant, saying they were crap.
Local Grant installers slated Worcester, saying they were crap! No further forward here then.
Anyway, a great local installer recommended a Worcester so in went a Heatslave 2 18/25 combi. 7 year warranty, complete with a filter. I pay around £13 per month for service and upkeep of warranty.
Early days I know but all's good and the installation was superb! Lets see how things go.
John :)
 
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Navien LCB700. Stainless steel heat exchanger, two stage burner, OpenTherm, and a 10 year warranty
I googled it and it looks interesting. I'll ask the installer. Any complications in having it serviced?
 
We are Grant registered installer's average around 2 a week very few problems
In the past 5 years have taken out 2 leaking Grant's both over 12 years old .
In same period taken out a leaking worcester nearly every week some not 4 years old.
Picture of 5 year old worcester found leaking 6 weeks out of warranty installed with worcester filter correctly serviced customer told where to go by worcester as its out of warranty !
 

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We are Grant registered installer's average around 2 a week very few problems
In the past 5 years have taken out 2 leaking Grant's both over 12 years old .
In same period taken out a leaking worcester nearly every week some not 4 years old.
Picture of 5 year old worcester found leaking 6 weeks out of warranty installed with worcester filter correctly serviced customer told where to go by worcester as its out of warranty !
That does not look good. I am veering towards the Grant

I am also looking at the EV as previous service engineers have said the 24L is too small for my house, which the Grant has but the WB is a 12L EV. WB manual says 180L at 0.5bar in the system, including water in the boiler. If I am reading it right, Grant says 105L in the system excl. the boiler, which I think is 48.5L. We have 13 rad and kitch/diner UFH. Included in the 13 are 3 large 2-column rads that total 45L alone.

I think I must be reading the manuals wrong.

I have been given bad advice from engineers in the past so I am trying to be as certain as possible
 

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If your pushing anywhere near the capacity of built in expansion vessel I would be fitting a extra one.
Grant do make a 26kw combi that's narrower than the standard one expansion vessel is fitted elsewhere wherever you can fit it .
We have used that one with larger than standard expansion vessel to get round problem you have.
 

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