Worcester 3.5 and 400 Hi Flow.

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These two boiler generally look similar!

Can anyone identify the main difference between these two models?

Also which years were they each manufactured?

Tony
 
Without going to indepth the hydraulic assembly are totally different.

Not sure what you need to know.
 
Yes, I did get that thanks but found the exploded diagrams quite difficult to follow.

But its not that important but for me who just repairs the odd one or two a year they looked quite similar.

I am replacing a 400 soon but trying to keep a 3.5 going! Its just that the lady with the 3.5 does not have the money to replace it.

Worcester withdrew the insurance cover saying they were too old and not all the parts are available. She did get their local engineer out privately until she heard of me from someone whose boiler I had fixed.

Tony
 

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